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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 5,024 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 14, 15:16 UTC 56 179.189.19.0/24 AS52630
Oct 14, 15:16 UTC 56 177.23.211.0/24 AS262903
Oct 14, 15:16 UTC 56 189.51.111.0/24 AS263349
Oct 14, 15:16 UTC 56 187.111.139.0/24 AS53121
Oct 14, 15:16 UTC 56 210.18.112.0/24 AS9583
Oct 14, 15:16 UTC 56 138.97.71.0/24 AS264147
Oct 14, 15:16 UTC 56 186.249.31.0/24 AS262463
Oct 14, 15:16 UTC 56 189.51.122.0/24 AS263349
Oct 14, 15:16 UTC 56 202.9.75.0/24 AS55510
Oct 14, 15:16 UTC 56 186.250.236.0/24 AS262821
Oct 14, 15:16 UTC 56 168.90.146.0/23 AS265272
Oct 14, 15:16 UTC 56 177.74.226.0/23 AS263652
Oct 14, 15:16 UTC 56 45.238.86.0/23 AS268329
Oct 14, 15:16 UTC 56 45.190.252.0/23 AS269646
Oct 14, 15:16 UTC 56 177.124.2.0/23 AS262311
Oct 14, 15:16 UTC 56 138.121.116.0/24 AS264295
Oct 14, 15:16 UTC 56 177.85.80.0/23 AS266160
Oct 14, 15:16 UTC 56 170.81.183.0/24 AS53121
Oct 14, 15:16 UTC 56 44.30.104.0/24 AS202858
Oct 14, 15:16 UTC 56 189.51.103.0/24 AS263349
Oct 14, 15:16 UTC 56 168.227.102.0/24 AS52603
Oct 14, 15:16 UTC 56 179.109.61.0/24 AS262903
Oct 14, 15:16 UTC 56 138.97.68.0/23 AS264147
Oct 14, 15:16 UTC 56 186.251.99.0/24 AS262828
Oct 14, 15:16 UTC 56 37.10.57.0/24 AS43996
Oct 14, 15:16 UTC 56 186.232.88.0/23 AS269096
Oct 14, 15:16 UTC 56 177.154.212.0/23 AS262293
Oct 14, 15:16 UTC 56 170.83.51.0/24 AS266471
Oct 14, 15:16 UTC 56 45.235.30.0/24 AS267407
Oct 14, 15:16 UTC 56 138.99.203.0/24 AS264210
Oct 14, 15:16 UTC 56 187.111.128.0/24 AS53121
Oct 14, 15:16 UTC 56 186.251.101.0/24 AS262828
Oct 14, 15:16 UTC 56 187.103.40.0/22 AS17222
Oct 14, 15:16 UTC 56 45.237.247.0/24 AS268296
Oct 14, 15:16 UTC 56 189.51.107.0/24 AS263349
Oct 14, 15:16 UTC 56 45.235.28.0/24 AS267407
Oct 14, 15:16 UTC 56 187.120.183.0/24 AS264013
Oct 14, 15:16 UTC 56 189.51.124.0/24 AS263349
Oct 14, 15:16 UTC 56 189.51.117.0/24 AS263349
Oct 14, 15:16 UTC 56 103.75.161.0/24 AS135760
Oct 14, 15:16 UTC 56 189.51.97.0/24 AS263349
Oct 14, 15:16 UTC 56 45.6.27.0/24 AS266118
Oct 14, 15:16 UTC 56 45.190.254.0/23 AS269646
Oct 14, 15:16 UTC 56 177.87.106.0/23 AS262300
Oct 14, 15:16 UTC 56 45.65.142.0/23 AS263652
Oct 14, 15:16 UTC 56 187.120.187.0/24 AS264013
Oct 14, 15:16 UTC 56 191.36.226.0/23 AS263980
Oct 14, 15:16 UTC 56 179.48.113.0/24 AS271086
Oct 14, 15:16 UTC 56 45.64.195.0/24 AS17625
Oct 14, 15:16 UTC 56 177.85.86.0/23 AS266160
Oct 14, 15:16 UTC 56 179.109.56.0/24 AS262903
Oct 14, 15:16 UTC 56 37.10.56.0/24 AS43996
Oct 14, 15:16 UTC 56 103.75.160.0/24 AS135760
Oct 14, 15:16 UTC 56 45.237.245.0/24 AS268296
Oct 14, 15:16 UTC 56 200.188.217.0/24 AS28590
Oct 14, 15:16 UTC 56 177.74.228.0/23 AS263652
Oct 14, 15:16 UTC 56 45.65.140.0/23 AS263652
Oct 14, 15:16 UTC 56 177.128.92.0/24 AS262805
Oct 14, 15:16 UTC 56 138.36.2.0/24 AS264562
Oct 14, 15:16 UTC 56 177.38.198.0/23 AS262409
Oct 14, 15:16 UTC 56 179.108.26.0/23 AS263267
Oct 14, 15:16 UTC 56 177.86.109.0/24 AS262903
Oct 14, 15:16 UTC 56 187.111.133.0/24 AS53121
