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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 840 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Aug 29, 19:56 UTC 56 177.38.43.0/24 AS52941
Aug 29, 19:56 UTC 58 148.206.52.0/24 AS3596
Aug 29, 19:56 UTC 56 31.132.64.0/21 AS56945
Aug 29, 19:56 UTC 58 148.206.57.0/24 AS3596
Aug 29, 19:56 UTC 56 185.151.74.0/24 AS47322
Aug 29, 19:56 UTC 56 195.238.245.0/24 AS34730
Aug 29, 19:56 UTC 58 148.206.46.0/24 AS3596
Aug 29, 19:56 UTC 56 82.177.201.0/24 AS42246
Aug 29, 19:56 UTC 56 82.177.202.0/23 AS206442
Aug 29, 19:56 UTC 56 41.190.86.0/23 AS37026
Aug 29, 19:56 UTC 56 45.130.209.0/24 AS34903
Aug 29, 19:56 UTC 58 148.206.62.0/24 AS3596
Aug 29, 19:56 UTC 56 164.160.46.0/23 AS328032
Aug 29, 19:56 UTC 58 148.206.43.0/24 AS3596
Aug 29, 19:56 UTC 58 148.206.45.0/24 AS3596
Aug 29, 19:56 UTC 56 177.38.45.0/24 AS52941
Aug 29, 19:56 UTC 56 88.220.88.0/24 AS215652
Aug 29, 19:56 UTC 56 185.202.124.0/24 AS198595
Aug 29, 19:56 UTC 56 193.200.216.0/24 AS43062
Aug 29, 19:56 UTC 58 148.206.61.0/24 AS3596
Aug 29, 19:56 UTC 56 88.220.51.0/24 AS209296
Aug 29, 19:56 UTC 56 101.53.254.0/24 AS9541
Aug 29, 19:56 UTC 58 148.206.40.0/24 AS3596
Aug 29, 19:56 UTC 56 91.217.228.0/24 AS24732
Aug 29, 19:56 UTC 56 193.16.107.0/24 AS31528
Aug 29, 19:56 UTC 56 78.41.24.0/21 AS48022
Aug 29, 19:56 UTC 56 193.105.20.0/24 AS50423
Aug 29, 19:56 UTC 56 160.20.24.0/22 AS328032
Aug 29, 19:56 UTC 56 88.220.90.0/24 AS212305
Aug 29, 19:56 UTC 56 193.28.0.0/24 AS30730
Aug 29, 19:56 UTC 56 91.216.202.0/24 AS197135
Aug 29, 19:56 UTC 56 193.108.177.0/24 AS47322
Aug 29, 19:56 UTC 56 82.177.30.0/23 AS199260
Aug 29, 19:56 UTC 56 82.177.128.0/24 AS206093
Aug 29, 19:56 UTC 56 195.182.20.0/24 AS58288
Aug 29, 19:56 UTC 56 88.220.84.0/24 AS204301
Aug 29, 19:56 UTC 56 91.209.153.0/24 AS41253
Aug 29, 19:56 UTC 56 145.237.4.0/24 AS34339
Aug 29, 19:56 UTC 56 88.220.82.0/23 AS201904
Aug 29, 19:56 UTC 56 185.255.252.0/22 AS199390
Aug 29, 19:56 UTC 58 148.206.51.0/24 AS3596
Aug 29, 19:56 UTC 58 148.206.54.0/24 AS3596
Aug 29, 19:56 UTC 56 195.234.164.0/24 AS204953
Aug 29, 19:56 UTC 56 91.224.144.0/23 AS56752
Aug 29, 19:56 UTC 56 177.38.46.0/24 AS52941
Aug 29, 19:56 UTC 62 181.232.170.0/23 AS271352
Aug 29, 19:56 UTC 58 148.206.38.0/24 AS3596
Aug 29, 19:56 UTC 56 145.237.0.0/16 AS34339
