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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 5,780 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 14, 22:16 UTC 56 85.155.128.0/24 AS213176
Oct 14, 22:16 UTC 56 188.241.67.0/24 AS64445
Oct 14, 22:16 UTC 56 115.108.211.0/24 AS17908
Oct 14, 22:16 UTC 56 196.208.18.0/23 AS20011
Oct 14, 22:16 UTC 56 23.142.89.0/24 AS203729
Oct 14, 22:16 UTC 56 198.54.9.0/24 AS37130
Oct 14, 22:16 UTC 56 77.47.176.0/23 AS25500
Oct 14, 22:16 UTC 56 45.183.188.0/22 AS269298
Oct 14, 22:16 UTC 56 91.216.174.0/24 AS197055
Oct 14, 22:16 UTC 56 163.195.38.0/24 AS37130
Oct 14, 22:16 UTC 56 202.37.133.0/24 AS152687
Oct 14, 22:16 UTC 56 197.101.136.0/21 AS20011
Oct 14, 22:16 UTC 56 192.96.235.0/24 AS37130
Oct 14, 22:16 UTC 56 198.54.4.0/22 AS37130
Oct 14, 22:16 UTC 56 188.240.229.0/24 AS64445
Oct 14, 22:16 UTC 56 77.47.192.0/20 AS25500
Oct 14, 22:16 UTC 56 44.30.201.0/24 AS208755
Oct 14, 22:16 UTC 56 200.47.29.0/24 AS7908
Oct 14, 22:16 UTC 60 120.50.59.0/24 AS132196
Oct 14, 22:16 UTC 56 58.97.162.0/24 AS58884
Oct 14, 22:16 UTC 56 115.108.210.0/24 AS17908
Oct 14, 22:16 UTC 56 77.47.136.0/22 AS25500
Oct 14, 22:16 UTC 56 192.96.241.0/24 AS37130
Oct 14, 22:16 UTC 56 163.195.0.0/17 AS37130
Oct 14, 22:16 UTC 56 38.211.244.0/24 AS213791
Oct 14, 22:16 UTC 56 200.47.4.0/24 AS7908
Oct 14, 22:16 UTC 56 77.47.128.0/21 AS25500
Oct 14, 22:16 UTC 56 185.2.177.0/24 AS42473
Oct 14, 22:16 UTC 56 200.47.145.0/24 AS7908
Oct 14, 22:16 UTC 56 44.30.33.0/24 AS208755
Oct 14, 22:16 UTC 56 176.223.64.0/24 AS64445
Oct 14, 22:16 UTC 56 103.38.48.0/24 AS132506
Oct 14, 22:16 UTC 56 188.241.143.0/24 AS64445
Oct 14, 22:16 UTC 56 197.101.170.0/23 AS20011
Oct 14, 22:16 UTC 56 77.47.214.0/23 AS25500
Oct 14, 22:16 UTC 56 185.184.242.0/24 AS64445
Oct 14, 22:16 UTC 56 164.151.0.0/17 AS37130
Oct 14, 22:16 UTC 56 45.64.195.0/24 AS17625
Oct 14, 22:16 UTC 56 200.47.0.0/24 AS7908
Oct 14, 22:16 UTC 56 188.172.255.0/24 AS42473
Oct 14, 22:16 UTC 56 185.26.74.0/24 AS42065
Oct 14, 22:16 UTC 56 196.28.42.0/23 AS20011
Oct 14, 22:16 UTC 56 77.47.224.0/20 AS25500
Oct 14, 22:16 UTC 56 196.208.40.0/22 AS20011
Oct 14, 22:16 UTC 64 204.157.236.0/24 AS52511
Oct 14, 22:16 UTC 56 188.240.228.0/23 AS64445
Oct 14, 22:16 UTC 60 120.50.60.0/24 AS132196
Oct 14, 22:16 UTC 56 94.156.34.0/24 AS60859
