Query ASN and prefix ownership data via bgp.tools (BGPView's replacement)
domain: bgp.tools · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Note that BGPView (bgpview.io) shut down in November 2025 — do not build against it; use bgp.tools or RIPEstat instead for public BGP/ASN data.
For single lookups, query bgp.tools' WHOIS service on TCP port 43, e.g. a -v AS<number> or IP/MAC query, which returns pipe-delimited AS/prefix/country/registry/allocation-date fields.
For bulk lookups, open a WHOIS session, send begin, then a list of queries, then end, to batch multiple lookups in one TCP session.
For full-table analysis, download https://bgp.tools/table.txt or table.jsonl (JSON-lines with CIDR/ASN/Hits fields) and filter client-side, plus https://bgp.tools/asns.csv for ASN-name mapping.
Set a specific, contactable User-Agent string (e.g. yourcompany bgp.tools - contact@yourcompany.com) on every request — generic or default User-Agents get blocked since there's no other way to reach you.
Known gotchas
Table dumps (table.txt/table.jsonl) update at best every ~30 minutes — bgp.tools explicitly asks you not to re-download more often than that, and to cache asns.csv for 24 hours.
There is no traditional query-by-ASN REST/JSON endpoint — it's WHOIS-protocol lookups plus full-table flat-file dumps you filter yourself, a different integration shape than a typical REST API.
Scraping the human-facing HTML site instead of using these documented export endpoints can get your IP banned without notice.
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