Aug 29, 19:56 UTC 56 195.136.79.0/24 AS39437
Aug 29, 19:56 UTC 56 89.238.0.0/18 AS41356
Aug 29, 19:56 UTC 56 194.49.104.0/24 AS56373
Aug 29, 19:56 UTC 56 81.15.237.0/24 AS203279
Aug 29, 19:56 UTC 56 217.79.144.0/23 AS42923
Aug 29, 19:56 UTC 56 92.63.32.0/20 AS49633
Aug 29, 19:56 UTC 58 148.206.37.0/24 AS3596
Aug 29, 19:56 UTC 56 88.199.162.0/24 AS42923
Aug 29, 19:56 UTC 56 91.198.194.0/24 AS43867
Aug 29, 19:56 UTC 56 193.178.132.0/24 AS29536
Aug 29, 19:56 UTC 56 157.25.57.0/24 AS206770
Aug 29, 19:56 UTC 56 83.168.93.0/24 AS2115
Aug 29, 19:56 UTC 56 82.177.36.0/24 AS44284
Aug 29, 19:56 UTC 56 185.18.132.0/22 AS199390
Aug 29, 19:56 UTC 58 148.206.32.0/24 AS3596
Aug 29, 19:56 UTC 56 91.236.57.0/24 AS198595
Aug 29, 19:56 UTC 56 192.68.51.0/24 AS198743
Aug 29, 19:56 UTC 56 145.237.0.0/17 AS34339
Aug 29, 19:56 UTC 58 148.206.34.0/24 AS3596
Aug 29, 19:56 UTC 58 148.206.58.0/24 AS3596
Aug 29, 19:56 UTC 56 158.66.1.0/24 AS21111
Aug 29, 19:56 UTC 56 45.169.215.0/24 AS52941
Aug 29, 19:56 UTC 56 91.235.16.0/22 AS204295
Aug 29, 19:56 UTC 56 91.223.68.0/24 AS2115
Aug 29, 19:56 UTC 56 81.15.196.0/24 AS212987
Aug 29, 19:56 UTC 56 185.41.94.0/23 AS199953
Aug 29, 19:56 UTC 58 148.206.42.0/24 AS3596
Aug 29, 19:56 UTC 56 45.130.208.0/22 AS34903
Aug 29, 19:56 UTC 56 192.162.44.0/22 AS197682
Aug 29, 19:56 UTC 56 195.182.35.0/24 AS47290
Aug 29, 19:56 UTC 58 148.206.49.0/24 AS3596
Aug 29, 19:56 UTC 56 196.41.96.0/19 AS36874
Aug 29, 19:56 UTC 56 196.22.240.0/20 AS36874
Aug 29, 19:56 UTC 56 145.237.221.0/24 AS34339
Aug 29, 19:56 UTC 56 91.231.92.0/24 AS47672
Aug 29, 19:56 UTC 56 158.66.4.0/24 AS21111
Aug 29, 19:56 UTC 56 195.136.2.0/23 AS51393
Aug 29, 19:56 UTC 56 45.130.208.0/24 AS34903
Aug 29, 19:56 UTC 56 85.198.248.0/22 AS208556
Aug 29, 19:56 UTC 56 145.237.224.0/19 AS34339
Aug 29, 19:56 UTC 56 158.66.5.0/24 AS21111
Aug 29, 19:56 UTC 56 105.233.0.0/16 AS36874
Aug 29, 19:56 UTC 56 145.237.222.0/24 AS34339
Aug 29, 19:56 UTC 56 80.241.128.0/21 AS16296
Aug 29, 19:56 UTC 56 88.220.71.0/24 AS199694
Aug 29, 19:56 UTC 56 164.160.44.0/23 AS328032
Aug 29, 19:56 UTC 56 88.220.164.0/24 AS209388
Aug 29, 19:56 UTC 56 46.148.132.0/22 AS44056
Aug 29, 19:56 UTC 56 45.169.214.0/24 AS52941
Aug 29, 19:56 UTC 56 185.202.126.0/24 AS198595
Aug 29, 19:56 UTC 56 194.49.106.0/24 AS56373
Aug 29, 19:56 UTC 58 148.206.47.0/24 AS3596