Oct 14, 22:16 UTC 56 196.28.40.0/24 AS20011
Oct 14, 22:16 UTC 56 198.252.116.0/22 AS54934
Oct 14, 22:16 UTC 56 77.47.184.0/21 AS25500
Oct 14, 22:16 UTC 56 192.96.238.0/24 AS37130
Oct 14, 22:16 UTC 56 201.71.26.0/24 AS270290
Oct 14, 22:16 UTC 56 77.47.208.0/23 AS25500
Oct 14, 22:16 UTC 56 198.54.1.0/24 AS37130
Oct 14, 22:16 UTC 56 188.241.139.0/24 AS64445
Oct 14, 22:16 UTC 56 163.195.40.0/22 AS37130
Oct 14, 22:16 UTC 56 163.195.128.0/17 AS37130
Oct 14, 22:16 UTC 56 192.96.236.0/24 AS37130
Oct 14, 22:16 UTC 56 196.208.36.0/22 AS20011
Oct 14, 22:16 UTC 56 197.101.168.0/23 AS20011
Oct 14, 22:16 UTC 56 196.208.44.0/22 AS20011
Oct 14, 22:16 UTC 56 198.54.8.0/24 AS37130
Oct 14, 22:16 UTC 56 197.101.134.0/23 AS20011
Oct 14, 22:16 UTC 56 200.47.8.0/21 AS7908
Oct 14, 22:16 UTC 56 196.208.80.0/22 AS20011
Oct 14, 22:16 UTC 56 193.202.17.0/24 AS35056
Oct 14, 22:16 UTC 56 77.47.160.0/20 AS25500
Oct 14, 22:16 UTC 56 200.47.23.0/24 AS7908
Oct 14, 22:16 UTC 56 45.234.188.0/24 AS267377
Oct 14, 22:16 UTC 56 77.47.216.0/21 AS25500
Oct 14, 22:16 UTC 56 188.241.66.0/24 AS64445
Oct 14, 22:16 UTC 56 209.87.222.0/24 AS31997
Oct 14, 22:16 UTC 56 196.208.48.0/22 AS20011
Oct 14, 22:16 UTC 56 200.47.16.0/21 AS7908
Oct 14, 22:16 UTC 56 44.48.41.0/24 AS203729
Oct 14, 22:16 UTC 56 196.28.40.0/21 AS20011
Oct 14, 22:16 UTC 56 1.7.165.0/24 AS9583
Oct 14, 22:16 UTC 56 200.3.116.0/22 AS7908
Oct 14, 22:16 UTC 56 209.35.253.0/24 AS213176
Oct 14, 22:16 UTC 60 120.50.61.0/24 AS132196
Oct 14, 22:16 UTC 56 37.252.245.0/24 AS42473
Oct 14, 22:16 UTC 56 192.96.239.0/24 AS37130
Oct 14, 22:16 UTC 56 188.241.138.0/24 AS64445
Oct 14, 22:16 UTC 56 77.47.140.0/23 AS25500
Oct 14, 22:16 UTC 56 196.28.32.0/21 AS20011
Oct 14, 22:16 UTC 56 196.2.16.0/21 AS20011
Oct 14, 22:16 UTC 56 188.214.199.0/24 AS64445
Oct 14, 21:17 UTC 58 185.255.89.0/24 AS61173
Oct 14, 21:17 UTC 56 43.230.195.0/24 AS23673
Oct 14, 21:17 UTC 56 198.90.73.0/24 AS19408
Oct 14, 21:17 UTC 56 203.189.135.0/24 AS23673
Oct 14, 21:17 UTC 56 190.104.33.0/24 AS52363
Oct 14, 21:17 UTC 56 177.91.44.0/23 AS263427
Oct 14, 21:17 UTC 56 199.193.226.0/24 AS40187
Oct 14, 21:17 UTC 56 203.189.140.0/24 AS23673
Oct 14, 21:17 UTC 56 208.71.72.0/21 AS40252
Oct 14, 21:17 UTC 56 199.193.227.0/24 AS40187
Oct 14, 21:17 UTC 56 190.112.188.0/24 AS52363
Oct 14, 21:17 UTC 56 208.90.187.0/24 AS40187
