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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 5,105 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 18, 01:17 UTC 56 23.90.186.0/23 AS21859
Oct 18, 00:16 UTC 56 200.47.106.0/23 AS7908
Oct 18, 00:16 UTC 56 200.47.126.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.162.0/24 AS7908
Oct 18, 00:16 UTC 56 38.253.94.0/24 AS174
Oct 18, 00:16 UTC 56 200.47.90.0/23 AS7908
Oct 18, 00:16 UTC 56 200.47.167.0/24 AS7908
Oct 18, 00:16 UTC 56 38.253.91.0/24 AS174
Oct 18, 00:16 UTC 56 200.47.64.0/21 AS7908
Oct 18, 00:16 UTC 56 200.47.116.0/23 AS7908
Oct 18, 00:16 UTC 56 200.47.165.0/24 AS7908
Oct 18, 00:16 UTC 58 177.154.115.0/24 AS262959
Oct 18, 00:16 UTC 56 103.231.240.0/24 AS133498
Oct 18, 00:16 UTC 58 177.154.112.0/24 AS262959
Oct 18, 00:16 UTC 56 200.47.56.0/21 AS7908
Oct 18, 00:16 UTC 56 200.47.62.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.105.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.87.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.248.0/21 AS7908
Oct 18, 00:16 UTC 56 170.83.25.0/24 AS266451
Oct 18, 00:16 UTC 56 200.47.192.0/21 AS7908
Oct 18, 00:16 UTC 56 200.47.50.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.168.0/24 AS7908
Oct 18, 00:16 UTC 56 38.253.89.0/24 AS174
Oct 18, 00:16 UTC 56 200.47.240.0/21 AS7908
Oct 18, 00:16 UTC 56 200.47.93.0/24 AS7908
Oct 18, 00:16 UTC 56 38.253.93.0/24 AS174
Oct 18, 00:16 UTC 56 200.47.148.0/24 AS7908
Oct 18, 00:16 UTC 56 38.253.90.0/24 AS174
Oct 18, 00:16 UTC 56 200.47.80.0/22 AS7908
Oct 18, 00:16 UTC 56 200.47.100.0/22 AS7908
Oct 18, 00:16 UTC 58 168.196.199.0/24 AS270980
Oct 18, 00:16 UTC 56 200.47.196.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.74.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.163.0/24 AS7908
Oct 18, 00:16 UTC 58 168.196.196.0/22 AS270980
Oct 18, 00:16 UTC 56 103.231.242.0/24 AS133498
Oct 18, 00:16 UTC 58 200.106.210.0/24 AS271248
Oct 18, 00:16 UTC 56 200.47.104.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.161.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.122.0/23 AS7908
Oct 18, 00:16 UTC 56 202.92.130.0/24 AS23862
Oct 18, 00:16 UTC 56 200.47.232.0/21 AS7908
Oct 18, 00:16 UTC 56 200.47.92.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.49.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.50.0/23 AS7908
Oct 18, 00:16 UTC 56 38.253.92.0/24 AS174
Oct 18, 00:16 UTC 56 202.92.140.0/24 AS135162
Oct 18, 00:16 UTC 56 200.47.200.0/21 AS7908
Oct 18, 00:16 UTC 56 200.47.109.0/24 AS7908
Oct 18, 00:16 UTC 56 102.135.181.0/24 AS16509
Oct 18, 00:16 UTC 56 200.47.86.0/24 AS7908
Oct 18, 00:16 UTC 56 200.47.119.0/24 AS7908
Oct 17, 23:16 UTC 56 151.241.144.0/24 AS209630
Oct 17, 23:16 UTC 56 193.3.20.0/24 AS215762
Oct 17, 23:16 UTC 56 81.31.195.0/24 AS208220
Oct 17, 23:16 UTC 58 177.177.224.0/24 AS60326
Oct 17, 23:16 UTC 56 91.204.16.0/22 AS39775
Oct 17, 23:16 UTC 56 5.253.86.0/24 AS213438
Oct 17, 23:16 UTC 56 81.90.208.0/20 AS39775
Oct 17, 23:16 UTC 56 92.60.77.0/24 AS214557
Oct 17, 23:16 UTC 56 181.215.186.0/24 AS209630
Oct 17, 23:16 UTC 56 181.215.41.0/24 AS209630
Oct 17, 23:16 UTC 56 217.60.101.0/24 AS208220