Aug 29, 19:56 UTC 56 41.217.205.0/24 AS37125
Aug 29, 19:56 UTC 56 45.130.210.0/24 AS34903
Aug 29, 19:56 UTC 56 194.41.12.0/22 AS25495
Aug 29, 19:56 UTC 56 82.177.56.0/24 AS214802
Aug 29, 19:56 UTC 58 148.206.50.0/24 AS3596
Aug 29, 19:56 UTC 56 81.15.217.0/24 AS205990
Aug 29, 19:56 UTC 56 85.190.245.0/24 AS41455
Aug 29, 19:56 UTC 56 195.136.108.0/24 AS215903
Aug 29, 19:56 UTC 58 148.206.39.0/24 AS3596
Aug 29, 19:56 UTC 56 185.13.144.0/22 AS49633
Aug 29, 19:56 UTC 58 148.206.55.0/24 AS3596
Aug 29, 19:56 UTC 56 177.38.44.0/24 AS52941
Aug 29, 19:56 UTC 56 185.96.8.0/22 AS200792
Aug 29, 19:56 UTC 58 132.248.81.0/24 AS278
Aug 29, 19:56 UTC 56 145.237.160.0/19 AS34339
Aug 29, 19:56 UTC 56 185.151.75.0/24 AS47322
Aug 29, 19:56 UTC 56 81.15.145.0/24 AS205034
Aug 29, 19:56 UTC 56 145.237.128.0/17 AS34339
Aug 29, 19:56 UTC 56 185.106.168.0/22 AS49633
Aug 29, 19:56 UTC 56 91.239.205.0/24 AS198835
Aug 29, 19:56 UTC 56 88.220.72.0/24 AS199823
Aug 29, 19:56 UTC 58 148.206.53.0/24 AS3596
Aug 29, 19:56 UTC 56 46.231.152.0/21 AS34999
Aug 29, 19:56 UTC 56 81.15.191.0/24 AS204301
Aug 29, 19:56 UTC 56 88.220.55.0/24 AS213530
Aug 29, 19:56 UTC 58 148.206.60.0/24 AS3596
Aug 29, 19:56 UTC 56 195.136.176.0/22 AS199390
Aug 29, 19:56 UTC 58 148.206.41.0/24 AS3596
Aug 29, 19:56 UTC 58 148.206.48.0/24 AS3596
Aug 29, 19:56 UTC 56 185.32.48.0/24 AS200244
Aug 29, 19:56 UTC 56 158.66.2.0/24 AS21111
Aug 29, 19:56 UTC 56 185.202.127.0/24 AS198595
Aug 29, 19:56 UTC 56 5.172.190.0/23 AS207012
Aug 29, 19:56 UTC 56 82.177.204.0/24 AS50625
Aug 29, 19:56 UTC 56 158.66.0.0/16 AS21111
Aug 29, 19:56 UTC 56 195.182.52.0/24 AS47322
Aug 29, 19:56 UTC 56 195.182.9.0/24 AS39171
Aug 29, 19:56 UTC 58 148.206.36.0/24 AS3596
Aug 29, 19:56 UTC 58 148.206.44.0/24 AS3596
Aug 29, 19:56 UTC 56 177.38.47.0/24 AS52941
Aug 29, 19:56 UTC 56 145.237.192.0/19 AS34339
Aug 29, 19:56 UTC 56 82.177.190.0/24 AS197903
Aug 29, 19:56 UTC 58 148.206.56.0/24 AS3596
Aug 29, 19:56 UTC 56 185.41.92.0/24 AS199953
Aug 29, 19:56 UTC 56 194.165.54.0/24 AS39243
Aug 29, 19:56 UTC 56 194.0.199.0/24 AS42966
Aug 29, 19:56 UTC 56 193.43.12.0/23 AS204295
Aug 29, 19:56 UTC 56 88.220.138.0/24 AS210587
Aug 29, 19:56 UTC 56 158.66.6.0/24 AS21111
Aug 29, 19:56 UTC 56 41.177.0.0/16 AS36874
Aug 29, 19:56 UTC 56 145.237.3.0/24 AS34339
Aug 29, 19:56 UTC 56 91.218.196.0/22 AS51393
Aug 29, 19:56 UTC 56 81.15.155.0/24 AS211388
