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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 1,003 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Aug 29, 23:57 UTC 56 145.237.0.0/17 AS34339
Aug 29, 23:57 UTC 56 195.136.78.0/24 AS199260
Aug 29, 23:57 UTC 56 185.22.136.0/22 AS199057
Aug 29, 23:57 UTC 58 177.124.32.0/22 AS52861
Aug 29, 23:57 UTC 58 177.93.144.0/22 AS52861
Aug 29, 23:57 UTC 56 81.15.217.0/24 AS205990
Aug 29, 23:57 UTC 56 145.237.128.0/17 AS34339
Aug 29, 23:57 UTC 56 188.172.244.0/24 AS42473
Aug 29, 23:57 UTC 56 103.26.37.0/24 AS133064
Aug 29, 23:57 UTC 56 195.136.158.0/23 AS199260
Aug 29, 23:57 UTC 56 45.130.210.0/24 AS34903
Aug 29, 23:57 UTC 56 5.2.48.0/21 AS41560
Aug 29, 23:57 UTC 56 195.69.209.0/24 AS25070
Aug 29, 23:57 UTC 56 104.23.231.0/24 AS13335
Aug 29, 23:57 UTC 56 151.96.0.0/16 AS8217
Aug 29, 23:57 UTC 58 177.93.148.0/22 AS52861
Aug 29, 23:57 UTC 56 1.55.63.0/24 AS18403
Aug 29, 23:57 UTC 56 185.202.126.0/24 AS198595
Aug 29, 23:57 UTC 58 177.93.146.0/23 AS52861
Aug 29, 23:57 UTC 56 194.41.12.0/22 AS25495
Aug 29, 23:57 UTC 56 46.8.210.0/24 AS204490
Aug 29, 23:57 UTC 56 157.25.57.0/24 AS206770
Aug 29, 23:57 UTC 56 193.178.132.0/24 AS29536
Aug 29, 23:57 UTC 56 109.94.250.0/24 AS50086
Aug 29, 23:57 UTC 56 104.22.132.0/24 AS13335
Aug 29, 23:57 UTC 56 91.210.130.0/24 AS44279
Aug 29, 23:57 UTC 56 45.226.107.0/24 AS267013
Aug 29, 23:57 UTC 56 195.136.76.0/24 AS202403
Aug 29, 23:57 UTC 56 104.22.133.0/24 AS13335
Aug 29, 23:57 UTC 56 103.90.202.0/24 AS136503
Aug 29, 23:57 UTC 56 104.23.215.0/24 AS13335
Aug 29, 23:57 UTC 56 45.12.99.0/24 AS47576
Aug 29, 23:57 UTC 56 88.220.138.0/24 AS210587
Aug 29, 23:57 UTC 56 109.94.241.0/24 AS50086
Aug 29, 23:57 UTC 56 138.0.6.0/24 AS264527
Aug 29, 23:57 UTC 56 145.237.192.0/19 AS34339
Aug 29, 23:57 UTC 56 185.184.126.0/24 AS198704
Aug 29, 23:57 UTC 58 177.124.34.0/23 AS52861
Aug 29, 23:57 UTC 56 91.209.153.0/24 AS41253
Aug 29, 23:57 UTC 56 144.208.220.0/24 AS42473
Aug 29, 23:57 UTC 56 185.202.127.0/24 AS198595
Aug 29, 23:57 UTC 56 185.151.75.0/24 AS47322
Aug 29, 23:57 UTC 56 139.135.220.0/22 AS56207
Aug 29, 23:57 UTC 56 145.237.160.0/19 AS34339
Aug 29, 23:57 UTC 58 177.124.38.0/23 AS52861
Aug 29, 23:57 UTC 56 91.218.196.0/22 AS51393
Aug 29, 23:57 UTC 56 185.247.252.0/24 AS200369
Aug 29, 23:57 UTC 56 88.220.71.0/24 AS199694
