Alibaba Cloud DNS:Add a DNS record

Limits

• Public IPv4 address for the target server is required, such as 192.0.2.1.

  • Alibaba Cloud ECS: The public IP address can be found in Alibaba Cloud ECS console.

  • Other Providers: Obtain the public IP address from your service provider.

• Conflict Rules: For any host record other than @, an A record cannot coexist with an NS, CNAME, or URL record if they share the same host record and resolution line. To resolve a conflict error, either delete the conflicting record or modify the host record. For more information, see DNS record conflict rules.

Configuration

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	The required format for the Record Value depends on the selected type.	Select A to map the domain name to an IPv4 address.
   Host Record	The prefix of a subdomain.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	Defines how DNS responds when multiple record values exist for the same host. Polling (Round Robin): Returns all configured record values in response to a query. The client's local DNS resolver selects one at random, distributing traffic evenly. Weight: Distributes traffic among record values based on their weights. For more, see Weight Configuration.	Polling
   Record Values	This is typically the public IPv4 address of the web server. You can add multiple addresses. If you select Weight for the Record Values Load Strategy, a Weight must be specified for each record value to control the traffic distribution ratio.	Alibaba Cloud ECS: Find the public IP address in the ECS console. Other providers: Get the public IP address from your service provider.

   Example

   

FAQ

• Does Alibaba Cloud DNS support port resolution?

• How do I set up DNS resolution in Alibaba Cloud DNS for a domain not registered with Alibaba Cloud?

• A and AAAA records

A canonical name (CNAME) record points a domain name to another domain name, which then provides the IP address. CNAME records are used for services such as CDN, enterprise email, and Global Traffic Manager.

Limits

• Prerequisite: You have a mail server and get the domain address your email service provider.

• Record Conflicts: For any host record other than @, an MX record cannot coexist with an NS, CNAME, or URL record if they share the same host record and resolution line. If a conflict error occurs, either delete the conflicting record or modify the host record. For more information, see Resolve record conflict rules.

Configuration

The following example shows how to configure email records for Alibaba Cloud Mail:

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	The required record value varies based on the selected record type.	Select MX from the drop-down list. An MX record is used by email systems to locate the mail server address for a domain.
   Hostname	The prefix of a domain name.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	Only the Polling method is supported for MX records. When this method is used for A, AAAA, NS, MX, and TXT records, Alibaba Cloud DNS returns all matching records, and the client's local DNS resolver selects one.	Polling
   Record Values	Record value: The domain name of the mail server retrieved from your mailbox provider, such as mx1.qiye.aliyun.com. MX Priority: A lower value indicates a higher priority. For example, a server with priority 5 (mx1.qiye.aliyun.com) is tried before a server with priority 10 (mx2.qiye.aliyun.com).	Example: aliyundoc.com 5. Important A complete email setup may also require CNAME and TXT records. Get the full set of required DNS records from your mailbox provider. If your mailbox provider is Alibaba Cloud Mail, see Add email domain resolution.

   Example

   

FAQ

FAQ about MX records

Limits

• Get the IPv6 address of the server that you want to point your domain name to in advance. Example: ff03:0:0:0:0:0:0:c1.

• If the host record is not @, an AAAA record conflicts with an NS, CNAME, or URL record if they have the same host record and resolution line. If a conflict is reported when you add an AAAA record, you can resolve the conflict by deleting the conflicting record or modifying the host record. For more information, see DNS Record Conflict Rules.

Configuration

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	The record value that you must specify depends on the record type.	Select AAAA from the drop-down list. This record type maps a domain name to an IPv6 address, which is typically the IPv6 address of a web server. For example, ff03:0:0:0:0:0:0:c1.
   Hostname	The subdomain prefix.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	Defines how DNS responds when multiple record values exist for the same host. Polling (Round Robin): Returns all configured record values in response to a query. The client's local DNS resolver selects one at random, distributing traffic evenly. Weight: Distributes traffic among record values based on their weights. For more, see Weight Configuration.	Polling
   Record Values	The IPv6 address of the web server. You can add multiple addresses. If you select Weight for the Record Values Load Strategy, a Weight must be specified for each record value to control the traffic distribution ratio.	For example, ff03:0:0:0:0:0:0:c1.

   Example

   

FAQ

FAQ about A and AAAA records

Limits

• For any host record other than @, a TXT record cannot coexist with an NS, CNAME, or URL record on the same resolution line. To resolve a conflict, delete the conflicting record or use a different host record. For more information, see DNS record conflict rules.

• The maximum length of a TXT record value is 8,192 characters.

