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# Reverse IP lookup

Enter an IPv4 address and list the hostnames a passive DNS dataset has seen resolving to it, with upstream rate limits reported honestly.

Observed hostnames, not authority
No DNS protocol maps an address back to hostnames, so this reads a passive-DNS dataset: names that have been seen resolving to the address. A long, unrelated-looking list is normal on shared hosting and CDN space.

The free upstream rate-limits by day, and a spent budget shows here as an error rather than an empty list. The list is an observation record: it says nothing about who owns the address today, and a hostname present there may have moved long ago. For ownership, use an RDAP or whois lookup on the address itself.
OptionsLook up

## More network tools

- [IP range classifier](/network/ip-classify)
- [Live DNS lookup](/network/dns)
- [RDAP lookup](/network/rdap)
[All network tools](/network)

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Canonical HTML: https://nutter.tools/network/reverse-ip-lookup
Markdown version: https://nutter.tools/network/reverse-ip-lookup.md
Plain-text version: https://nutter.tools/network/reverse-ip-lookup.txt
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