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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 1,134 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 17, 08:16 UTC 56 80.254.17.0/24 AS39101
Oct 17, 08:16 UTC 56 147.185.221.0/24 AS400519
Oct 17, 08:16 UTC 56 95.170.146.0/24 AS49987
Oct 17, 08:16 UTC 58 194.226.97.0/24 AS197695
Oct 17, 08:16 UTC 56 204.197.171.0/24 AS400226
Oct 17, 08:16 UTC 56 92.240.194.0/23 AS39735
Oct 17, 08:16 UTC 56 118.94.85.0/24 AS13150
Oct 17, 08:16 UTC 56 185.149.127.0/24 AS202835
Oct 17, 08:16 UTC 56 79.175.34.0/24 AS12418
Oct 17, 08:16 UTC 56 198.22.204.0/23 AS400519
Oct 17, 08:16 UTC 56 194.67.116.0/24 AS197695
Oct 17, 08:16 UTC 56 209.25.140.0/22 AS400519
Oct 17, 08:16 UTC 56 195.191.226.0/23 AS41775
Oct 17, 08:16 UTC 56 94.138.147.0/24 AS199317
Oct 17, 08:16 UTC 56 118.94.91.0/24 AS13150
Oct 17, 08:16 UTC 56 174.35.49.0/24 AS54994
Oct 17, 08:16 UTC 56 38.19.48.0/24 AS274697
Oct 17, 08:16 UTC 56 77.235.202.0/24 AS12418
Oct 17, 08:16 UTC 56 45.183.188.0/22 AS269298
Oct 17, 08:16 UTC 56 81.89.80.0/21 AS39789
Oct 17, 08:16 UTC 60 177.8.157.0/24 AS263286
Oct 17, 08:16 UTC 58 193.151.55.0/24 AS207990
Oct 17, 08:16 UTC 58 77.81.93.0/24 AS207990
Oct 17, 08:16 UTC 58 113.19.96.0/22 AS17639
Oct 17, 08:16 UTC 58 45.113.115.0/24 AS63888
Oct 17, 08:16 UTC 56 168.222.192.0/24 AS197695
Oct 17, 08:16 UTC 56 223.31.156.0/24 AS9583
Oct 17, 08:16 UTC 58 193.28.237.0/24 AS207990
Oct 17, 08:16 UTC 56 200.219.154.0/24 AS11644
Oct 17, 08:16 UTC 58 195.3.139.0/24 AS207990
Oct 17, 08:16 UTC 56 95.80.117.0/24 AS12418
Oct 17, 08:16 UTC 56 195.24.71.0/24 AS197695
Oct 17, 08:16 UTC 56 108.59.170.0/23 AS31898
Oct 17, 08:16 UTC 56 95.80.64.0/24 AS12418
Oct 17, 08:16 UTC 58 45.112.24.0/24 AS63888
Oct 17, 08:16 UTC 56 124.6.54.0/24 AS24482
Oct 17, 08:16 UTC 60 91.231.146.0/24 AS197865
Oct 17, 08:16 UTC 56 89.108.66.0/24 AS197695
Oct 17, 08:16 UTC 56 130.49.151.0/24 AS197695
Oct 17, 08:16 UTC 58 194.226.165.0/24 AS197695
Oct 17, 08:16 UTC 62 204.157.236.0/24 AS52511
Oct 17, 08:16 UTC 60 177.8.156.0/24 AS263286
Oct 17, 08:16 UTC 56 77.235.222.0/24 AS12418
Oct 17, 08:16 UTC 56 195.95.218.0/24 AS57274
Oct 17, 08:16 UTC 56 124.6.55.0/24 AS24482
Oct 17, 08:16 UTC 56 91.240.111.0/24 AS58301
Oct 17, 08:16 UTC 58 95.175.86.0/24 AS207990
Oct 17, 08:16 UTC 56 185.14.5.0/24 AS42482
Oct 17, 08:16 UTC 56 213.221.14.0/24 AS57580
Oct 17, 08:16 UTC 56 31.44.248.0/23 AS42971
Oct 17, 08:16 UTC 56 103.210.226.0/24 AS151358
Oct 17, 08:16 UTC 56 95.80.91.0/24 AS12418
Oct 17, 08:16 UTC 56 95.128.136.0/21 AS44572
Oct 17, 08:16 UTC 56 185.14.6.0/23 AS42482
Oct 17, 08:16 UTC 58 95.175.92.0/24 AS207990
Oct 17, 08:16 UTC 58 95.175.88.0/24 AS207990
Oct 17, 08:16 UTC 56 206.237.43.0/24 AS151358
Oct 17, 08:16 UTC 58 186.219.255.0/24 AS262997
Oct 17, 08:16 UTC 56 185.53.104.0/23 AS203714
Oct 17, 08:16 UTC 56 80.254.16.0/20 AS39101
Oct 17, 08:16 UTC 56 80.254.23.0/24 AS39101
Oct 17, 08:16 UTC 56 124.6.54.0/23 AS24482
Oct 17, 08:16 UTC 56 212.102.98.0/24 AS47254
Oct 17, 08:16 UTC 56 69.9.176.0/20 AS400519
Oct 17, 08:16 UTC 58 185.212.29.0/24 AS57212
Oct 17, 08:16 UTC 58 78.31.160.0/23 AS199136
