Tools
Everything you can look up
Each lookup answers 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
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
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
SPF Checker
Validate the record that says which servers may send a domain's email, following every include it pulls in.
- Whether it stays under 10 DNS lookups
- Syntax errors receivers would reject
- Settings that let anyone send as you
DKIM Checker
Check the keys receivers use to verify a domain's signed email, at common selectors or the one you name.
- Keys too short to be trusted
- Revoked keys and dead delegations
- Records receivers would discard
DMARC Checker
See what a domain tells receivers to do with mail that fails SPF and DKIM, and where the reports go.
- Whether spoofed mail is refused
- Which policy a subdomain inherits
- Report addresses that never get reports