Aug 29, 23:57 UTC 56 45.130.208.0/24 AS34903
Aug 29, 23:57 UTC 56 45.130.209.0/24 AS34903
Aug 29, 23:57 UTC 56 45.227.230.0/24 AS271704
Aug 29, 23:57 UTC 56 14.238.12.0/24 AS45899
Aug 29, 23:57 UTC 58 177.124.36.0/22 AS52861
Aug 29, 23:57 UTC 56 91.236.57.0/24 AS198595
Aug 29, 23:57 UTC 56 185.151.74.0/24 AS47322
Aug 29, 23:57 UTC 56 5.2.32.0/21 AS41560
Aug 29, 23:57 UTC 56 91.198.194.0/24 AS43867
Aug 29, 23:57 UTC 56 109.94.245.0/24 AS50086
Aug 29, 23:57 UTC 56 194.49.104.0/24 AS56373
Aug 29, 23:57 UTC 56 194.35.236.0/23 AS49007
Aug 29, 23:57 UTC 56 5.2.58.0/23 AS41560
Aug 29, 23:57 UTC 56 145.237.0.0/16 AS34339
Aug 29, 23:57 UTC 56 88.220.90.0/24 AS212305
Aug 29, 23:57 UTC 56 193.105.20.0/24 AS50423
Aug 29, 23:57 UTC 56 193.108.177.0/24 AS47322
Aug 29, 23:57 UTC 56 185.202.124.0/24 AS198595
Aug 29, 23:57 UTC 56 78.41.24.0/21 AS48022
Aug 29, 23:57 UTC 56 88.220.88.0/24 AS215652
Aug 29, 23:57 UTC 56 91.217.228.0/24 AS24732
Aug 29, 23:57 UTC 56 213.199.213.0/24 AS25070
Aug 29, 23:57 UTC 56 88.220.51.0/24 AS209296
Aug 29, 23:57 UTC 56 195.238.245.0/24 AS34730
Aug 29, 23:57 UTC 56 31.132.64.0/21 AS56945
Aug 29, 23:57 UTC 56 104.22.60.0/24 AS13335
Aug 29, 23:57 UTC 56 109.94.249.0/24 AS50086
Aug 29, 23:57 UTC 56 14.168.12.0/24 AS45899
Aug 29, 23:57 UTC 56 120.28.28.0/24 AS23689
Aug 29, 23:57 UTC 56 104.22.48.0/24 AS13335
Aug 29, 23:57 UTC 58 177.93.148.0/23 AS52861
Aug 29, 23:57 UTC 58 177.124.32.0/21 AS52861
Aug 29, 23:57 UTC 56 109.94.248.0/24 AS50086
Aug 29, 23:57 UTC 56 145.237.4.0/24 AS34339
Aug 29, 23:57 UTC 56 88.220.82.0/23 AS201904
Aug 29, 23:57 UTC 56 213.227.180.0/24 AS42473
Aug 29, 23:57 UTC 56 193.16.107.0/24 AS31528
Aug 29, 23:57 UTC 56 5.100.247.0/24 AS204128
Aug 29, 23:57 UTC 56 92.63.32.0/20 AS49633
Aug 29, 23:57 UTC 56 88.220.84.0/24 AS204301
Aug 29, 23:57 UTC 56 185.255.252.0/22 AS199390
Aug 29, 23:57 UTC 56 194.113.249.0/24 AS211295
Aug 29, 23:57 UTC 62 204.157.236.0/24 AS174
Aug 29, 23:57 UTC 56 185.18.132.0/22 AS199390
Aug 29, 23:57 UTC 56 5.2.44.0/22 AS41560
Aug 29, 23:57 UTC 56 217.79.144.0/23 AS42923
Aug 29, 23:57 UTC 56 88.199.162.0/24 AS42923
Aug 29, 23:57 UTC 56 91.235.16.0/22 AS204295
Aug 29, 23:57 UTC 56 5.254.184.0/21 AS199205
Aug 29, 23:57 UTC 56 185.41.94.0/23 AS199953
Aug 29, 23:57 UTC 56 5.2.56.0/24 AS41560
Aug 29, 23:57 UTC 56 196.22.240.0/20 AS36874