Oct 17, 08:16 UTC 56 23.128.248.0/24 AS400226
Oct 17, 08:16 UTC 58 194.226.166.0/24 AS197695
Oct 17, 08:16 UTC 58 103.157.42.0/24 AS131642
Oct 17, 08:16 UTC 56 62.213.100.0/24 AS197695
Oct 17, 08:16 UTC 56 58.97.162.0/24 AS58884
Oct 17, 08:16 UTC 58 103.194.151.0/24 AS63888
Oct 17, 08:16 UTC 56 81.89.80.0/24 AS39789
Oct 17, 08:16 UTC 56 80.254.16.0/21 AS39101
Oct 17, 08:16 UTC 56 172.98.52.0/24 AS399899
Oct 17, 08:16 UTC 56 89.185.92.0/22 AS39735
Oct 17, 08:16 UTC 56 185.250.128.0/23 AS39101
Oct 17, 08:16 UTC 56 185.216.100.0/22 AS50374
Oct 17, 08:16 UTC 56 93.189.148.0/24 AS60231
Oct 17, 08:16 UTC 56 185.242.116.0/22 AS42971
Oct 17, 08:16 UTC 56 185.250.130.0/23 AS39101
Oct 17, 07:16 UTC 56 202.62.71.0/24 AS17483
Oct 17, 07:16 UTC 56 186.211.235.0/24 AS14840
Oct 17, 07:16 UTC 56 45.123.27.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.67.0/24 AS17483
Oct 17, 07:16 UTC 56 45.123.24.0/24 AS17483
Oct 17, 07:16 UTC 56 38.87.169.0/24 AS400302
Oct 17, 07:16 UTC 56 202.62.87.0/24 AS17483
Oct 17, 07:16 UTC 56 186.211.232.0/22 AS14840
Oct 17, 07:16 UTC 56 103.219.169.0/24 AS396356
Oct 17, 07:16 UTC 56 103.171.200.0/24 AS137127
Oct 17, 07:16 UTC 58 179.127.72.0/24 AS263283
Oct 17, 07:16 UTC 56 202.62.88.0/24 AS17483
Oct 17, 07:16 UTC 56 45.139.41.0/24 AS208401
Oct 17, 07:16 UTC 56 202.62.75.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.94.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.86.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.68.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.66.0/24 AS17483
Oct 17, 07:16 UTC 56 103.5.16.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.81.0/24 AS17483
Oct 17, 07:16 UTC 56 195.191.226.0/24 AS41775
Oct 17, 07:16 UTC 56 45.123.25.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.90.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.69.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.64.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.93.0/24 AS17483
Oct 17, 07:16 UTC 58 45.71.73.0/24 AS267597
Oct 17, 07:16 UTC 56 202.62.65.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.84.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.72.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.73.0/24 AS17483
Oct 17, 07:16 UTC 58 66.102.124.0/24 AS150671
Oct 17, 07:16 UTC 56 202.62.85.0/24 AS17483
Oct 17, 07:16 UTC 56 202.62.89.0/24 AS17483
Oct 17, 06:16 UTC 56 203.189.140.0/24 AS23673
Oct 17, 06:16 UTC 56 203.189.159.0/24 AS23673
Oct 17, 06:16 UTC 56 203.189.135.0/24 AS23673
Oct 17, 05:16 UTC 56 31.128.208.0/22 AS48738
Oct 17, 05:16 UTC 56 95.26.234.0/24 AS3216
Oct 17, 05:16 UTC 56 92.240.210.0/23 AS39735
Oct 17, 05:16 UTC 56 89.188.250.0/24 AS20533
Oct 17, 05:16 UTC 56 95.25.208.0/23 AS3216
Oct 17, 05:16 UTC 56 95.25.206.0/23 AS3216
Oct 17, 05:16 UTC 56 89.188.236.0/24 AS20533
Oct 17, 05:16 UTC 56 31.128.194.0/23 AS48738
Oct 17, 05:16 UTC 56 89.188.241.0/24 AS20533
Oct 17, 05:16 UTC 56 95.30.19.0/24 AS3216
Oct 17, 05:16 UTC 56 198.54.156.0/22 AS3741
Oct 17, 05:16 UTC 56 41.133.192.0/18 AS20011
Oct 17, 05:16 UTC 56 95.143.8.0/23 AS215182
Oct 17, 05:16 UTC 56 95.131.229.0/24 AS20533
Oct 17, 05:16 UTC 56 196.4.71.0/24 AS3741
