DNS Intelligence

Reverse DNS Lookup

Look up the PTR hostname associated with any public IPv4 or IPv6 address. See whether reverse DNS exists, which hostname or hostnames are returned, and how to interpret the result.

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Ready for lookup

Enter a public IPv4 or IPv6 address to query its reverse DNS PTR record.

Understanding reverse DNS

  1. 01

    What is reverse DNS?

    Reverse DNS maps an IP address back to a hostname using a DNS PTR record. It is the opposite direction from a normal forward DNS lookup, where a hostname is resolved to an IP address.

  2. 02

    What is a PTR record?

    A PTR record contains the hostname that the operator responsible for an IP address has assigned for reverse DNS. IPv4 uses the in-addr.arpa reverse namespace, while IPv6 uses ip6.arpa.

  3. 03

    Why does an IP address have no reverse DNS?

    Reverse DNS is optional. An address may be publicly routed and work normally even when no PTR record exists. Missing reverse DNS should not by itself be treated as evidence that an address is unsafe or misconfigured.

  4. 04

    Reverse DNS vs. hostname lookup

    A reverse DNS lookup starts with an IP address and asks for its PTR hostname. A hostname lookup starts with a domain or hostname and asks for its A or AAAA addresses. These are separate DNS operations and do not necessarily produce symmetric results.

Analyst note

A PTR hostname is context, not identity

Reverse DNS naming is controlled by the network responsible for the address. A PTR hostname can provide useful infrastructure context, but it does not prove legal ownership, physical location, user identity, or host safety.

Data provenance

How IPRevealed performs the lookup

Lookup type
Live DNS PTR query for the supplied public IPv4 or IPv6 address.
Resolver path
IPRevealed US1 network probe through the public IPRevealed API.
HTTP cache policy
The public endpoint is served with Cache-Control: no-store.

This tool reports PTR results returned at lookup time. It does not currently perform forward-confirmed reverse DNS (FCrDNS).

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Reference

Frequently asked questions

What does a reverse DNS lookup do?

It queries the PTR record associated with an IP address and returns the hostname or hostnames configured for that address.

Can IPv4 and IPv6 both have PTR records?

Yes. IPv4 reverse DNS uses the in-addr.arpa namespace and IPv6 reverse DNS uses ip6.arpa.

Is it bad if an IP address has no PTR record?

Not necessarily. Reverse DNS is optional, and many legitimate public IP addresses do not have a PTR hostname configured.

Does a PTR hostname prove who owns an IP address?

No. PTR naming provides network context, but allocation and registration information should be checked separately.

Does this tool perform FCrDNS?

No. This version performs the reverse PTR lookup only. It does not currently resolve the returned hostname forward again to confirm that it maps back to the original IP address.