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Reverse DNS Check

Whether an address's name resolves back to it, and who holds the range.

Either family. Private and loopback addresses have no public reverse DNS, so they are refused rather than looked up.

Reverse DNS for 192.0.43.8

Name does not resolve

192.0.43.8 says it is 43-8.any.icann.org, but 43-8.any.icann.org has no address record at all. The reverse half is published and the forward half is missing, so a receiver checking both will still refuse. The name needs an A or AAAA record pointing back here.

PTR record43-8.any.icann.org
That name resolves toNot retrieved
The zone that holds it43.0.192.in-addr.arpa

Who holds the range

Registered toICANN
Range192.0.32.0/20
Abuse contact[email protected]

From the regional registry over RDAP. This is where a complaint about traffic from this address goes; it is the network holding it, which may not be whoever is using it.

Two steps, not one. Most checkers print the PTR record and stop, but a receiver worth passing checks that the name resolves back to the address it came from -- forward-confirmed reverse DNS. The two halves are published by different people and they come apart often: the default example is a real address at ICANN whose name has no address record. Nothing here needs port 53 or port 43; the records come over DoH and the registry over HTTPS.