How to use NS Lookup (Nameserver Lookup)
The NS Lookup retrieves the authoritative name servers for a domain — the DNS servers that hold the master copy of its records and answer queries about it. The name servers are where a domain’s DNS truly lives, so identifying them is the starting point for any DNS troubleshooting, for confirming a domain points at the right DNS provider, or for verifying that a migration between providers has completed. Use this tool to see exactly which name servers a domain delegates to and to check that they agree with what you configured at your registrar.
- Enter the domain whose name servers you want to find.
- Click Lookup to query its NS records.
- Read the list of authoritative name servers returned.
- Confirm they match your intended DNS provider.
- During a migration, watch for the new servers to appear.
Authoritative name servers explained
A domain’s NS records, set at the registrar, delegate authority to specific name servers that hold the zone’s real records — the A, MX, TXT and other entries that make the domain work. When any resolver needs an answer about the domain, it ultimately asks one of these authoritative servers. Domains list at least two for redundancy, often on separate networks, so the domain keeps working if one fails. Confirming the NS records point at the right provider is the first thing to check when DNS behaves unexpectedly.
Name servers during a migration
Changing DNS providers means updating the NS records at your registrar to the new provider’s servers. Because the old records are cached around the internet, the change does not take effect everywhere at once; for a period some resolvers still ask the old servers while others ask the new. The safe practice is to recreate all your records at the new provider before switching the NS records, so whichever server a resolver reaches returns correct answers. This lookup lets you watch the delegation flip from old to new as the change propagates.
| Aspect | Detail |
|---|---|
| Where set | At the registrar |
| Minimum count | Two, for redundancy |
| Points to | The authoritative DNS servers |
Glossary
- NS record
- A DNS record delegating a domain to its authoritative name servers.
- Authoritative name server
- A server holding the master copy of a domain’s DNS records.
- Delegation
- Assigning responsibility for a domain’s DNS to specific name servers.
- Registrar
- Where NS records are set for a domain.
- Zone
- The collection of DNS records an authoritative server holds for a domain.
Related reading
Frequently Asked Questions
Why use NS Lookup (Nameserver Lookup)?
- Retrieve a domain's authoritative name servers and verify they match the intended provider
- Confirm a DNS provider migration has completed by watching the NS records change
- Identify which DNS hosting service is authoritative for any third-party domain
- Diagnose resolution problems by locating where the zone authority lives
Common use cases
- Verify name servers have updated at the registrar after a DNS migration
- Confirm a domain is delegated to the correct managed DNS provider before going live
- Investigate unexpected DNS behaviour by identifying the authoritative servers to query
- Check NS records are consistent across multiple queries during a provider switch
- Find the name servers for a domain before manually querying its authoritative servers
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