Oct 14, 21:17 UTC 56 199.193.225.0/24 AS40187
Oct 14, 21:17 UTC 56 43.230.192.0/22 AS23673
Oct 14, 21:17 UTC 56 43.230.194.0/24 AS23673
Oct 14, 21:17 UTC 56 43.230.192.0/24 AS23673
Oct 14, 21:17 UTC 56 199.193.224.0/24 AS40187
Oct 14, 21:17 UTC 56 43.230.193.0/24 AS23673
Oct 14, 21:17 UTC 56 102.205.100.0/22 AS329578
Oct 14, 21:17 UTC 56 208.90.186.0/24 AS40187
Oct 14, 20:17 UTC 56 102.205.195.0/24 AS329550
Oct 14, 20:17 UTC 56 193.0.14.0/23 AS25152
Oct 14, 20:17 UTC 60 207.157.159.0/24 AS54179
Oct 14, 20:17 UTC 56 186.148.192.0/23 AS61461
Oct 14, 20:17 UTC 56 104.245.128.0/21 AS19116
Oct 14, 20:17 UTC 56 82.27.182.0/24 AS139057
Oct 14, 20:17 UTC 60 190.40.101.0/24 AS6147
Oct 14, 20:17 UTC 56 190.124.30.0/23 AS61461
Oct 14, 20:17 UTC 60 199.96.48.0/22 AS4208
Oct 14, 20:17 UTC 60 185.33.72.0/22 AS213070
Oct 14, 20:17 UTC 58 200.1.7.0/24 AS271754
Oct 14, 20:17 UTC 56 203.189.159.0/24 AS23673
Oct 14, 20:17 UTC 56 211.43.149.0/24 AS54994
Oct 14, 20:17 UTC 60 170.185.136.0/24 AS11686
Oct 14, 20:17 UTC 62 45.178.55.0/24 AS269776
Oct 14, 19:16 UTC 56 89.116.213.0/24 AS47583
Oct 14, 19:16 UTC 56 185.173.18.0/24 AS206763
Oct 14, 19:16 UTC 56 200.24.98.0/24 AS266416
Oct 14, 19:16 UTC 56 71.18.118.0/24 AS396986
Oct 14, 19:16 UTC 58 82.27.180.0/24 AS139057
Oct 14, 19:16 UTC 56 193.84.78.0/24 AS43298
Oct 14, 19:16 UTC 56 95.142.204.0/23 AS47542
Oct 14, 19:16 UTC 56 181.119.91.0/24 AS52468
Oct 14, 19:16 UTC 56 94.131.4.0/24 AS8772
Oct 14, 18:17 UTC 56 193.84.104.0/22 AS2852
Oct 14, 18:17 UTC 56 193.84.55.0/24 AS2852
Oct 14, 18:17 UTC 56 78.128.128.0/17 AS2852
Oct 14, 18:17 UTC 56 193.84.160.0/20 AS2852
Oct 14, 18:17 UTC 56 147.228.0.0/16 AS2852
Oct 14, 18:17 UTC 56 146.102.0.0/16 AS2852
Oct 14, 18:17 UTC 58 45.232.10.0/24 AS267281
Oct 14, 18:17 UTC 56 177.85.243.0/24 AS270602
Oct 14, 18:17 UTC 60 177.66.76.0/24 AS264117
Oct 14, 18:17 UTC 56 147.230.0.0/16 AS2852
Oct 14, 18:17 UTC 56 149.96.204.0/22 AS16839
Oct 14, 18:17 UTC 56 185.8.160.0/22 AS2852
Oct 14, 18:17 UTC 58 170.84.2.0/23 AS263589
Oct 14, 18:17 UTC 56 193.84.192.0/19 AS2852
Oct 14, 18:17 UTC 56 147.33.0.0/16 AS2852
Oct 14, 18:17 UTC 56 193.84.80.0/22 AS2852
Oct 14, 18:17 UTC 60 189.76.72.0/23 AS52752
Oct 14, 18:17 UTC 56 177.85.242.0/24 AS270602
Oct 14, 18:17 UTC 56 185.123.171.0/24 AS200005
Oct 14, 18:17 UTC 56 147.231.0.0/16 AS2852
