Member Avatar for sloan31

Hey, does anyone know how to find all ip address space owned by a company....even better broken down by which RIR it's with.

Thanks

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A concise, practical approach that builds on 's ARIN pointer: a single RIR search rarely shows everything. Allocations and assignments can live in any of the five RIRs, and what is in the registry is not always the same as what is actually routed on the Internet.

Useful workflow:

  • Gather the company legal name(s), DBAs and any known ASNs or sample IPs.
  • Query each RIR registry (records or RDAP) to find org handles and allocated prefixes: ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC.
  • Cross-check what is actually announced in BGP with routing viewers: RIPEstat, BGPView, Hurricane Electric BGP Toolkit. Look up "prefixes originated by AS" for any discovered ASNs.
  • Map IPs to ASNs (or vice versa) using Team Cymru's IP-to-ASN service for quick verification: Team Cymru.
  • For large or automated work, use RIR delegated files or IANA's number resources to script lookups and reconcile results: IANA Number Resources.

Cautions: registry names may use holding companies or subsidiaries; blocks can be leased, transferred, or announced by third parties; IPv6 allocations are treated the same but are larger and easier to miss. The combination of registry (whois/RDAP) and routing (BGP) sources gives the most reliable, actionable listing.

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Member Avatar for Duki

Try .

Member Avatar for sloan31

Yeah, I went there...but still can't figure out how to get a listing of all ip space.

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