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Pulse — AS-path anomaly

Unique-AS-path lengths (prepends collapsed) that deviate sharply from the recent 36-hour median for that prefix.

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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

Showing 200 most recent of 5,215 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 18, 06:16 UTC 62 202.92.144.0/22 AS45209
Oct 18, 06:16 UTC 56 103.56.204.0/24 AS58477
Oct 18, 05:16 UTC 58 196.12.158.0/24 AS37006
Oct 18, 05:16 UTC 56 168.210.88.0/21 AS20011
Oct 18, 05:16 UTC 58 197.243.48.0/22 AS37228
Oct 18, 05:16 UTC 58 196.12.131.0/24 AS37006
Oct 18, 05:16 UTC 58 196.216.80.0/24 AS37006
Oct 18, 05:16 UTC 62 45.125.12.0/24 AS55933
Oct 18, 05:16 UTC 56 109.232.88.0/21 AS50201
Oct 18, 05:16 UTC 58 196.12.137.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.135.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.144.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.153.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.145.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.150.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.130.0/24 AS37006
Oct 18, 05:16 UTC 56 142.65.184.0/24 AS243
Oct 18, 05:16 UTC 58 196.12.138.0/24 AS37006
Oct 18, 05:16 UTC 56 197.101.124.0/22 AS20011
Oct 18, 05:16 UTC 56 194.26.96.0/24 AS44529
Oct 18, 05:16 UTC 56 168.210.48.0/20 AS20011
Oct 18, 05:16 UTC 58 196.12.148.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.140.0/24 AS37006
Oct 18, 05:16 UTC 58 82.147.91.0/24 AS197392
Oct 18, 05:16 UTC 58 196.12.143.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.151.0/24 AS37006
Oct 18, 05:16 UTC 62 103.115.48.0/24 AS55933
Oct 18, 05:16 UTC 58 196.12.159.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.156.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.152.0/24 AS37006
Oct 18, 05:16 UTC 58 196.216.81.0/24 AS37006
Oct 18, 05:16 UTC 60 103.119.0.0/24 AS55933
Oct 18, 05:16 UTC 60 24.233.11.0/24 AS55933
Oct 18, 05:16 UTC 56 194.14.100.0/23 AS44529
Oct 18, 05:16 UTC 56 217.18.0.0/20 AS15807
Oct 18, 05:16 UTC 56 194.35.236.0/23 AS49007
Oct 18, 05:16 UTC 58 196.12.146.0/24 AS37006
Oct 18, 05:16 UTC 56 142.65.185.0/24 AS243
Oct 18, 05:16 UTC 58 196.12.157.0/24 AS37006
Oct 18, 05:16 UTC 56 142.65.176.0/22 AS243
Oct 18, 05:16 UTC 58 197.243.56.0/22 AS37228
Oct 18, 05:16 UTC 56 109.232.91.0/24 AS50201
Oct 18, 05:16 UTC 58 196.12.149.0/24 AS37006
Oct 18, 05:16 UTC 58 206.82.99.0/24 AS46455
Oct 18, 05:16 UTC 58 196.12.129.0/24 AS37006
Oct 18, 05:16 UTC 56 158.147.214.0/24 AS243
Oct 18, 05:16 UTC 58 196.12.128.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.154.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.132.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.155.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.147.0/24 AS37006
Oct 18, 05:16 UTC 58 196.12.134.0/24 AS37006
Oct 18, 05:16 UTC 62 103.246.244.0/24 AS55933
Oct 18, 05:16 UTC 58 196.12.139.0/24 AS37006
Oct 18, 04:16 UTC 56 151.113.204.0/24 AS46528
Oct 18, 04:16 UTC 56 151.113.215.0/24 AS46528
Oct 18, 04:16 UTC 56 151.113.207.0/24 AS46528
Oct 18, 04:16 UTC 56 151.113.255.0/24 AS46528
Oct 18, 04:16 UTC 56 151.113.213.0/24 AS46528
Oct 18, 04:16 UTC 56 151.113.248.0/22 AS46528
Oct 18, 04:16 UTC 56 103.76.51.0/24 AS139664
Oct 18, 04:16 UTC 56 151.113.206.0/24 AS46528
Oct 18, 04:16 UTC 56 188.215.93.0/24 AS47388
Oct 18, 04:16 UTC 56 94.176.43.0/24 AS47388
Oct 18, 04:16 UTC 56 91.206.36.0/23 AS47388
Oct 18, 04:16 UTC 56 191.217.204.0/24 AS198550
Oct 18, 04:16 UTC 56 151.113.205.0/24 AS46528
Oct 18, 04:16 UTC 56 94.176.42.0/24 AS47388
Oct 18, 04:16 UTC 56 165.65.206.0/23 AS60255
Oct 18, 04:16 UTC 56 151.113.214.0/24 AS46528
Oct 18, 04:16 UTC 56 213.207.52.0/22 AS39611
Oct 18, 03:16 UTC 56 37.202.205.0/24 AS213791
Oct 18, 03:16 UTC 56 38.211.244.0/24 AS213791
Oct 18, 03:16 UTC 56 144.79.158.0/24 AS137127
Oct 18, 02:17 UTC 56 93.183.127.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.103.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.127.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.107.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.113.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.232.0/24 AS216071
Oct 18, 02:17 UTC 56 185.157.213.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.100.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.67.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.132.0/24 AS216071
Oct 18, 02:17 UTC 56 195.26.226.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.253.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.104.0/24 AS216071
Oct 18, 02:17 UTC 56 93.183.89.0/24 AS216071
Oct 18, 02:17 UTC 56 178.130.41.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.118.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.114.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.243.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.101.0/24 AS216071
Oct 18, 02:17 UTC 56 195.200.31.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.127.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.118.0/24 AS216071
Oct 18, 02:17 UTC 58 91.209.251.0/24 AS197209
Oct 18, 02:17 UTC 56 212.34.152.0/24 AS216071
Oct 18, 02:17 UTC 56 195.200.19.0/24 AS216071
Oct 18, 02:17 UTC 56 109.107.167.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.246.0/24 AS216071
Oct 18, 02:17 UTC 56 195.26.227.0/24 AS216071
