What is a nameserver lookup?

It shows nameservers from domain registration data alongside live DNS NS records so you can compare delegation.

Why compare registry and DNS nameservers?

Registry delegation tells the parent zone which NS to refer queries to. Live NS shows what resolvers actually receive. They should match.

You may be mid-migration, have a registrar typo, or stale glue. Align registrar settings with your authoritative DNS host.

Use this tool — it lists both registration delegation and live NS answers in one results panel.

NS Lookup shows only live DNS NS records. Nameserver Lookup adds registry delegation for side-by-side comparison.

WHOIS shows broad registration fields. This page focuses on nameserver delegation plus live NS verification.

Registry updates can take minutes to hours. NS TTL and cache lifetimes add additional delay worldwide.

You must export or recreate zone records on the new DNS host before pointing NS, or services will break.

At least two on distinct networks is recommended for resilience.

The registry may redact data, or the domain may be in an unusual state. Live NS may still answer if delegation exists elsewhere.

Indirectly — wrong NS means wrong MX and TXT answers, breaking mail flow and authentication.

Yes. IP Checker Online offers this combined lookup at no cost.

After registrar NS edits, DNS host onboarding, acquisitions, and when any DNS record looks stale globally.

When NS hostnames live inside the child zone, the parent publishes glue A/AAAA to bootstrap resolution.

No. Always verify live NS — that is what recursive resolvers use after delegation is published.

DNS Tools

Compare registry nameserver delegation with live DNS NS answers.