NSLookup resolves a hostname into its DNS records: the IP address behind a domain, the mail servers that accept its email, its authoritative name servers, its aliases, and any verification strings in TXT records. It is the fundamental diagnostic for DNS propagation, mail delivery issues, and domain troubleshooting.
Enter a domain and submit. Our server queries the authoritative name servers and streams the raw response back.
Common record types
- A — IPv4 address. Where example.com points to.
- AAAA — IPv6 address.
- MX — mail servers for the domain, with priority.
- NS — authoritative name servers.
- CNAME — alias pointing to another hostname.
- TXT — arbitrary text; used for SPF, DKIM, domain verification.
FAQ
What's the difference between A and AAAA? A records hold IPv4 addresses (four numbers 0–255), AAAA records hold IPv6 addresses (eight groups of hex digits). A site can have both.
Why does my MX query return nothing? The domain may have no mail configuration, or the record uses a different TLD. Check the parent domain or the registrar configuration.
Is NSLookup real-time? It queries live DNS servers, but TTL caching can make recent changes invisible for minutes to hours.