DNS Tools
NS Record Lookup
Look up a domain's NS records to see which nameservers manage its DNS.
Enter a domain to look up its NS records.
JustChecker tracks your DNS records continuously and alerts you the moment something changes.
Frequently Asked Questions
NS ("Nameserver") records specify which DNS servers are authoritative for a domain - they're the servers the entire internet ultimately asks when resolving any other record type (A, MX, TXT, etc.) for that domain.
The registrar stores the "delegation" NS records (which the parent TLD points to), while a domain's own DNS zone can independently list its own NS records - these should normally match, and a mismatch is worth investigating.
Multiple nameservers provide redundancy - if one is temporarily unreachable, resolvers automatically fall back to another, so the domain keeps resolving even if a single DNS provider has an outage.
NS record changes at the registrar level are themselves subject to propagation delay (often up to 24-48 hours industry-wide), separate from the TTL of any individual record within the zone itself.
If ALL listed nameservers are unreachable, the entire domain stops resolving - no website, no email, nothing - which is why NS records are one of the most critical, foundational pieces of a domain's DNS setup.
Yes, and this is extremely common - your registrar is only where you bought the domain; NS records can point to any DNS hosting provider you choose, entirely independent of where the domain itself is registered.
There can be a brief transition window while the change propagates - the safest approach is ensuring the new nameservers have the exact same records configured before switching, so nothing is missing during propagation.