NS 记录
Lists the authoritative name servers for a zone.
NS 记录是什么？
NS records tell the DNS system which servers are responsible for a given domain. They appear at the apex of a zone and are also delegated from the parent zone (the TLD operator). Recursive resolvers use NS to find which IPs to ask for further records.
区域文件示例
example.com. 86400 IN NS ns1.example.com. example.com. 86400 IN NS ns2.example.com.
常见用例
- ▸Change DNS providers — update the NS records at the registrar.
- ▸Delegate a subdomain to a different DNS provider.
- ▸Split-horizon / private DNS by changing internal NS targets.
- ▸Diagnose propagation: query NS records via different resolvers (1.1.1.1, 8.8.8.8, 9.9.9.9) to see who has the new set.
常见坑
The NS set at the parent zone must match the apex NS set inside the child zone. Mismatches ("lame delegation") cause intermittent failures hard to debug.