Oct 18, 02:17 UTC 56 141.163.127.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.85.0/24 AS216071
Oct 18, 02:17 UTC 56 212.111.88.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.136.0/24 AS216071
Oct 18, 02:17 UTC 56 5.35.45.0/24 AS216071
Oct 18, 02:17 UTC 56 141.163.125.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.71.0/24 AS216071
Oct 18, 02:17 UTC 56 195.200.28.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.77.0/24 AS216071
Oct 18, 02:17 UTC 56 80.85.244.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.109.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.227.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.252.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.123.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.238.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.105.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.245.0/24 AS216071
Oct 18, 02:17 UTC 56 178.217.102.0/24 AS216071
Oct 18, 02:17 UTC 56 93.183.90.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.121.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.83.0/24 AS216071
Oct 18, 02:17 UTC 56 141.163.113.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.155.0/24 AS216071
Oct 18, 02:17 UTC 56 93.183.88.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.108.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.120.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.237.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.99.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.115.0/24 AS216071
Oct 18, 02:17 UTC 56 185.121.234.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.128.0/24 AS216071
Oct 18, 02:17 UTC 56 185.245.104.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.226.0/24 AS216071
Oct 18, 02:17 UTC 56 194.242.127.0/24 AS48729
Oct 18, 02:17 UTC 56 91.84.119.0/24 AS216071
Oct 18, 02:17 UTC 56 195.26.224.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.148.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.96.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.110.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.247.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.116.0/24 AS216071
Oct 18, 02:17 UTC 56 109.107.165.0/24 AS216071
Oct 18, 02:17 UTC 56 185.121.235.0/24 AS216071
Oct 18, 02:17 UTC 56 93.183.91.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.135.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.74.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.241.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.236.0/24 AS216071
Oct 18, 02:17 UTC 56 185.245.105.0/24 AS216071
Oct 18, 02:17 UTC 56 109.107.186.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.124.0/24 AS216071
Oct 18, 02:17 UTC 56 80.85.247.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.98.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.151.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.239.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.113.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.131.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.244.0/24 AS216071
Oct 18, 02:17 UTC 56 185.157.214.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.80.0/24 AS216071
Oct 18, 02:17 UTC 56 93.183.125.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.233.0/24 AS216071
Oct 18, 02:17 UTC 56 178.130.42.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.106.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.114.0/24 AS216071
Oct 18, 02:17 UTC 56 185.21.15.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.104.0/24 AS216071
Oct 18, 02:17 UTC 56 194.60.135.0/24 AS216071
Oct 18, 02:17 UTC 56 185.21.13.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.115.0/24 AS216071
Oct 18, 02:17 UTC 56 194.246.83.0/24 AS216071
Oct 18, 02:17 UTC 56 195.200.26.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.138.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.242.0/24 AS216071
Oct 18, 02:17 UTC 56 185.245.107.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.224.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.100.0/24 AS216071
Oct 18, 02:17 UTC 56 141.163.119.0/24 AS216071
Oct 18, 02:17 UTC 56 93.183.126.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.108.0/24 AS216071
Oct 18, 02:17 UTC 56 195.200.16.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.86.0/24 AS216071
Oct 18, 02:17 UTC 56 185.157.212.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.112.0/24 AS216071
Oct 18, 02:17 UTC 56 194.164.32.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.109.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.145.0/24 AS216071
Oct 18, 02:17 UTC 56 5.35.68.0/24 AS216071
Oct 18, 02:17 UTC 56 195.200.18.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.72.0/24 AS216071
Oct 18, 02:17 UTC 56 141.163.114.0/24 AS216071
Oct 18, 02:17 UTC 56 91.84.105.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.119.0/24 AS216071
Oct 18, 02:17 UTC 56 212.34.141.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.117.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.240.0/24 AS216071
Oct 18, 02:17 UTC 56 89.110.111.0/24 AS216071
Oct 18, 02:17 UTC 56 77.238.225.0/24 AS216071

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 2026-10-18 06:25 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.

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