If you want to use custom Domain Name System (DNS) servers to resolve your domain name, you must first create your own DNS servers. This topic provides answers to commonly asked questions about custom DNS servers.

What is a custom DNS server?

A custom DNS server is a user-created DNS server and provides the DNS resolution service. Professional technical skills are required to create custom DNS servers. If you do not have such skills, we recommend that you use the DNS service provided by your DNS service provider.

What are the naming rules for a DNS server?

The naming rules for a DNS server are as follows:
  • The name of a DNS server can contain only letters, digits, periods (.), and hyphens (-). The name is not case sensitive and cannot start or end with a period (.) or hyphen (-).
  • It cannot contain spaces or the following special characters: exclamation points (!), dollar signs ($), ampersands (&), and question marks (?).
  • The name of a DNS server can be up to 80 characters in length.

We recommend that you include dns or ns in your server name, such as dns1.yourdomain.com and dns2.yourdomain.com.

How many DNS servers can I create at most?

You can create a maximum of 13 DNS servers. The actual number of DNS servers that you can create is determined by the domain name registry.

Do custom DNS servers support IPv6 addresses?

Yes, custom DNS servers support IPv6 addresses.

How many IP addresses can I configure for a DNS server?

You can configure 1 to 13 IP addresses for a DNS server. The actual number of IP addresses that you can configure for a DNS server is determined by the domain name registry.

Can I change or delete a server name?

No, you cannot change or delete a server name.

Can I change or delete the IP addresses of a DNS server?

Yes, you can change or delete the IP addresses of a DNS server. However, at least one IP address must be retained.

Does a custom DNS server take effect immediately after it is created?

No, it takes several minutes for a custom DNS server to take effect after it is created.