Nslookup
The four lookup tools: DNS records for a domain, reverse lookup from an IP address, WHOIS registration details, and the MCP server for DNS queries

Tools

Everything you can look up

Four lookups, each answering a different question about a domain or an address. All of them query live nameservers and registries, no account needed.

Domain DNS Lookup

Query a domain against a real resolver and read back every record it publishes: A, AAAA, CNAME, MX, TXT, NS and SOA.

  • Where a domain points
  • Which mail servers accept its email
  • What SPF and DKIM it publishes
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Reverse DNS Lookup

Start from an IP address instead of a name. The PTR record tells you which hostname the address claims.

  • Who owns an address in your logs
  • Whether a mail server has valid reverse DNS
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WHOIS Lookup

Registration details straight from the registry: registrar, creation and expiry dates, domain status and nameservers.

  • When a domain expires
  • Who it is registered through
  • Whether it is locked or pending delete
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Beyond the lookups

AI & API Connect an AI assistant to live DNS over the Model Context Protocol. Learning Center What each record type does, and when you would reach for it.