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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 1,229 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 19, 03:16 UTC 56 124.6.55.0/24 AS24482
Oct 19, 03:16 UTC 56 212.102.98.0/24 AS47254
Oct 19, 03:16 UTC 56 102.202.232.0/24 AS30990
Oct 19, 03:16 UTC 56 124.6.54.0/24 AS24482
Oct 19, 03:16 UTC 56 124.6.54.0/23 AS24482
Oct 19, 03:16 UTC 56 44.48.41.0/24 AS203729
Oct 19, 03:16 UTC 56 85.234.68.0/24 AS199524
Oct 19, 02:17 UTC 56 122.10.120.0/22 AS134548
Oct 19, 02:17 UTC 56 197.241.72.0/21 AS30990
Oct 19, 02:17 UTC 56 103.71.33.0/24 AS134548
Oct 19, 02:17 UTC 56 102.67.154.0/24 AS328482
Oct 19, 02:17 UTC 56 197.241.80.0/20 AS30990
Oct 19, 02:17 UTC 56 102.213.48.0/22 AS328856
Oct 19, 02:17 UTC 56 154.219.128.0/18 AS134548
Oct 19, 02:17 UTC 56 154.84.100.0/22 AS134548
Oct 19, 02:17 UTC 56 117.18.224.0/22 AS134548
Oct 19, 02:17 UTC 56 91.217.178.0/24 AS62378
Oct 19, 02:17 UTC 56 41.189.251.0/24 AS30990
Oct 19, 02:17 UTC 56 122.10.0.0/18 AS134548
Oct 19, 02:17 UTC 56 154.212.64.0/18 AS134548
Oct 19, 02:17 UTC 56 192.249.80.0/20 AS134548
Oct 19, 02:17 UTC 56 154.86.128.0/19 AS134548
Oct 19, 02:17 UTC 56 197.241.122.0/24 AS30990
Oct 19, 02:17 UTC 56 41.189.254.0/24 AS30990
Oct 19, 02:17 UTC 56 45.226.96.0/24 AS267020
Oct 19, 02:17 UTC 56 196.201.206.0/24 AS30990
Oct 19, 02:17 UTC 56 144.48.58.0/24 AS134548
Oct 19, 02:17 UTC 56 197.241.112.0/22 AS30990
Oct 19, 02:17 UTC 56 103.56.192.0/24 AS134548
Oct 19, 02:17 UTC 56 144.48.56.0/24 AS134548
Oct 19, 02:17 UTC 56 154.86.160.0/19 AS134548
Oct 19, 02:17 UTC 56 197.241.48.0/20 AS30990
Oct 19, 02:17 UTC 56 41.189.232.0/21 AS30990
Oct 19, 02:17 UTC 56 102.67.152.0/24 AS328482
Oct 19, 02:17 UTC 56 103.214.32.0/22 AS134548
Oct 19, 02:17 UTC 58 81.28.244.0/24 AS51538
Oct 19, 02:17 UTC 56 103.88.184.0/22 AS134548
Oct 19, 02:17 UTC 58 38.224.195.0/24 AS174
Oct 19, 02:17 UTC 56 154.85.128.0/18 AS134548
Oct 19, 02:17 UTC 56 216.250.108.0/22 AS134548
Oct 19, 02:17 UTC 56 197.241.41.0/24 AS30990
Oct 19, 02:17 UTC 56 41.189.252.0/24 AS30990
Oct 19, 02:17 UTC 56 211.239.188.0/24 AS9848
Oct 19, 02:17 UTC 56 154.212.72.0/21 AS134548
Oct 19, 02:17 UTC 56 93.93.242.0/24 AS134548
Oct 19, 02:17 UTC 56 103.73.88.0/22 AS134548
Oct 19, 02:17 UTC 56 197.241.44.0/24 AS30990
Oct 19, 02:17 UTC 58 38.224.202.0/24 AS174
Oct 19, 02:17 UTC 56 178.236.232.0/24 AS134548
Oct 19, 02:17 UTC 56 154.86.128.0/18 AS134548
Oct 19, 02:17 UTC 56 197.241.24.0/21 AS30990
Oct 19, 02:17 UTC 56 154.85.160.0/19 AS134548
Oct 19, 02:17 UTC 56 154.86.128.0/20 AS134548
Oct 19, 02:17 UTC 56 103.56.193.0/24 AS134548
Oct 19, 02:17 UTC 56 103.14.112.0/22 AS134548
Oct 19, 02:17 UTC 56 154.85.128.0/19 AS134548
Oct 19, 02:17 UTC 56 197.241.116.0/22 AS30990
Oct 19, 02:17 UTC 56 102.219.208.0/22 AS328856
Oct 19, 02:17 UTC 56 103.75.19.0/24 AS134548
Oct 19, 02:17 UTC 56 154.212.96.0/20 AS134548
Oct 19, 02:17 UTC 56 197.241.123.0/24 AS30990
Oct 19, 02:17 UTC 56 156.235.196.0/22 AS134548
Oct 19, 02:17 UTC 56 154.219.156.0/22 AS134548
Oct 19, 02:17 UTC 56 103.75.18.0/24 AS134548
Oct 19, 02:17 UTC 56 122.10.98.0/24 AS134548
Oct 19, 02:17 UTC 56 144.48.57.0/24 AS134548
Oct 19, 02:17 UTC 56 154.212.104.0/21 AS134548
Oct 19, 02:17 UTC 56 198.44.224.0/19 AS134548