Configuration

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	The record value that you must specify depends on the record type.	Select TXT from the drop-down list. TXT records are often used for SSL digital certificate verification and SPF records (for anti-spam).
   Hostname	The prefix of the subdomain.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	Only the Polling method can be used to return record values. For A, AAAA, NS, MX, and TXT records, Alibaba Cloud DNS returns all records that match the specified line. The local DNS server then selects one record to return. If the local DNS server returns all matching addresses, the client randomly selects one.	Round Robin
   Record Values	TXT records are commonly used for verification. You can get the record value from your certificate service or email service provider. For example, you may need to add a TXT record for verification when you delegate a subdomain. You can add multiple values. Note We recommend that you remove unnecessary TXT records during routine maintenance. This helps prevent the total length of TXT records for a single subdomain from exceeding the limit. If the limit is exceeded, resolution may fail on some carriers' recursive DNS servers.	Example: 5d597b2c12464a7a8d0dde6b858ce543.

   Example

   

FAQ

FAQ about TXT records

Prerequisites

When you add a URL forwarding record, the domain name is resolved to an Alibaba Cloud forwarding server, which then acts as the forwarding proxy. Alibaba Cloud's URL forwarding servers are deployed in the Chinese mainland. Therefore, you must obtain an ICP filing for the source domain name. The ICP filing does not have to be obtained through Alibaba Cloud. To obtain an ICP filing through Alibaba Cloud, see ICP filing process.

Limits

• The record value for URL forwarding cannot be an IP address.

• The source domain name for URL forwarding cannot contain an underscore (_).

• URL forwarding does not support wildcard DNS resolution.

• The target domain name for URL forwarding cannot be a Chinese domain name.

• The source domain name for URL forwarding supports HTTP but not HTTPS. The target URL can be an HTTP or HTTPS address.

• If the host record is not @, a URL record conflicts with NS, CNAME, A, or AAAA records if they have the same host record and resolution line. If a conflict is reported when you add a URL record, you can resolve the conflict by deleting the conflicting record or modifying the host record. For more information, see DNS Record Conflict Rules.

• URL forwarding is a special feature. Alibaba Cloud DNS does not provide attack prevention for it. If you encounter an attack that triggers blackhole filtering, you cannot use URL forwarding. In this case, you must change the record type for the hostname to A or CNAME.

Configuration method

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	With Explicit URL forwarding, the URL in the browser's address bar changes to the destination URL, and the content of the destination website is displayed. With Implicit URL forwarding, the domain name in the browser's address bar does not change, but the content of the destination website is displayed.	Select Explicit URL or Implicit URL.
   Hostname	This is the prefix of a subdomain.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	Record values are returned using the Polling method only.	Polling
   Record Values	Another website. Note For explicit URL forwarding: This feature supports 301 permanent redirects and 302 temporary redirects. A 301 redirect indicates that the resource at the old URL has been permanently moved and is no longer available. When a search engine scrapes the new content, it also replaces the old URL with the new one. A 302 redirect indicates that the redirection is temporary and the resource at the old URL is still available. The search engine scrapes the new content but retains the old URL.	Example: www.aliyun.com.

   Example

   Explicit URL

   Implicit URL

FAQ

FAQ about URL forwarding

Limits

• You cannot delegate a primary domain name by setting the hostname to @. To delegate a primary domain name to another DNS provider, you must change the DNS server addresses at your domain name registrar. For more information, see Change the DNS servers for a domain name.

• If the host record is not @, an NS record conflicts with other DNS records if they have the same host record and resolution line. If a conflict is reported when you add an NS record, you can resolve the issue by deleting the conflicting record or modifying the host record. For more information, see DNS record conflict rules.

Configuration

1. Add the subdomain to Alibaba Cloud DNS and obtain the DNS server addresses assigned to the Subdomain. For more information, see Subdomain Management.

2. Go to the authoritative DNS server for the primary domain name to modify the DNS records for the subdomain. For example, in Alibaba Cloud DNS, go to the Alibaba Cloud DNS - Public Zone page and click the target domain name to open the DNS Settings page.

3. On the Settings page, click the Add Record button.

4. Fill in the fields.

   Field	Description	Recommended value
   Record Type	To delegate a subdomain to another DNS service provider, you can add an NS record.	Select NS from the drop-down list.
   Hostname	The prefix of the subdomain.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	You can use only the Polling method to retrieve record values. For A, AAAA, NS, MX, and TXT records, Alibaba Cloud DNS returns all record values that match the specified line. The local DNS server then selects a result to return. If the local DNS server returns all available addresses, the client randomly selects one.	Polling
   Record Values	Specifies the domain name of the DNS server to which you are delegating authority. Note DNS service providers typically provide multiple DNS server addresses. You can add multiple NS records with the same hostname (subdomain) but different record values.	For example, ns3.dnspod.net is a DNS server domain name provided by Tencent Cloud DNS.