Oct 17, 23:16 UTC 58 192.245.88.0/24 AS393216
Oct 17, 23:16 UTC 56 87.121.84.0/24 AS197170
Oct 17, 23:16 UTC 58 177.177.225.0/24 AS60326
Oct 17, 23:16 UTC 56 46.23.108.0/24 AS215762
Oct 17, 23:16 UTC 56 193.142.146.0/24 AS213438
Oct 17, 23:16 UTC 56 192.109.138.0/24 AS213438
Oct 17, 23:16 UTC 56 141.11.69.0/24 AS215097
Oct 17, 23:16 UTC 56 45.129.230.0/23 AS213438
Oct 17, 23:16 UTC 56 151.243.11.0/24 AS209630
Oct 17, 23:16 UTC 56 178.215.227.0/24 AS211443
Oct 17, 23:16 UTC 56 185.148.76.0/24 AS204818
Oct 17, 23:16 UTC 56 193.142.147.0/24 AS213438
Oct 17, 23:16 UTC 56 93.123.118.0/24 AS209630
Oct 17, 23:16 UTC 56 81.31.194.0/24 AS208220
Oct 17, 23:16 UTC 56 181.214.125.0/24 AS209630
Oct 17, 23:16 UTC 56 93.152.233.0/24 AS211443
Oct 17, 23:16 UTC 58 138.249.75.0/24 AS44559
Oct 17, 23:16 UTC 56 45.134.225.0/24 AS213438
Oct 17, 23:16 UTC 56 79.124.8.0/24 AS213438
Oct 17, 23:16 UTC 56 93.152.219.0/24 AS213438
Oct 17, 23:16 UTC 56 38.224.202.0/24 AS174
Oct 17, 23:16 UTC 56 196.32.227.0/24 AS37210
Oct 17, 23:16 UTC 56 185.196.220.0/24 AS213438
Oct 17, 23:16 UTC 56 31.58.249.0/24 AS213438
Oct 17, 23:16 UTC 60 194.126.38.0/24 AS25122
Oct 17, 23:16 UTC 56 92.60.79.0/24 AS215762
Oct 17, 23:16 UTC 56 31.56.110.0/24 AS213438
Oct 17, 23:16 UTC 58 208.73.214.0/24 AS60326
Oct 17, 23:16 UTC 56 5.253.84.0/24 AS213438
Oct 17, 23:16 UTC 56 109.205.214.0/24 AS203363
Oct 17, 23:16 UTC 56 94.156.167.0/24 AS208220
Oct 17, 23:16 UTC 56 194.87.14.0/24 AS201409
Oct 17, 23:16 UTC 58 45.178.169.0/24 AS269041
Oct 17, 23:16 UTC 56 193.142.59.0/24 AS201409
Oct 17, 23:16 UTC 56 185.190.26.0/24 AS207616
Oct 17, 23:16 UTC 60 45.125.228.0/24 AS133880
Oct 17, 23:16 UTC 56 217.60.79.0/24 AS213438
Oct 17, 23:16 UTC 58 45.178.168.0/24 AS269041
Oct 17, 23:16 UTC 56 185.190.0.0/22 AS39775
Oct 17, 23:16 UTC 58 45.178.170.0/23 AS273438
Oct 17, 23:16 UTC 56 78.142.18.0/24 AS213438
Oct 17, 23:16 UTC 56 78.41.139.0/24 AS201409
Oct 17, 23:16 UTC 56 62.192.32.0/19 AS39775
Oct 17, 23:16 UTC 58 45.178.168.0/23 AS269041
Oct 17, 23:16 UTC 56 91.92.41.0/24 AS211443
Oct 17, 23:16 UTC 56 185.14.156.0/22 AS3250
Oct 17, 23:16 UTC 56 87.120.127.0/24 AS208220
Oct 17, 23:16 UTC 58 8.225.193.0/24 AS46887
Oct 17, 23:16 UTC 56 50.118.225.0/24 AS213438
Oct 17, 23:16 UTC 56 87.232.84.0/24 AS214557
Oct 17, 23:16 UTC 56 38.224.195.0/24 AS174
Oct 17, 22:16 UTC 56 189.142.80.0/21 AS8151
Oct 17, 22:16 UTC 56 187.230.144.0/21 AS8151
Oct 17, 22:16 UTC 56 95.27.68.0/23 AS3216
Oct 17, 22:16 UTC 60 177.66.98.0/23 AS262491
Oct 17, 22:16 UTC 58 170.238.72.0/24 AS264496
Oct 17, 22:16 UTC 56 201.161.1.0/24 AS32098
Oct 17, 22:16 UTC 56 104.23.170.0/24 AS13335
Oct 17, 22:16 UTC 58 45.186.231.0/24 AS269439
Oct 17, 22:16 UTC 56 13.227.199.0/24 AS16509
Oct 17, 22:16 UTC 58 177.38.14.0/23 AS262893
Oct 17, 22:16 UTC 56 45.58.112.0/24 AS23470
Oct 17, 22:16 UTC 56 187.148.200.0/21 AS8151
Oct 17, 22:16 UTC 58 186.211.106.0/24 AS53062
Oct 17, 22:16 UTC 56 143.105.154.0/23 AS14593
Oct 17, 22:16 UTC 56 153.67.148.0/23 AS14593
Oct 17, 22:16 UTC 56 201.114.128.0/19 AS8151
Oct 17, 22:16 UTC 58 143.255.207.0/24 AS264496
Oct 17, 22:16 UTC 56 99.239.128.0/18 AS812
Oct 17, 22:16 UTC 56 187.136.8.0/21 AS8151