Aug 29, 23:57 UTC 56 195.136.12.0/23 AS199260
Aug 29, 23:57 UTC 56 217.79.146.0/23 AS42923
Aug 29, 23:57 UTC 56 145.237.224.0/19 AS34339
Aug 29, 23:57 UTC 56 120.28.29.0/24 AS23689
Aug 29, 23:57 UTC 56 5.2.57.0/24 AS41560
Aug 29, 23:57 UTC 58 177.93.144.0/21 AS52861
Aug 29, 23:57 UTC 56 46.8.208.0/22 AS204490
Aug 29, 23:57 UTC 56 138.186.239.0/24 AS264527
Aug 29, 23:57 UTC 56 85.190.245.0/24 AS41455
Aug 29, 23:57 UTC 56 185.41.92.0/24 AS199953
Aug 29, 23:57 UTC 56 109.94.240.0/20 AS50086
Aug 29, 23:57 UTC 56 193.238.200.0/22 AS35198
Aug 29, 23:57 UTC 56 109.94.242.0/24 AS50086
Aug 29, 23:57 UTC 56 46.148.132.0/22 AS44056
Aug 29, 23:57 UTC 56 194.49.106.0/24 AS56373
Aug 29, 23:57 UTC 56 195.136.176.0/22 AS199390
Aug 29, 23:57 UTC 56 104.23.216.0/24 AS13335
Aug 29, 23:57 UTC 56 5.172.190.0/23 AS207012
Aug 29, 23:57 UTC 56 104.22.134.0/24 AS13335
Aug 29, 23:57 UTC 56 195.182.52.0/24 AS47322
Aug 29, 23:57 UTC 56 185.32.48.0/24 AS200244
Aug 29, 23:57 UTC 56 145.237.3.0/24 AS34339
Aug 29, 23:57 UTC 56 91.212.86.0/24 AS48963
Aug 29, 23:57 UTC 58 177.124.36.0/23 AS52861
Aug 29, 23:57 UTC 56 196.41.96.0/19 AS36874
Aug 29, 23:57 UTC 56 194.145.229.0/24 AS34212
Aug 29, 23:57 UTC 56 5.2.55.0/24 AS41560
Aug 29, 23:57 UTC 56 194.165.54.0/24 AS39243
Aug 29, 23:57 UTC 56 185.96.8.0/22 AS200792
Aug 29, 23:57 UTC 56 88.220.55.0/24 AS213530
Aug 29, 23:57 UTC 56 193.35.36.0/24 AS198937
Aug 29, 23:57 UTC 56 80.241.128.0/21 AS16296
Aug 29, 23:57 UTC 56 5.2.60.0/22 AS41560
Aug 29, 23:57 UTC 56 88.220.72.0/24 AS199823
Aug 29, 23:57 UTC 58 177.124.32.0/23 AS52861
Aug 29, 23:57 UTC 56 14.238.9.0/24 AS45899
Aug 29, 23:57 UTC 56 105.233.0.0/16 AS36874
Aug 29, 23:57 UTC 58 177.93.144.0/23 AS52861
Aug 29, 23:57 UTC 56 195.136.108.0/24 AS215903
Aug 29, 23:57 UTC 56 195.136.2.0/23 AS51393
Aug 29, 23:57 UTC 56 45.130.208.0/22 AS34903
Aug 29, 22:57 UTC 62 120.50.61.0/24 AS132196
Aug 29, 22:57 UTC 60 120.50.60.0/24 AS132196
Aug 29, 22:57 UTC 60 103.238.124.0/24 AS132196
Aug 29, 22:57 UTC 56 102.222.62.0/24 AS328749
Aug 29, 22:57 UTC 56 91.231.178.0/24 AS52142
Aug 29, 22:57 UTC 60 120.50.50.0/24 AS132196
Aug 29, 22:57 UTC 56 91.197.148.0/22 AS30975
Aug 29, 22:57 UTC 56 177.177.80.0/23 AS204921
Aug 29, 22:57 UTC 60 120.50.63.0/24 AS132196
Aug 29, 22:57 UTC 56 176.119.217.0/24 AS215385
Aug 29, 22:57 UTC 56 83.145.128.0/18 AS30975
