Special-Purpose IP Lookup: IANA IPv4 & IPv6 Registries
Find matching IANA special-purpose prefixes in a dated local snapshot, inspect longest-prefix matches, registry properties and source notes without probing a host.
Enabling local controls…
1. Special-purpose IP
One IPv4/IPv6 address (embedded IPv4 accepted); no CIDR, %zone or brackets. Complete IANA special-purpose registries load on demand from this site; only fixed asset requests, never your query. Input: 1 MiB; address: 45 characters; report: 1 MiB.
No match does not mean public, routable or safe. This registry does not cover every multicast or allocation record; no WHOIS, geolocation, DNS or live probe.
2. Original IANA attributes
Enter an address or load a sample, then look up.
How to use this tool
Load the same-origin registry snapshot, enter an address and review matching prefixes with their dates, references and notes. Your address is not sent in the data request.
When not to use it
No match does not mean public, routable or safe. The snapshot is not a live routing table, reputation service, allocation check or authorization decision.
Read the guide →