Oct 19, 02:17 UTC 56 154.92.0.0/24 AS134548
Oct 19, 02:17 UTC 56 154.93.128.0/18 AS134548
Oct 19, 02:17 UTC 56 103.56.194.0/24 AS134548
Oct 19, 02:17 UTC 56 41.189.224.0/24 AS30990
Oct 19, 02:17 UTC 56 157.119.112.0/22 AS134548
Oct 19, 02:17 UTC 56 154.93.128.0/20 AS134548
Oct 19, 02:17 UTC 56 93.93.241.0/24 AS134548
Oct 19, 02:17 UTC 56 102.210.100.0/23 AS329379
Oct 19, 02:17 UTC 56 102.209.56.0/22 AS328856
Oct 19, 02:17 UTC 56 41.189.225.0/24 AS30990
Oct 19, 02:17 UTC 56 91.217.59.0/24 AS197251
Oct 19, 02:17 UTC 56 41.189.226.0/24 AS30990
Oct 19, 02:17 UTC 56 91.217.58.0/24 AS197251
Oct 19, 02:17 UTC 56 93.93.240.0/24 AS134548
Oct 19, 02:17 UTC 56 198.44.232.0/22 AS134548
Oct 19, 02:17 UTC 56 197.241.66.0/23 AS30990
Oct 19, 02:17 UTC 56 197.241.120.0/24 AS30990
Oct 19, 02:17 UTC 56 197.241.127.0/24 AS30990
Oct 19, 02:17 UTC 56 102.221.76.0/22 AS328787
Oct 19, 02:17 UTC 56 116.204.244.0/22 AS134548
Oct 19, 02:17 UTC 56 197.241.96.0/20 AS30990
Oct 19, 02:17 UTC 56 122.10.76.0/22 AS134548
Oct 19, 02:17 UTC 58 203.148.76.0/24 AS56012
Oct 19, 02:17 UTC 56 197.241.20.0/22 AS30990
Oct 19, 02:17 UTC 58 203.148.75.0/24 AS56012
Oct 19, 02:17 UTC 56 122.10.40.0/21 AS134548
Oct 19, 02:17 UTC 56 93.93.243.0/24 AS134548
Oct 19, 02:17 UTC 56 197.241.121.0/24 AS30990
Oct 19, 02:17 UTC 56 154.212.88.0/21 AS134548
Oct 19, 02:17 UTC 56 197.241.18.0/24 AS30990
Oct 19, 02:17 UTC 56 122.10.0.0/19 AS134548
Oct 19, 02:17 UTC 56 197.241.68.0/22 AS30990
Oct 19, 02:17 UTC 58 203.148.77.0/24 AS56012
Oct 19, 02:17 UTC 56 177.210.205.0/24 AS134548
Oct 19, 02:17 UTC 56 122.10.80.0/20 AS134548
Oct 19, 02:17 UTC 56 185.228.184.0/22 AS134548
Oct 19, 02:17 UTC 56 41.189.255.0/24 AS30990
Oct 19, 02:17 UTC 56 144.48.59.0/24 AS134548
Oct 19, 02:17 UTC 56 103.243.128.0/22 AS134548
Oct 19, 02:17 UTC 56 154.84.64.0/18 AS134548
Oct 19, 02:17 UTC 56 197.241.0.0/20 AS30990
Oct 19, 02:17 UTC 56 196.201.196.0/24 AS30990
Oct 19, 02:17 UTC 58 203.148.78.0/24 AS56012
Oct 19, 02:17 UTC 56 154.86.140.0/22 AS134548
Oct 19, 02:17 UTC 56 45.226.97.0/24 AS267020
Oct 19, 02:17 UTC 60 82.147.91.0/24 AS197392
Oct 19, 02:17 UTC 56 103.75.17.0/24 AS134548
Oct 19, 02:17 UTC 56 103.71.32.0/24 AS134548
Oct 19, 02:17 UTC 56 154.212.64.0/20 AS134548
Oct 19, 02:17 UTC 56 102.67.153.0/24 AS328482
Oct 19, 02:17 UTC 56 154.219.128.0/20 AS134548
Oct 19, 02:17 UTC 56 154.93.152.0/21 AS134548
Oct 19, 02:17 UTC 56 197.241.43.0/24 AS30990
Oct 19, 02:17 UTC 56 122.10.32.0/19 AS134548
Oct 19, 02:17 UTC 56 198.44.244.0/22 AS134548
Oct 19, 02:17 UTC 56 102.67.155.0/24 AS328482
Oct 19, 02:17 UTC 56 144.48.56.0/22 AS134548
Oct 19, 02:17 UTC 56 197.241.17.0/24 AS30990
Oct 19, 02:17 UTC 56 41.189.228.0/24 AS30990
Oct 19, 02:17 UTC 56 154.218.96.0/22 AS134548
Oct 19, 01:17 UTC 56 45.175.90.0/24 AS268892
Oct 19, 01:17 UTC 56 45.175.91.0/24 AS268892
Oct 19, 01:17 UTC 56 201.218.171.0/24 AS271370
Oct 19, 01:17 UTC 56 177.130.16.0/20 AS52742
Oct 19, 01:17 UTC 56 190.124.27.0/24 AS52304
Oct 19, 01:17 UTC 56 177.130.24.0/21 AS52742
Oct 19, 01:17 UTC 58 194.126.58.0/23 AS25122
Oct 19, 01:17 UTC 56 177.130.16.0/21 AS52742
Oct 19, 01:17 UTC 56 45.175.89.0/24 AS268892
Oct 19, 01:17 UTC 58 194.126.59.0/24 AS25122
Oct 19, 01:17 UTC 56 45.175.88.0/24 AS268892
