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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 1,588 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 17, 02:17 UTC 56 45.183.188.0/22 AS269298
Oct 17, 02:17 UTC 58 177.53.198.0/24 AS274729
Oct 17, 02:17 UTC 56 114.111.58.0/24 AS54994
Oct 17, 02:17 UTC 56 211.43.149.0/24 AS54994
Oct 17, 02:17 UTC 56 108.59.170.0/23 AS31898
Oct 17, 02:17 UTC 56 119.31.254.0/24 AS54994
Oct 17, 01:17 UTC 56 109.235.15.0/24 AS9202
Oct 17, 01:17 UTC 56 192.144.65.0/24 AS266178
Oct 17, 01:17 UTC 56 168.232.136.0/22 AS264943
Oct 17, 01:17 UTC 56 119.82.129.0/24 AS45903
Oct 17, 01:17 UTC 56 42.96.39.0/24 AS45903
Oct 17, 01:17 UTC 56 167.250.60.0/22 AS264943
Oct 17, 01:17 UTC 56 203.171.28.0/23 AS45903
Oct 17, 01:17 UTC 56 179.43.54.0/24 AS270872
Oct 17, 01:17 UTC 56 115.165.166.0/24 AS45903
Oct 17, 01:17 UTC 56 170.231.200.0/22 AS264943
Oct 17, 01:17 UTC 56 101.99.37.0/24 AS45903
Oct 17, 01:17 UTC 56 45.142.89.0/24 AS207123
Oct 17, 01:17 UTC 56 138.97.147.0/24 AS266178
Oct 17, 01:17 UTC 56 203.205.7.0/24 AS45903
Oct 17, 01:17 UTC 56 103.63.110.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.47.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.1.0/24 AS45903
Oct 17, 01:17 UTC 56 162.4.9.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.2.0/24 AS45903
Oct 17, 01:17 UTC 56 192.162.140.0/22 AS56610
Oct 17, 01:17 UTC 56 119.82.135.0/24 AS45903
Oct 17, 01:17 UTC 56 183.91.20.0/23 AS45903
Oct 17, 01:17 UTC 56 113.20.118.0/23 AS45903
Oct 17, 01:17 UTC 56 101.99.60.0/23 AS45903
Oct 17, 01:17 UTC 56 170.244.248.0/22 AS264943
Oct 17, 01:17 UTC 58 193.200.36.0/24 AS42620
Oct 17, 01:17 UTC 56 101.237.240.0/24 AS135377
Oct 17, 01:17 UTC 56 138.97.145.0/24 AS266178
Oct 17, 01:17 UTC 56 45.122.255.0/24 AS45903
Oct 17, 01:17 UTC 56 113.20.122.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.45.0/24 AS45903
Oct 17, 01:17 UTC 56 101.99.40.0/24 AS45903
Oct 17, 01:17 UTC 56 140.150.31.0/24 AS54994
Oct 17, 01:17 UTC 56 192.144.67.0/24 AS266178
Oct 17, 01:17 UTC 56 203.205.9.0/24 AS45903
Oct 17, 01:17 UTC 56 101.99.59.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.21.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.63.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.6.0/24 AS45903
Oct 17, 01:17 UTC 56 203.205.37.0/24 AS45903
Oct 17, 01:17 UTC 56 119.82.141.0/24 AS45903
Oct 17, 01:17 UTC 56 82.41.133.0/24 AS213169
Oct 17, 00:16 UTC 56 200.47.78.0/24 AS7908
Oct 17, 00:16 UTC 58 23.142.89.0/24 AS203729
Oct 17, 00:16 UTC 56 200.47.224.0/22 AS7908
Oct 17, 00:16 UTC 56 200.47.168.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.104.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.50.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.148.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.192.0/21 AS7908
Oct 17, 00:16 UTC 56 200.47.107.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.126.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.50.0/23 AS7908
Oct 17, 00:16 UTC 56 85.255.156.0/24 AS43848
Oct 17, 00:16 UTC 56 200.47.240.0/21 AS7908
Oct 17, 00:16 UTC 56 200.47.58.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.96.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.83.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.92.0/22 AS7908
Oct 17, 00:16 UTC 56 85.255.154.0/24 AS43848
