DNS Lookup Tools
Query any public DNS record type, check whether a change has propagated across major public resolvers, validate DNSSEC, and look up WHOIS and reverse DNS.
Each lookup explains what the record does and flags common mistakes, such as an MX record that points at a CNAME, a missing CAA record, or a broken DNSSEC chain.
15 free dns tools
- A RecordIPv4 address for a domain
- AAAA RecordIPv6 address for a domain
- CNAME RecordDomain alias lookup
- MX RecordMail servers for a domain
- NS RecordAuthoritative nameservers
- TXT RecordArbitrary text records
- SOA RecordZone authority details
- CAA RecordAuthorized certificate issuers
- Propagation CheckerCheck a record across global resolvers
- WHOIS LookupRegistrar, creation/expiry dates, and nameservers
- DNSSEC CheckerCheck DNSSEC signing and chain-of-trust validation
- RDNS LookupReverse DNS (PTR) lookup for an IP address
- SRV RecordService records (priority, weight, port, target)
- DS RecordDNSSEC delegation signer records at the parent zone
- Zone Transfer TestCheck whether nameservers allow an AXFR transfer
Guides: Network Protocols
- How NAT Actually WorksSource NAT, destination NAT, and PAT/masquerade; the conntrack table that makes it stateful; hairpin NAT, port exhaustion, and why NAT breaks some protocols.
Checking a whole domain? The Super Scanner runs every DNS, email, website and security check at once and gives one score.