Oct 17, 22:16 UTC 56 177.44.124.0/22 AS28202
Oct 17, 22:16 UTC 56 72.136.112.0/23 AS812
Oct 17, 22:16 UTC 56 131.255.59.0/24 AS271253
Oct 17, 22:16 UTC 58 177.137.254.0/23 AS267301
Oct 17, 22:16 UTC 56 189.131.2.0/24 AS8151
Oct 17, 22:16 UTC 56 173.32.254.0/23 AS812
Oct 17, 22:16 UTC 56 18.244.60.0/22 AS16509
Oct 17, 22:16 UTC 56 213.111.136.0/23 AS56630
Oct 17, 22:16 UTC 56 187.234.14.0/23 AS8151
Oct 17, 22:16 UTC 58 177.38.8.0/24 AS262893
Oct 17, 22:16 UTC 56 201.174.127.0/24 AS32098
Oct 17, 22:16 UTC 56 3.168.138.0/24 AS16509
Oct 17, 22:16 UTC 56 185.157.44.0/24 AS9125
Oct 17, 22:16 UTC 56 88.148.31.0/24 AS29119
Oct 17, 22:16 UTC 58 177.66.149.0/24 AS52847
Oct 17, 22:16 UTC 56 201.161.50.0/24 AS32098
Oct 17, 22:16 UTC 56 46.31.235.0/24 AS16552
Oct 17, 22:16 UTC 56 200.66.108.0/24 AS32098
Oct 17, 22:16 UTC 62 45.190.72.0/24 AS269702
Oct 17, 22:16 UTC 56 213.221.64.0/18 AS8426
Oct 17, 22:16 UTC 56 187.146.232.0/21 AS8151
Oct 17, 22:16 UTC 56 23.199.45.0/24 AS20940
Oct 17, 22:16 UTC 56 201.161.54.0/24 AS32098
Oct 17, 22:16 UTC 58 201.33.146.0/24 AS11993
Oct 17, 22:16 UTC 56 81.199.193.0/24 AS12491
Oct 17, 22:16 UTC 56 187.230.204.0/23 AS8151
Oct 17, 22:16 UTC 56 187.146.54.0/24 AS8151
Oct 17, 22:16 UTC 56 18.244.64.0/21 AS16509
Oct 17, 22:16 UTC 56 187.152.192.0/19 AS8151
Oct 17, 22:16 UTC 56 168.205.241.0/24 AS262494
Oct 17, 22:16 UTC 56 153.72.107.0/24 AS31898
Oct 17, 22:16 UTC 56 189.233.212.0/24 AS8151
Oct 17, 22:16 UTC 56 187.139.146.0/24 AS8151
Oct 17, 22:16 UTC 56 23.209.69.0/24 AS20940
Oct 17, 22:16 UTC 56 196.43.99.0/24 AS37183
Oct 17, 22:16 UTC 56 200.66.109.0/24 AS32098
Oct 17, 22:16 UTC 58 177.47.87.0/24 AS262480
Oct 17, 22:16 UTC 58 177.66.148.0/24 AS52847
Oct 17, 22:16 UTC 56 45.84.220.0/24 AS201178
Oct 17, 22:16 UTC 56 169.159.170.0/24 AS328471
Oct 17, 22:16 UTC 56 143.105.36.0/23 AS14593
Oct 17, 22:16 UTC 56 201.161.35.0/24 AS32098
Oct 17, 22:16 UTC 56 91.198.65.0/24 AS29119
Oct 17, 22:16 UTC 56 5.42.255.0/24 AS35753
Oct 17, 22:16 UTC 56 99.86.243.0/24 AS16509
Oct 17, 22:16 UTC 58 45.224.32.0/22 AS266924
Oct 17, 22:16 UTC 58 45.136.146.0/23 AS208677
Oct 17, 22:16 UTC 58 168.121.112.0/22 AS265311
Oct 17, 22:16 UTC 58 104.22.44.0/24 AS13335
Oct 17, 22:16 UTC 56 194.226.214.0/23 AS3267
Oct 17, 22:16 UTC 56 59.98.192.0/20 AS9829
Oct 17, 22:16 UTC 56 152.65.232.0/24 AS15169
Oct 17, 22:16 UTC 56 3.165.124.0/24 AS16509
Oct 17, 22:16 UTC 56 201.96.116.0/24 AS8151
Oct 17, 22:16 UTC 58 177.38.11.0/24 AS262893
Oct 17, 22:16 UTC 56 201.99.37.0/24 AS8151
Oct 17, 22:16 UTC 58 131.196.169.0/24 AS265915
Oct 17, 22:16 UTC 56 102.176.93.0/24 AS29614
Oct 17, 22:16 UTC 58 172.68.226.0/24 AS13335
Oct 17, 22:16 UTC 56 201.172.138.0/24 AS11888
Oct 17, 22:16 UTC 58 170.238.73.0/24 AS264496
Oct 17, 22:16 UTC 56 131.255.58.0/24 AS271253
Oct 17, 22:16 UTC 56 3.164.170.0/24 AS16509
Oct 17, 22:16 UTC 56 185.119.43.0/24 AS54994
Oct 17, 22:16 UTC 56 23.39.51.0/24 AS20940
Oct 17, 22:16 UTC 56 173.35.6.0/23 AS812

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 2026-10-18 01:30 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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