Aug 29, 22:57 UTC 56 164.160.44.0/23 AS328032
Aug 29, 22:57 UTC 60 103.238.126.0/24 AS132196
Aug 29, 22:57 UTC 60 120.50.53.0/24 AS132196
Aug 29, 22:57 UTC 60 120.50.54.0/24 AS132196
Aug 29, 22:57 UTC 56 8.31.32.0/20 AS395368
Aug 29, 22:57 UTC 56 104.18.32.0/19 AS13335
Aug 29, 22:57 UTC 56 185.13.144.0/22 AS49633
Aug 29, 22:57 UTC 56 164.160.46.0/23 AS328032
Aug 29, 22:57 UTC 60 120.50.58.0/24 AS132196
Aug 29, 22:57 UTC 60 120.50.51.0/24 AS132196
Aug 29, 22:57 UTC 60 120.50.57.0/24 AS132196
Aug 29, 22:57 UTC 56 91.210.131.0/24 AS44279
Aug 29, 22:57 UTC 60 120.50.56.0/24 AS132196
Aug 29, 22:57 UTC 56 74.114.155.0/24 AS2635
Aug 29, 22:57 UTC 56 160.20.24.0/22 AS328032
Aug 29, 22:57 UTC 56 89.238.0.0/18 AS41356
Aug 29, 22:57 UTC 60 120.50.59.0/24 AS132196
Aug 29, 22:57 UTC 56 38.190.110.0/24 AS212616
Aug 29, 22:57 UTC 56 91.216.202.0/24 AS197135
Aug 29, 22:57 UTC 60 120.50.52.0/24 AS132196
Aug 29, 21:57 UTC 56 88.220.164.0/24 AS209388
Aug 29, 21:57 UTC 56 176.112.92.0/22 AS49124
Aug 29, 21:57 UTC 56 185.106.168.0/22 AS49633
Aug 29, 21:57 UTC 56 81.15.246.0/24 AS25070
Aug 29, 21:57 UTC 56 193.200.216.0/24 AS43062
Aug 29, 21:57 UTC 56 195.150.192.0/22 AS203890
Aug 29, 21:57 UTC 56 158.66.6.0/24 AS21111
Aug 29, 21:57 UTC 56 193.28.0.0/24 AS30730
Aug 29, 21:57 UTC 56 194.106.210.0/23 AS31412
Aug 29, 21:57 UTC 56 158.66.0.0/16 AS21111
Aug 29, 21:57 UTC 56 81.15.237.0/24 AS203279
Aug 29, 21:57 UTC 56 193.238.64.0/22 AS31412
Aug 29, 21:57 UTC 56 193.56.70.0/24 AS25070
Aug 29, 21:57 UTC 56 188.164.144.0/21 AS31608
Aug 29, 21:57 UTC 56 192.68.51.0/24 AS198743
Aug 29, 21:57 UTC 56 82.177.201.0/24 AS42246
Aug 29, 21:57 UTC 56 82.177.195.0/24 AS197142
Aug 29, 21:57 UTC 56 82.177.202.0/23 AS206442
Aug 29, 21:57 UTC 56 82.177.100.0/24 AS43769
Aug 29, 21:57 UTC 56 195.136.121.0/24 AS204412
Aug 29, 21:57 UTC 56 158.66.2.0/24 AS21111
Aug 29, 21:57 UTC 56 158.66.4.0/24 AS21111
Aug 29, 21:57 UTC 56 85.198.248.0/22 AS208556
Aug 29, 21:57 UTC 56 194.50.110.0/24 AS39661
Aug 29, 21:57 UTC 56 81.15.218.0/24 AS207764
Aug 29, 21:57 UTC 56 158.66.5.0/24 AS21111
Aug 29, 21:57 UTC 56 195.238.168.0/22 AS56709
Aug 29, 21:57 UTC 56 193.29.205.0/24 AS31229

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 2026-08-30 00:10 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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