   Example

Limits

• If the host record is not @, an SRV record conflicts with an NS or CNAME record if they have the same host record and resolution line. If a conflict is reported when you add an SRV record, you can resolve the issue by deleting the conflicting record or modifying the host record. For more information, see DNS Record Conflict Rules.

Configuration

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	An SRV record specifies which server provides a service and includes information such as the address, port, priority, and weight of the service.	Select SRV from the drop-down list. This record type is used to specify the location of servers for a specific service.
   Hostname	The format of the host record is `_service._protocol`.	Example: _sip._tcp
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	Only the Polling method is supported to return DNS records.	Polling
   Record Values	The format of the record value is Priority Weight Port Target host	Example: 0 5 5060 www.cloud-example.com.

   Example

Limits

• If the host record is not @, a CAA record conflicts with an NS or CNAME record if they have the same host record and DNS resolution line. If a conflict is reported when you add a CAA record, you can resolve the issue by deleting the conflicting records or modifying the host record. For more information, see DNS Record Conflict Rules.

Configuration method

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	A CAA record allows a website owner to specify which Certificate Authorities (CAs) are authorized to issue certificates for their domain name. This helps prevent unauthorized third parties from obtaining an SSL/TLS certificate for the domain name from other CAs, which prevents the misissuance of HTTPS certificates and improves website security.	Select CAA from the drop-down list.
   Hostname	Specifies the prefix of a subdomain.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values Load Strategy	Only the Polling method is supported.	Polling
   Record Values	flag: The default value is 0. This value indicates that an issuing CA that does not recognize the tag can ignore the record. tag: The supported values are issue, issuewild, and iodef. issue: Authorizes a specified CA to issue any type of certificate for the domain name. issuewild: Authorizes a specified CA to issue wildcard certificates for the hostname. iodef: Specifies a URL to which a CA can send reports about policy violations. value: The domain name of the CA or the URL for violation notifications. Example: "ca.cloud-example.com". Note: The value must be enclosed in double quotation marks.	Example: 0 issue "ca.cloud-example.com"

   Example

Limits

If the hostname is not @, and the hostname and request source are the same, an SVCB record conflicts with an NS or CNAME record. The alias mode and service mode of an SVCB record also conflict with each other. If a conflict is reported when you add an SVCB record, you can resolve the conflict by deleting the conflicting record or changing the hostname. For more information, see DNS record conflict rules.

Configuration

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	An SVCB record is a service binding record used for service discovery. It provides information about supported protocols and service parameters as a DNS record.	Select SVCB from the drop-down list.
   Hostname	The prefix of the domain name.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Query Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)
   Record Values	Priority: A non-negative integer from 0 to 65535 that specifies the order in which multiple SVCB records are used. A lower value indicates a higher priority. If a service has multiple SVCB records, a client sorts them by priority and attempts to use the record with the highest priority (the smallest value) first. This parameter is similar to the priority parameter of MX records. Note A priority of 0 indicates alias mode, in which service parameters cannot be set. This mode is similar to a CNAME record and can redirect to another service name. A non-zero priority indicates service mode, in which you can define service parameters. Target Domain Name: The domain name of the server to which the client connects. In alias mode (priority 0), the target domain name is another service name for the client to resolve. In service mode, the target domain is typically the hostname that provides the service. The client then resolves this target domain to obtain the IP address of the service. For example, www.example.com. Service Parameters are a set of key-value pairs that define service configuration and required features. These parameters can provide various types of information, such as expected protocol versions, a list of application-layer protocols (such as Application-Layer Protocol Negotiation or ALPN), transport layer security requirements (such as required TLS versions), transport parameters, and IP address hints. Service parameters allow service providers to provide clients with detailed guidelines for accessing services and pre-connection information to optimize connection performance and security. For example: alpn="h2" ipv4hint="223.5.5.5" port="443" ech="MTIzNDU2Nzg=" Note Common service parameters: alpn="h3,h2": Indicates support for HTTP/2 and HTTP/3. ipv4hint="223.5.XX.XX": The IPv4 address of the target domain name. ipv6hint="2400:3200::XX": The IPv6 address of the target domain name. port="443": The port number. ech="MTIzNDU2Nzg=": A Base64-encoded string of the Encrypted Client Hello (ECH) configuration information. mandatory="alpn,port": A list of mandatory parameters. no-default-alpn: Indicates that no default application-layer protocol exists. If this parameter is present, the alpn parameter must also be specified. dohpath="/dns-query{?dns}": The URI template for DNS-over-HTTPS (DoH) access. Separate multiple key-value pairs with spaces. The maximum length is 1,024 characters.