Aug 29, 19:56 UTC 56 217.79.146.0/23 AS42923
Aug 29, 19:56 UTC 56 82.177.195.0/24 AS197142
Aug 29, 19:56 UTC 58 148.206.59.0/24 AS3596
Aug 29, 19:56 UTC 56 177.38.42.0/24 AS52941
Aug 29, 19:56 UTC 56 194.50.110.0/24 AS39661
Aug 29, 18:56 UTC 56 188.172.244.0/24 AS42473
Aug 29, 18:56 UTC 56 185.126.102.0/24 AS61430
Aug 29, 18:56 UTC 56 91.197.148.0/22 AS30975
Aug 29, 18:56 UTC 56 83.145.128.0/18 AS30975
Aug 29, 18:56 UTC 56 91.213.252.0/24 AS61430
Aug 29, 18:56 UTC 56 80.78.133.0/24 AS39083
Aug 29, 18:56 UTC 56 185.237.210.0/24 AS61430
Aug 29, 18:56 UTC 56 45.161.220.0/23 AS268499
Aug 29, 18:56 UTC 56 213.227.180.0/24 AS42473
Aug 29, 18:56 UTC 56 45.164.202.0/23 AS272174
Aug 29, 18:56 UTC 56 185.126.100.0/24 AS61430
Aug 29, 18:56 UTC 56 91.210.131.0/24 AS44279
Aug 29, 18:56 UTC 58 45.129.95.0/24 AS207960
Aug 29, 18:56 UTC 56 91.228.190.0/23 AS61430
Aug 29, 18:56 UTC 56 44.31.126.0/24 AS203478
Aug 29, 18:56 UTC 56 185.126.103.0/24 AS61430
Aug 29, 18:56 UTC 56 185.126.101.0/24 AS61430
Aug 29, 18:56 UTC 56 176.119.217.0/24 AS215385
Aug 29, 18:56 UTC 56 45.161.222.0/23 AS268499
Aug 29, 18:56 UTC 56 80.78.134.0/24 AS50801
Aug 29, 18:56 UTC 56 144.208.220.0/24 AS42473
Aug 29, 18:56 UTC 56 80.78.135.0/24 AS50801
Aug 29, 18:56 UTC 56 194.35.236.0/23 AS49007
Aug 29, 18:56 UTC 56 91.231.178.0/24 AS52142
Aug 29, 18:56 UTC 56 5.231.122.0/24 AS200275
Aug 29, 18:56 UTC 56 195.69.209.0/24 AS25070
Aug 29, 18:56 UTC 56 185.237.211.0/24 AS61430
Aug 29, 18:56 UTC 56 91.210.130.0/24 AS44279
Aug 29, 17:57 UTC 56 154.120.72.0/23 AS37340
Aug 29, 17:57 UTC 58 190.11.210.0/23 AS270652
Aug 29, 17:57 UTC 56 41.217.16.0/23 AS37340
Aug 29, 17:57 UTC 56 213.199.213.0/24 AS25070
Aug 29, 17:57 UTC 58 170.231.208.0/22 AS61621
Aug 29, 17:57 UTC 58 190.11.210.0/24 AS270652
Aug 29, 17:57 UTC 56 193.238.64.0/22 AS31412
Aug 29, 17:57 UTC 56 102.164.37.0/24 AS37125
Aug 29, 17:57 UTC 56 185.247.252.0/24 AS200369
Aug 29, 17:57 UTC 58 94.232.91.0/24 AS48365
Aug 29, 17:57 UTC 56 62.212.160.0/19 AS29081
Aug 29, 17:57 UTC 56 195.167.149.0/24 AS206838
Aug 29, 17:57 UTC 56 195.167.148.0/24 AS206838
Aug 29, 17:57 UTC 56 195.136.121.0/24 AS204412

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 2026-08-29 20:45 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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