NS Lookup

The NS Lookup tool returns the authoritative nameservers for any domain. Nameservers are the DNS servers responsible for publishing a zone — every DNS lookup for the domain ultimately traces back to them. Knowing the current NS records for a domain is essential when you migrate DNS hosts, delegate a subdomain, debug propagation issues, or audit which provider actually controls a zone.

Nameservers are set at the domain registrar, not the DNS host. When you point ns1.example.com and ns2.example.com at a new provider, the change ripples down from the parent TLD servers to recursive resolvers around the world. Because NS record changes at the registry level are cached by many resolvers for hours, an NS Lookup done right after a change often shows the old servers — which is why it pays to check propagation with our global checker as well.

This tool is heavily used by hosting migration engineers, domain admins, security researchers investigating suspicious infrastructure, and anyone building an operational runbook for zone changes. Combine NS Lookup with a WHOIS query to see the registrar of record, and with an SOA lookup to identify the primary nameserver of the current zone.