Oct 17, 05:16 UTC 56 89.38.164.0/24 AS35168
Oct 17, 05:16 UTC 56 217.148.192.0/24 AS20533
Oct 17, 05:16 UTC 56 89.188.240.0/24 AS20533
Oct 17, 05:16 UTC 56 31.128.204.0/22 AS48738
Oct 17, 05:16 UTC 56 217.148.201.0/24 AS20533
Oct 17, 05:16 UTC 56 95.26.168.0/23 AS3216
Oct 17, 05:16 UTC 56 196.13.213.0/24 AS3741
Oct 17, 05:16 UTC 56 217.148.207.0/24 AS20533
Oct 17, 05:16 UTC 56 89.188.230.0/24 AS20533
Oct 17, 05:16 UTC 56 95.25.160.0/22 AS3216
Oct 17, 05:16 UTC 56 31.128.196.0/22 AS48738
Oct 17, 05:16 UTC 56 95.26.231.0/24 AS3216
Oct 17, 05:16 UTC 56 102.220.36.0/22 AS328475
Oct 17, 05:16 UTC 56 95.25.164.0/22 AS3216
Oct 17, 05:16 UTC 56 102.207.68.0/22 AS328475
Oct 17, 05:16 UTC 58 45.228.236.0/22 AS267125
Oct 17, 05:16 UTC 56 217.148.205.0/24 AS20533
Oct 17, 05:16 UTC 56 89.188.224.0/24 AS20533
Oct 17, 05:16 UTC 56 41.135.0.0/20 AS20011
Oct 17, 05:16 UTC 56 89.188.228.0/24 AS20533
Oct 17, 05:16 UTC 56 95.26.164.0/23 AS3216
Oct 17, 05:16 UTC 56 89.188.231.0/24 AS20533
Oct 17, 05:16 UTC 56 95.26.232.0/24 AS3216
Oct 17, 05:16 UTC 56 89.188.254.0/24 AS20533
Oct 17, 05:16 UTC 56 89.188.238.0/24 AS20533
Oct 17, 05:16 UTC 56 95.26.170.0/23 AS3216
Oct 17, 05:16 UTC 58 170.84.24.0/23 AS265029
Oct 17, 05:16 UTC 56 198.54.163.0/24 AS3741
Oct 17, 05:16 UTC 56 81.28.244.0/24 AS51538
Oct 17, 05:16 UTC 56 31.128.220.0/22 AS48738
Oct 17, 05:16 UTC 56 217.148.200.0/24 AS20533
Oct 17, 05:16 UTC 56 95.26.166.0/23 AS3216
Oct 17, 05:16 UTC 56 89.188.245.0/24 AS20533
Oct 17, 05:16 UTC 56 95.26.233.0/24 AS3216
Oct 17, 05:16 UTC 56 89.188.229.0/24 AS20533
Oct 17, 05:16 UTC 56 95.25.214.0/23 AS3216
Oct 17, 05:16 UTC 56 196.3.163.0/24 AS3741
Oct 17, 05:16 UTC 56 89.188.255.0/24 AS20533
Oct 17, 05:16 UTC 56 89.188.239.0/24 AS20533
Oct 17, 05:16 UTC 56 196.10.104.0/24 AS3741
Oct 17, 05:16 UTC 56 109.71.200.0/22 AS3216
Oct 17, 05:16 UTC 56 95.131.226.0/24 AS20533
Oct 17, 05:16 UTC 56 217.148.199.0/24 AS20533
Oct 17, 05:16 UTC 56 217.148.202.0/24 AS20533
Oct 17, 05:16 UTC 56 89.188.244.0/24 AS20533
Oct 17, 05:16 UTC 56 95.25.204.0/23 AS3216
Oct 17, 05:16 UTC 56 89.188.248.0/24 AS20533
Oct 17, 05:16 UTC 56 95.26.160.0/23 AS3216
Oct 17, 05:16 UTC 56 217.148.198.0/24 AS20533
Oct 17, 05:16 UTC 56 217.148.192.0/20 AS20533
Oct 17, 05:16 UTC 58 45.228.238.0/23 AS267125
Oct 17, 05:16 UTC 56 89.188.251.0/24 AS20533
Oct 17, 05:16 UTC 56 217.148.204.0/24 AS20533
Oct 17, 05:16 UTC 56 95.25.210.0/23 AS3216
Oct 17, 05:16 UTC 56 89.188.234.0/24 AS20533
Oct 17, 05:16 UTC 56 217.148.203.0/24 AS20533
Oct 17, 05:16 UTC 56 31.128.192.0/22 AS48738
Oct 17, 05:16 UTC 56 46.8.54.0/23 AS58238
Oct 17, 05:16 UTC 56 92.240.212.0/23 AS39735
Oct 17, 05:16 UTC 56 192.96.133.0/24 AS3741
Oct 17, 05:16 UTC 56 95.26.194.0/23 AS3216
Oct 17, 05:16 UTC 56 217.148.206.0/24 AS20533
Oct 17, 05:16 UTC 56 95.131.227.0/24 AS20533
Oct 17, 05:16 UTC 56 93.157.174.0/24 AS49403
Oct 17, 05:16 UTC 56 89.188.225.0/24 AS20533
Oct 17, 05:16 UTC 56 196.4.184.0/22 AS3741
Oct 17, 05:16 UTC 56 165.165.0.0/16 AS5713

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 2026-10-17 09:00 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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