Oct 14, 18:17 UTC 56 193.84.56.0/21 AS2852
Oct 14, 18:17 UTC 56 147.251.0.0/16 AS2852
Oct 14, 18:17 UTC 60 177.66.77.0/24 AS264117
Oct 14, 18:17 UTC 58 140.150.31.0/24 AS54994
Oct 14, 18:17 UTC 56 193.84.208.0/20 AS2852
Oct 14, 18:17 UTC 56 217.112.158.0/24 AS200005
Oct 14, 18:17 UTC 58 154.64.20.0/22 AS271493
Oct 14, 18:17 UTC 56 158.194.0.0/16 AS2852
Oct 14, 18:17 UTC 56 193.84.192.0/20 AS2852
Oct 14, 18:17 UTC 56 158.196.0.0/16 AS2852
Oct 14, 18:17 UTC 56 217.112.151.0/24 AS200005
Oct 14, 18:17 UTC 56 147.32.0.0/16 AS2852
Oct 14, 18:17 UTC 58 138.117.76.0/22 AS263774
Oct 14, 18:17 UTC 58 192.6.195.0/24 AS274757
Oct 14, 18:17 UTC 56 193.84.32.0/20 AS2852
Oct 14, 18:17 UTC 56 185.123.170.0/24 AS200005
Oct 14, 18:17 UTC 56 195.178.64.0/19 AS2852
Oct 14, 18:17 UTC 56 193.84.53.0/24 AS2852
Oct 14, 18:17 UTC 56 193.84.116.0/23 AS2852
Oct 14, 18:17 UTC 56 195.113.0.0/16 AS2852
Oct 14, 18:17 UTC 56 149.96.132.0/24 AS16839
Oct 14, 18:17 UTC 56 160.216.0.0/16 AS2852
Oct 14, 18:17 UTC 56 149.96.133.0/24 AS16839
Oct 14, 18:17 UTC 58 170.84.0.0/23 AS263589
Oct 14, 17:16 UTC 56 186.216.192.0/23 AS52973
Oct 14, 17:16 UTC 56 103.35.110.0/24 AS23991
Oct 14, 17:16 UTC 56 186.216.196.0/23 AS52973
Oct 14, 17:16 UTC 56 103.178.187.0/24 AS63969
Oct 14, 17:16 UTC 56 202.40.185.0/24 AS23991
Oct 14, 17:16 UTC 56 43.239.75.0/24 AS133443
Oct 14, 17:16 UTC 56 103.177.124.0/23 AS63969
Oct 14, 17:16 UTC 56 103.124.250.0/24 AS63969
Oct 14, 17:16 UTC 56 202.40.186.0/24 AS23991
Oct 14, 17:16 UTC 56 186.216.200.0/23 AS52973
Oct 14, 17:16 UTC 56 186.216.204.0/23 AS52973
Oct 14, 17:16 UTC 56 103.35.109.0/24 AS23991
Oct 14, 17:16 UTC 56 45.149.56.0/24 AS209097
Oct 14, 17:16 UTC 56 119.31.254.0/24 AS54994
Oct 14, 17:16 UTC 56 186.216.200.0/22 AS52973
Oct 14, 17:16 UTC 56 186.216.194.0/23 AS52973
Oct 14, 17:16 UTC 56 186.216.192.0/22 AS52973
Oct 14, 17:16 UTC 56 43.132.86.0/24 AS139341
Oct 14, 17:16 UTC 56 186.216.206.0/23 AS52973
Oct 14, 17:16 UTC 56 202.40.188.0/24 AS23991
Oct 14, 17:16 UTC 56 186.216.202.0/23 AS52973
Oct 14, 17:16 UTC 60 102.204.253.0/24 AS329614
Oct 14, 17:16 UTC 56 186.216.198.0/23 AS52973
Oct 14, 17:16 UTC 56 114.111.58.0/24 AS54994

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 2026-10-14 22:55 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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