Pulse — AS-path anomaly
Unique-AS-path lengths (prepends collapsed) that deviate sharply from the recent 36-hour median for that prefix.
What is AS-path anomaly?
An AS-path anomaly is an unusual or implausible sequence of Autonomous Systems in a route advertisement whose unique-AS-path length (prepends collapsed) deviates sharply from the recent 36-hour median for that prefix — an unexpected transit AS, a loop, or a sudden detour. It can reveal a route leak or a path-prepending mistake.
Geographic distribution
Flagged events
Most recent first · last 24h| When | Severity | Prefix | AS |
|---|
No as-path anomaly events flagged in the last 24h.
Frequently Asked Questions
What is a BGP AS-path anomaly?
An AS-path anomaly is an unusual or implausible sequence of Autonomous Systems in a route advertisement whose unique-AS-path length (prepends collapsed) deviates sharply from the recent 36-hour median for that prefix — an unexpected transit AS, a loop, or a sudden detour. It can reveal a route leak or a path-prepending mistake.
Where does this data come from?
Every event is detected from live BGP updates collected across 23 RIPE RIS route collectors worldwide, ingested into a ClickHouse time-series store and re-evaluated every few minutes. No third-party feed is resold; the analysis is original to WorldIP.io.
How often is the AS-path anomaly feed updated?
The feed recomputes roughly every 5 minutes; it was last refreshed at 2026-08-15 03:40 UTC.
How do I subscribe to AS-path anomaly events?
Subscribe to the Atom feed at /pulse/bgp/aspath.atom or poll the JSON endpoint at /api/pulse/bgp/aspath.