Oct 17, 00:16 UTC 56 200.47.248.0/21 AS7908
Oct 17, 00:16 UTC 56 200.47.105.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.112.0/22 AS7908
Oct 17, 00:16 UTC 56 200.47.108.0/22 AS7908
Oct 17, 00:16 UTC 56 200.47.163.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.162.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.123.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.196.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.87.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.100.0/22 AS7908
Oct 17, 00:16 UTC 56 200.47.90.0/23 AS7908
Oct 17, 00:16 UTC 56 200.47.165.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.56.0/21 AS7908
Oct 17, 00:16 UTC 56 200.47.49.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.128.0/21 AS7908
Oct 17, 00:16 UTC 56 200.47.200.0/21 AS7908
Oct 17, 00:16 UTC 56 200.47.108.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.144.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.104.0/23 AS7908
Oct 17, 00:16 UTC 56 200.47.167.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.74.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.55.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.52.0/22 AS7908
Oct 17, 00:16 UTC 56 200.47.80.0/22 AS7908
Oct 17, 00:16 UTC 56 200.47.85.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.109.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.86.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.161.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.127.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.116.0/23 AS7908
Oct 17, 00:16 UTC 56 200.47.98.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.119.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.122.0/23 AS7908
Oct 17, 00:16 UTC 56 200.47.93.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.121.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.106.0/23 AS7908
Oct 17, 00:16 UTC 56 200.47.64.0/21 AS7908
Oct 17, 00:16 UTC 56 200.47.62.0/24 AS7908
Oct 17, 00:16 UTC 56 200.47.232.0/21 AS7908
Oct 17, 00:16 UTC 60 168.90.32.0/24 AS265263
Oct 17, 00:16 UTC 56 200.47.92.0/24 AS7908
Oct 16, 22:16 UTC 56 77.37.42.0/24 AS47583
Oct 16, 22:16 UTC 56 57.69.48.0/24 AS51964
Oct 16, 22:16 UTC 56 198.36.36.0/22 AS5080
Oct 16, 22:16 UTC 56 198.36.32.0/22 AS5080
Oct 16, 22:16 UTC 56 198.36.40.0/23 AS5080
Oct 16, 22:16 UTC 56 81.28.244.0/24 AS51538
Oct 16, 21:16 UTC 56 180.183.232.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.192.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.24.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.48.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.208.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.96.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.64.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.32.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.104.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.224.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.80.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.88.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.56.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.40.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.16.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.112.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.120.0/21 AS138524
