DNS tools

Check PTR hostnames, passive DNS domains and CNAME resolution chains.

Choose the right DNS lookup

Use PTR lookup, reverse IP domain discovery or CNAME chain lookup for different questions. Select the mode, then enter an IP or domain; these results are not interchangeable.

Two examples, explainedIllustrative · not live results

IP to reverse hostnamePTR

Example IP: 192.0.2.10
Hypothetical PTR record: host.example.com

Domain to aliasCNAME

Example domain: www.example.com
Hypothetical alias target: edge.example.net

Different recordsPTR, associated domains and CNAME answer different questions; these are not actual records.

Common questions

Why can a working website have no PTR record?

Web access normally depends on A or AAAA records. PTR is separate, is not required for browsing and is not created automatically.

Is “no records” the same as an unavailable source?

No. No records means the query returned no matching records; an unavailable source means the lookup could not currently be verified.

Does reverse IP find every hosted website?

No. Coverage, collection time and shared hosting affect results. Missing domains may still exist, and association does not prove ownership.

Does a PTR hostname prove identity?

Not by itself. The address operator sets PTR, which can be stale or inconsistent with forward DNS. Cross-check forward records, ASN and other evidence.

Does a lower TTL make a site faster?

No. TTL controls how long a record can be cached, not connection or page-load time. Lower values allow earlier re-querying and can increase DNS traffic.

How is this different from a DNS leak test?

This page looks up DNS records for domains and IPs. A leak test checks which recursive resolvers your device actually uses; find it under Environment checks.