This topic describes the features of Alibaba Cloud Public DNS.
Overall architecture diagram of public DNS
Features
Networkwide basic DNS resolution
Provides basic DNS resolution for all domain names on the Internet. Public DNS can resolve domain names that are registered with Alibaba Cloud or a third-party domain name registrar. It also supports DNS resolution by using DNS over HTTPS (DoH) and DNS over TLS (DoT) protocols.
Accelerated domain name access
Allows terminals to cache DNS records. This accelerates domain name access from terminals.
Reduces the number of recursive DNS lookups and allows DNS requests to be directly sent to an authoritative DNS server. This accelerates domain name access.
Updates the resolution results rapidly. The recursive DNS server of Public DNS and the authoritative DNS server of Alibaba Cloud DNS update the resolution results at the same time to make the resolution results take effect in seconds.
User privacy protection
Supports the DoT and DoH protocols which are both developed based on Transport Layer Security (TLS). TLS is used for secure communications between users and servers of Public DNS. This ensures user privacy and prevents data leakage.
Supports the TLS 1.2, TLS 1.3, HTTP/1.1, and HTTP/2 protocols.
Hijacking prevention
Bypasses local DNS servers of Internet service providers (ISPs) to prevent domain hijacking.
Supports anti-DDoS capabilities, which prevents terminals from being affected by distributed denial of service (DDoS) attacks on DNS servers.
Intelligent scheduling
Intelligently determines the source of a visitor and returns the IP address of the nearest resolution line based on the source.
Supports EDNS Client Subnet (ECS) to ensure precise scheduling.
Achieves switchovers in seconds when a node fails, which ensures network stability.
Support for IPv6
Supports both IPv4 and IPv6 addresses.
Rich report logs
Allows registered users of Alibaba Cloud to obtain access log reports of historical domain names from Public DNS.
Allows users to query the number of DNS requests and rankings of domain names and subdomains.