NS Lookup — Check Nameservers
Enter a domain to check its authoritative nameservers, TTL values, and available glue IP addresses.
How does NS Lookup work?
The tool queries the domain’s NS records and evaluates the last response in the DNS resolution.
- Enter the domain without a protocol or path.
- The DNS resolution follows referrals to the responsible nameserver.
- The NS records are listed with their TTL and any available IPv4 or IPv6 glue addresses.
Nameserver check FAQ
What are nameservers?
Nameservers are the authoritative DNS servers for a domain. They provide definitive DNS records and tell resolvers, for example, which IP address or mail server belongs to that domain.
Why should I check nameservers?
An NS lookup helps identify delegation and configuration errors. You can quickly confirm whether the expected nameservers are published and whether available glue addresses match them.
How long do NS changes take to propagate?
DNS resolvers may cache old NS records until their TTL expires. Depending on the TTL, registrar, and registry, a change can take several hours and occasionally longer to become visible everywhere.
How is this different from DNS Trace?
NS Lookup focuses on nameservers and presents them in a compact terminal view. For every resolution step and additional record types, use the complete DNS resolution shown by DNS Trace.
How is this different from the nslookup command?
The Unix nslookup command resolves A records by default. It shows nameservers only when you add -type=NS. That is exactly the NS query this tool automates, presenting the response with TTL and glue data in an easy-to-read format.