Oct 19, 01:17 UTC 56 103.56.204.0/24 AS58477
Oct 19, 01:17 UTC 56 177.93.132.0/22 AS272432
Oct 19, 01:17 UTC 58 194.126.57.0/24 AS25122
Oct 19, 01:17 UTC 58 194.126.62.0/23 AS25122
Oct 19, 01:17 UTC 58 194.126.62.0/24 AS25122
Oct 19, 00:16 UTC 58 196.12.156.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.140.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.152.0/24 AS37006
Oct 19, 00:16 UTC 58 204.157.236.0/24 AS52511
Oct 19, 00:16 UTC 58 196.216.81.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.130.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.154.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.138.0/24 AS37006
Oct 19, 00:16 UTC 56 91.92.41.0/24 AS211443
Oct 19, 00:16 UTC 56 178.215.227.0/24 AS211443
Oct 19, 00:16 UTC 58 196.12.151.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.134.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.144.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.131.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.129.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.145.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.159.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.158.0/24 AS37006
Oct 19, 00:16 UTC 56 91.197.54.0/24 AS49356
Oct 19, 00:16 UTC 58 196.12.157.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.148.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.153.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.143.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.146.0/24 AS37006
Oct 19, 00:16 UTC 58 196.216.80.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.147.0/24 AS37006
Oct 19, 00:16 UTC 56 103.39.251.0/24 AS58678
Oct 19, 00:16 UTC 58 196.12.155.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.149.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.139.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.135.0/24 AS37006
Oct 19, 00:16 UTC 58 169.255.186.0/24 AS327885
Oct 19, 00:16 UTC 58 196.12.128.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.137.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.132.0/24 AS37006
Oct 19, 00:16 UTC 58 196.12.150.0/24 AS37006
Oct 18, 23:17 UTC 56 92.60.77.0/24 AS214557
Oct 18, 23:17 UTC 56 151.186.76.0/24 AS36692
Oct 18, 23:17 UTC 56 177.92.167.0/24 AS61918
Oct 18, 23:17 UTC 56 61.110.241.0/24 AS54994
Oct 18, 23:17 UTC 56 176.240.4.0/22 AS47524
Oct 18, 23:17 UTC 56 163.171.193.0/24 AS54994
Oct 18, 23:17 UTC 56 185.135.16.0/24 AS43848
Oct 18, 23:17 UTC 56 23.34.84.0/22 AS25019
Oct 18, 23:17 UTC 56 185.132.233.0/24 AS204657
Oct 18, 23:17 UTC 56 81.31.194.0/24 AS208220
Oct 18, 23:17 UTC 56 154.73.100.0/24 AS327746
Oct 18, 23:17 UTC 56 154.94.5.0/24 AS142403
Oct 18, 23:17 UTC 56 45.151.91.0/24 AS209101
Oct 18, 23:17 UTC 56 138.113.221.0/24 AS54994
Oct 18, 23:17 UTC 56 102.216.207.0/24 AS327746
Oct 18, 23:17 UTC 56 5.83.158.0/24 AS218500
Oct 18, 23:17 UTC 56 39.109.123.0/24 AS142403
Oct 18, 23:17 UTC 56 217.60.101.0/24 AS208220
Oct 18, 23:17 UTC 56 178.233.238.0/23 AS47524
Oct 18, 23:17 UTC 56 185.109.84.0/23 AS13214

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 2026-10-19 04:00 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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