usefulweb.site ASN Relationship Explorer

Internet infrastructure explorers

ASN Relationship Explorer

An autonomous system at a glance: holder, country, BGP neighbours and announced prefixes.

Pasted mode: {asn, asOverview, asnNeighbours?, announcedPrefixes?, rirStatsCountry?} — full RIPEstat responses or their "data" objects.

Try an example: Pasted RIPEstat data for AS3333 (RIPE NCC)

How it works

Explains an Autonomous System Number with RIPEstat data: registered holder and country, neighbours observed in RIPE RIS AS paths (left = towards the collectors, typically upstreams/peers; right = towards the origin, typically customers), announced IPv4/IPv6 prefixes with address-space totals, and a neighbour graph.

  • as-overview: registered holder and whether the AS is announced; rir-stats-country: country of the registration (RIR statistics), not where the network operates.
  • asn-neighbours: ASes adjacent to this AS in RIS AS paths. Per RIPEstat, "left" neighbours appear between this AS and the RIS collector (typically its upstream providers or peers) and "right" neighbours appear between it and the origin (typically customers). "Uncertain" = seen on the left only as direct peers of a RIS collector. "Power" = how often the adjacency was observed. Public BGP data cannot reliably separate peers from providers.
  • announced-prefixes: prefixes originated by the AS over RIPEstat's default window (last 2 weeks); totals in /24 (IPv4) and /48 (IPv6) equivalents.
  • Live mode also looks up holder names of the 10 strongest neighbours (as-overview).

For scripts and AI agents

  • JSON API: POST https://asnrelationshipexplorer.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://asnrelationshipexplorer.usefulweb.site/mcp · tool name asn_relationship_explorer
Example request
curl -s -X POST https://asnrelationshipexplorer.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{…see OpenAPI examples…}'

Related tools

  • BGP Route Explorer – Who announces an IP or prefix in BGP: origin ASes, RPKI validity, visibility and origin changes.
  • Global DNS Explorer – Ask every authoritative name server and public resolvers: records, propagation, DNSSEC, mistakes.
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