Nameserver Lookup
Look up the authoritative nameservers for any domain.
Enter a domain name to find its authoritative nameservers.
What Are Nameservers?
Nameservers (NS records) are the DNS servers that are authoritative for a domain — they hold the official DNS zone file and respond to queries about that domain's records. When you type a domain into your browser, the DNS resolver first finds the domain's nameservers, then queries those servers for the specific record it needs (usually an A record for the IP address). Nameservers are the foundation of how DNS works: they're the "source of truth" for a domain's entire DNS configuration.
Why Nameservers Matter
Knowing a domain's nameservers tells you who controls its DNS. This is critical information when troubleshooting DNS issues, migrating domains between hosting providers, or verifying that a domain change has taken effect. If you've just switched hosting and updated your nameservers at your registrar, a nameserver lookup confirms whether the change has propagated. Nameservers also reveal the DNS provider — for example, if you see ns1.cloudflare.com, you know the domain uses Cloudflare for DNS.
Redundancy and Best Practices
Every domain should have at least two nameservers for redundancy. If one nameserver goes down, the other can still answer queries, keeping the domain accessible. Most DNS providers assign two to four nameservers, often distributed across different networks and geographic locations. Enterprise setups may use even more. This tool resolves each nameserver to its IPv4 and IPv6 addresses, so you can verify that the nameservers are actually reachable and properly configured.
Common Use Cases
Use this tool to verify nameserver configuration after a domain migration, identify which DNS provider a domain uses, troubleshoot DNS resolution failures, check TTL values on NS records, and confirm that all nameservers are resolving to valid IP addresses.