Oct 16, 21:16 UTC 56 162.211.133.0/24 AS55263
Oct 16, 21:16 UTC 56 180.183.216.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.200.0/21 AS138524
Oct 16, 21:16 UTC 56 180.183.72.0/21 AS138524
Oct 16, 20:16 UTC 58 187.79.241.0/24 AS63907
Oct 16, 20:16 UTC 58 185.255.89.0/24 AS61173
Oct 16, 20:16 UTC 58 187.79.245.0/24 AS218520
Oct 16, 20:16 UTC 56 128.124.224.0/19 AS21497
Oct 16, 20:16 UTC 58 187.79.242.0/24 AS152627
Oct 16, 20:16 UTC 58 23.188.168.0/24 AS401339
Oct 16, 20:16 UTC 58 187.79.243.0/24 AS152627
Oct 16, 19:16 UTC 58 87.248.240.0/20 AS35807
Oct 16, 19:16 UTC 56 103.134.161.0/24 AS136284
Oct 16, 19:16 UTC 56 102.221.15.0/24 AS328810
Oct 16, 19:16 UTC 56 8.41.203.0/24 AS63427
Oct 16, 19:16 UTC 58 185.84.32.0/23 AS35807
Oct 16, 19:16 UTC 56 103.134.163.0/24 AS136284
Oct 16, 19:16 UTC 56 45.175.73.0/24 AS268888
Oct 16, 19:16 UTC 56 109.125.253.0/24 AS44692
Oct 16, 19:16 UTC 58 88.201.192.0/18 AS35807
Oct 16, 19:16 UTC 56 8.41.193.0/24 AS63427
Oct 16, 19:16 UTC 56 103.121.155.0/24 AS136284
Oct 16, 18:16 UTC 58 177.177.225.0/24 AS60326
Oct 16, 18:16 UTC 56 42.96.51.0/24 AS45903
Oct 16, 18:16 UTC 56 196.208.36.0/22 AS20011
Oct 16, 18:16 UTC 56 203.189.135.0/24 AS23673
Oct 16, 18:16 UTC 56 196.28.192.0/19 AS20011
Oct 16, 18:16 UTC 56 210.214.77.0/24 AS9583
Oct 16, 18:16 UTC 56 164.151.128.0/17 AS37130
Oct 16, 18:16 UTC 56 196.208.48.0/22 AS20011
Oct 16, 18:16 UTC 56 160.116.216.0/22 AS50867
Oct 16, 18:16 UTC 56 196.208.24.0/22 AS20011
Oct 16, 18:16 UTC 56 196.2.28.0/23 AS20011
Oct 16, 18:16 UTC 56 196.208.80.0/22 AS20011
Oct 16, 18:16 UTC 56 196.208.56.0/22 AS20011
Oct 16, 18:16 UTC 56 198.54.10.0/24 AS37130
Oct 16, 18:16 UTC 56 177.72.38.0/23 AS262540
Oct 16, 18:16 UTC 56 196.2.24.0/22 AS20011
Oct 16, 18:16 UTC 56 198.54.3.0/24 AS37130
Oct 16, 18:16 UTC 56 196.208.44.0/22 AS20011
Oct 16, 18:16 UTC 56 164.151.0.0/17 AS37130
Oct 16, 18:16 UTC 56 177.72.36.0/23 AS262540
Oct 16, 18:16 UTC 56 198.54.2.0/24 AS37130
Oct 16, 18:16 UTC 56 113.20.112.0/23 AS45903
Oct 16, 18:16 UTC 56 196.2.16.0/23 AS20011
Oct 16, 18:16 UTC 56 192.96.240.0/24 AS37130
Oct 16, 18:16 UTC 56 192.96.239.0/24 AS37130
Oct 16, 18:16 UTC 56 163.195.0.0/17 AS37130
Oct 16, 18:16 UTC 56 163.195.38.0/24 AS37130
Oct 16, 18:16 UTC 56 196.28.40.0/24 AS20011
Oct 16, 18:16 UTC 56 196.28.46.0/23 AS20011
Oct 16, 18:16 UTC 56 198.54.1.0/24 AS37130
Oct 16, 18:16 UTC 56 196.2.31.0/24 AS20011
Oct 16, 18:16 UTC 56 164.146.0.0/15 AS37130
Oct 16, 18:16 UTC 56 197.101.162.0/23 AS20011
Oct 16, 18:16 UTC 56 185.14.6.0/23 AS42482
Oct 16, 18:16 UTC 58 177.177.224.0/24 AS60326
Oct 16, 18:16 UTC 56 197.101.170.0/23 AS20011
Oct 16, 18:16 UTC 56 196.208.40.0/22 AS20011
Oct 16, 18:16 UTC 56 163.195.128.0/17 AS37130
Oct 16, 18:16 UTC 56 192.96.238.0/24 AS37130
Oct 16, 18:16 UTC 56 163.195.40.0/22 AS37130
Oct 16, 18:16 UTC 56 196.28.40.0/21 AS20011
Oct 16, 18:16 UTC 56 201.168.192.0/18 AS19332
Oct 16, 18:16 UTC 56 163.52.14.0/23 AS45903
Oct 16, 18:16 UTC 56 197.101.134.0/23 AS20011
Oct 16, 18:16 UTC 56 196.208.56.0/21 AS20011
Oct 16, 18:16 UTC 56 192.96.241.0/24 AS37130
Oct 16, 18:16 UTC 56 198.54.8.0/24 AS37130
Oct 16, 18:16 UTC 56 196.2.16.0/21 AS20011

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 03:15 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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