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IP to Hostname

Find the reverse DNS hostname for a public IPv4 or IPv6 address.

Reverse DNSIPv4IPv6No Signup

Last updated: May 29, 2026

The IP address you enter is sent to our server, which proxies a reverse DNS (PTR) query to Cloudflare's public DNS-over-HTTPS resolver and returns the result. Your query itself is not written to a database — only a temporary, in-memory rate-limit counter is kept, which clears automatically.
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What is IP to Hostname?

IP to Hostname performs a reverse DNS lookup. Instead of asking DNS for the address of a hostname, it converts an IP address into the matching reverse lookup name and queries PTR records. PTR records are commonly used by mail systems, hosting providers, and network operators to identify the hostname associated with an IP address.

How to Use IP to Hostname

1

Enter an IPv4 or IPv6 address.

2

Click Find PTR.

3

Review the PTR hostnames returned by reverse DNS.

4

Copy a hostname or download the lookup report.

Common Use Cases

  • Checking the reverse DNS name for a mail server IP.
  • Identifying the hostname configured by a hosting provider.
  • Investigating IPs found in server logs.
  • Validating PTR setup before sending mail from a server.
  • Comparing forward DNS and reverse DNS during network troubleshooting.

Example Input and Output

Reverse DNS lookup for a public DNS resolver.

IP address
8.8.8.8
PTR record
PTR: dns.google

How This Tool Works

IPv4 addresses are reversed into in-addr.arpa names. IPv6 addresses are expanded to nibbles and reversed into ip6.arpa names. The tool then queries PTR records through the DNS proxy.

Technical Stack

PTR recordsin-addr.arpaip6.arpaDNS-over-HTTPS

Privacy Note

The IP address is converted into a reverse DNS query and sent through the WebToolsPlanet DNS proxy to Cloudflare DNS-over-HTTPS.

Frequently Asked Questions

What is a PTR record?

A PTR record maps an IP address back to a hostname. It is the DNS record type used for reverse DNS.

Why does an IP address have no hostname?

PTR records are optional. Many IP addresses, especially consumer or temporary cloud addresses, may not have a meaningful reverse DNS hostname.

Does reverse DNS prove who owns an IP?

No. PTR records are useful hints, but ownership should be checked with IP allocation, ASN, or provider data.

Can this check IPv6 reverse DNS?

Yes. IPv6 addresses are expanded and converted into ip6.arpa PTR query names before lookup.

Is this the same as IP geolocation?

No. Reverse DNS returns hostnames. IP geolocation estimates country, city, ISP, and ASN data.

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