Reverse ASN Lookup — Search ASNs by Organization Name

Peering emails reference AS numbers but business development contacts know only brand names. Abuse desks receive incident IPs and need ASN plus org string for provider tickets. Threat intel analysts pivot from campaign hosting labels to routable AS identifiers for firewall policy.

Reverse search closes the gap from human-readable organization names to BGP autonomous system numbers used in routing policy and IRR objects.

Keyword search matches registry organization strings — partial names work when distinctive. Searching cloud may return hundreds of matches; searching a distinctive brand narrows results. Review country and registry columns to disambiguate similarly named regional subsidiaries.

Results reflect BGPView index snapshots — not live WHOIS phone contacts. Follow to bgp-route-lookup for prefix enumeration after picking the correct ASN.

When you already hold AS15169 format input, direct lookup returns authoritative ASN metadata without fuzzy name matching. Use this to confirm a number spotted in traceroute or BGP session logs before drafting peering requests.

Malformed AS strings fail validation early with clear feedback.

Paste a public IPv4 address to learn which ASN announces it in BGP data. This mirrors forward IP-to-ASN steps but lives on a page optimized for researchers who arrived with an IP from logs and need org context fast.

Addresses recently renumbered may show stale origin until BGP converges — corroborate with multiple tools and timestamps.

We query public BGPView APIs indexing global routing registry and BGP snapshots. Data quality is high for major providers but community-maintained — occasional gaps or delayed updates after acquisitions.

Document query UTC time in tickets when citing ASN results for audit trails.

asn-lookup on our suite emphasizes classic forward ASN detail pages. bgp-route-lookup adds prefix lists when querying by AS number. reverse-asn-lookup optimizes org-name search and disambiguation lists — start here with a company name, then drill into bgp-route-lookup for prefixes.

Together they cover name → AS → prefix workflow without leaving VSPIC.

Peering coordinators search partner legal names, confirm ASN, verify country matches expected region, then export ASN for IRR route object updates. Transit sales engineers validate customer ASN ownership claims before quoting.

Include ASN and org string in peering portal forms to reduce back-and-forth.

Incident responders convert attacker IPs to ASN and org, then query abuse-contact-finder or WHOIS for ticket routing. Firewall policy sometimes blocks entire ASNs during campaigns — confirm ASN identity before broad blocks affect innocent neighbors on shared hosting ASNs.

ASN blocking is blunt — prefer prefix-level or IP-level when possible.

Acquired startups may keep old ASN under new parent branding months later. Organization search on new brand might not list legacy ASN until registry updates. Search both old and new names when M&A is public knowledge.

Legal ownership proof requires contracts, not BGP registry strings.

Integrators call extended API with reverse-asn-lookup action and query parameter. Parse matches array and asn fields in JSON. Cache org metadata longer than IP mappings — org names change less frequently than IP reassignments within an AS.

Respect rate limits when batching internal CMDB enrichment jobs.