Reverse DNS Lookup

What this checks

• PTR hostnames returned for the entered public IPv4 or IPv6 address.
• Forward A and AAAA records for each PTR hostname, filtered to global IP literals only.
• Whether any PTR hostname resolves back to the exact IP address you entered.

How to interpret results

• A forward match means at least one PTR hostname also resolves back to the same public IP address.
• No PTR hostname is a stable empty result, not necessarily a DNS problem.
• PTR hostnames without a forward match can still be informative, but they deserve extra scrutiny.

Common issues

• Reverse DNS depends on the IP owner's DNS delegation; many addresses intentionally have no PTR record.
• Forward verification excludes private, link-local, documentation, and other non-global addresses from the comparison.

Privacy note

This tool sends the entered public IP address to the site's server resolver only to perform reverse and forward DNS checks.

Frequently Asked Questions

What does reverse DNS lookup show?

Reverse DNS lookup returns PTR hostnames for an IP address, then checks whether those hostnames resolve back to the same public IP.

Why can a public IP have no PTR hostname?

Many public IP addresses do not publish PTR records, and that is a normal result rather than a failure.