   Example

An HTTPS record is a specialized version of the SVCB record that is used exclusively for describing HTTPS services. HTTPS records typically contain the same types of key-value parameters as SVCB records, but they are interpreted and processed with the assumption that the service protocol is HTTPS.

HTTPS records allow website operators to provide more detailed information about their HTTPS services, including which IP addresses are available and which protocols or service parameters are supported. This ensures that the most appropriate configuration is used when a client connects to the server for the first time, which reduces handshake latency, lowers the probability of connection failures, and enhances user privacy.

Limits

If the hostname is not @, and the hostname and request source are the same, an HTTPS record conflicts with an NS or CNAME record. The alias mode and service mode of an HTTPS record also conflict with each other. If a conflict is reported when you add an HTTPS record, you can resolve the conflict by deleting the conflicting record or changing the hostname.

Configuration method

1. On the Alibaba Cloud DNS - Public Zone page, click the target domain name to navigate to the Settings page.

2. On the Settings page, click the Add Record button.

3. Fill in the fields.

   Field	Description	Recommended value
   Record Type	An HTTPS record is a type of DNS record for HTTPS services. It specifies a secure connection protocol and the optimal service site address to improve the security and reliability of HTTPS access.	Select HTTPS from the drop-down list.
   Host Record	The prefix of a subdomain.	For a top-level domain like www.example.com, enter www. For a subdomain like example.com, enter @. For third-level domain like demo.example.com, enter demo. For test.blog.example.com, enter test.blog.
   Parsed Request Source	Specifies the source of the DNS query to enable geo-routing. The Default line serves as the primary configuration for all regions. For advanced traffic management, configure lines by ISP or region to return different IP addresses based on the location. See Smart resolution and Custom lines for details. Important A Default line is mandatory to ensure resolution for queries that do not match any specific line, preventing resolution failures.	General Use: Keep the Default value. Regional Targeting: To target queries from Beijing and surrounding regions, select China Region_North China. ISP Targeting: To target queries from a specific ISP like China Telecom, select China Telecom.
   Record Collection	Priority: A non-negative integer from 0 to 65535 that specifies the priority of an HTTPS Record. A lower value indicates a higher priority. If a service has multiple HTTPS Records, a client sorts the records by priority and attempts to connect to the record with the highest priority (lowest value) first. This is similar to the priority parameter of an MX record for email services. Note A priority of 0 indicates alias mode. In this mode, service parameters cannot be set. This mode is similar to a CNAME record and directs traffic to another service name. A non-zero priority indicates service mode, in which you can define service parameters. Target Domain Name: The domain name of the server that the client connects to. In an HTTPS Record that uses the Alias pattern (priority 0), the target domain specifies another service name for the client to resolve. In service mode, the target domain name is typically the hostname that provides the service. The client resolves this domain name to obtain the service's IP address. For example, www.example.com. Service Parameters: A set of key-value pairs that define the service configuration and required features. The parameters include information such as the expected protocol version, a list of application-layer protocols (such as ALPN), transport layer security requirements (such as the required TLS version), transport parameters, and IP address hints. Service parameters allow a service provider (SP) to provide clients with detailed guidelines and pre-connection information for accessing the service. This optimizes the connection's performance and security. For example: alpn="h2,h3" ipv4hint="223.5.XX.XX" ipv6hint="2400:3200::XX" port="443" Note Examples of service parameters: alpn="h3,h2": Indicates support for HTTP/2 and HTTP/3. ipv4hint="223.5.XX.XX": The IPv4 address of the target domain name. ipv6hint="2400:3200::XX": The IPv6 address of the target domain name. port="443": The port number. mandatory="alpn,port": A list of mandatory parameters. no-default-alpn: Indicates that there is no default application-layer protocol. If this parameter is present, the `alpn` parameter is required. dohpath="/dns-query{?dns}": The URI template for DNS-over-HTTPS (DoH) access. Separate multiple key-value pairs with spaces. The maximum length is 1,024 characters.	Example: aliyundoc.com.
   TTL	The duration that the record is cached by recursive DNS servers. A lower TTL allows DNS changes to propagate faster. The standard recommendation is 600 seconds (10 minutes). For more, see Configure TTL.	Version Free Version Personal Version Enterprise Ultimate Version Minimum TTL value 600 seconds (10 minutes) 600 seconds (10 minutes) 1 second Maximum TTL value 86400 seconds (24 hours) 86400 seconds (24 hours) 86400 seconds (24 hours)

   Example