Oct 14, 15:16 UTC 56 168.0.32.0/23 AS265222
Oct 14, 15:16 UTC 56 187.111.140.0/24 AS53121
Oct 14, 15:16 UTC 56 45.227.230.0/24 AS271704
Oct 14, 15:16 UTC 56 179.0.46.0/24 AS271408
Oct 14, 15:16 UTC 56 177.86.110.0/24 AS262903
Oct 14, 15:16 UTC 56 189.51.113.0/24 AS263349
Oct 14, 15:16 UTC 56 138.36.0.0/24 AS264562
Oct 14, 15:16 UTC 56 168.90.144.0/23 AS265272
Oct 14, 15:16 UTC 56 189.51.115.0/24 AS263349
Oct 14, 15:16 UTC 56 187.103.44.0/22 AS17222
Oct 14, 15:16 UTC 56 188.242.0.0/15 AS35807
Oct 14, 15:16 UTC 56 164.163.19.0/24 AS265952
Oct 14, 15:16 UTC 56 45.6.26.0/24 AS266118
Oct 14, 15:16 UTC 56 201.159.144.0/24 AS52603
Oct 14, 15:16 UTC 56 45.172.205.0/24 AS268787
Oct 14, 15:16 UTC 56 45.164.203.0/24 AS272174
Oct 14, 15:16 UTC 56 45.179.230.0/24 AS269118
Oct 14, 15:16 UTC 56 45.175.248.0/23 AS269096
Oct 14, 15:16 UTC 56 88.201.128.0/17 AS35807
Oct 14, 15:16 UTC 56 186.227.124.0/24 AS263278
Oct 14, 15:16 UTC 56 187.111.142.0/24 AS53121
Oct 14, 15:16 UTC 56 168.181.153.0/24 AS264295
Oct 14, 15:16 UTC 56 143.0.186.0/24 AS264013
Oct 14, 15:16 UTC 56 177.39.10.0/23 AS269096
Oct 14, 15:16 UTC 56 191.36.224.0/23 AS263980
Oct 14, 15:16 UTC 56 103.67.96.0/24 AS135760
Oct 14, 15:16 UTC 56 168.181.152.0/24 AS264295
Oct 14, 15:16 UTC 56 179.125.24.0/24 AS263626
Oct 14, 15:16 UTC 56 206.42.48.0/20 AS28126
Oct 14, 15:16 UTC 56 138.118.63.0/24 AS264248
Oct 14, 15:16 UTC 56 191.37.21.0/24 AS263349
Oct 14, 15:16 UTC 56 94.19.0.0/16 AS35807
Oct 14, 15:16 UTC 56 177.155.192.0/23 AS262828
Oct 14, 15:16 UTC 56 177.37.26.0/24 AS270675
Oct 14, 15:16 UTC 56 186.65.104.0/23 AS266142
Oct 14, 15:16 UTC 56 45.232.244.0/23 AS263980
Oct 14, 15:16 UTC 56 189.51.120.0/24 AS263349
Oct 14, 15:16 UTC 56 189.51.105.0/24 AS263349
Oct 14, 15:16 UTC 56 189.51.108.0/24 AS263349
Oct 14, 15:16 UTC 56 186.250.237.0/24 AS262821
Oct 14, 15:16 UTC 56 168.232.84.0/24 AS264562
Oct 14, 15:16 UTC 56 189.51.104.0/24 AS263349
Oct 14, 15:16 UTC 56 45.174.188.0/24 AS264562
Oct 14, 15:16 UTC 56 189.28.171.0/24 AS28300
Oct 14, 15:16 UTC 56 200.152.30.0/24 AS28590
Oct 14, 15:16 UTC 56 187.111.132.0/24 AS53121
Oct 14, 15:16 UTC 56 177.38.196.0/23 AS262409
Oct 14, 15:16 UTC 56 177.47.80.0/24 AS262480
Oct 14, 15:16 UTC 56 170.246.18.0/24 AS264295
Oct 14, 15:16 UTC 56 189.51.126.0/24 AS263349
Oct 14, 15:16 UTC 56 103.134.161.0/24 AS136284
Oct 14, 15:16 UTC 56 191.37.154.0/23 AS263362
Oct 14, 15:16 UTC 56 138.99.201.0/24 AS264210
Oct 14, 15:16 UTC 56 45.6.25.0/24 AS266118
Oct 14, 15:16 UTC 56 138.94.66.0/24 AS264135
Oct 14, 15:16 UTC 56 168.227.101.0/24 AS52603
Oct 14, 15:16 UTC 56 177.38.192.0/23 AS262409
Oct 14, 15:16 UTC 56 204.157.166.0/24 AS272744
Oct 14, 15:16 UTC 56 187.49.176.0/24 AS264562
Oct 14, 15:16 UTC 56 177.92.96.0/22 AS17222
Oct 14, 15:16 UTC 56 45.185.120.0/23 AS269096
Oct 14, 15:16 UTC 56 177.39.212.0/23 AS262433
Oct 14, 15:16 UTC 56 200.152.28.0/24 AS28590
Oct 14, 15:16 UTC 56 131.0.255.0/24 AS263555
Oct 14, 15:16 UTC 56 186.251.100.0/24 AS262828
Oct 14, 15:16 UTC 56 177.223.187.0/24 AS28300
Oct 14, 15:16 UTC 56 189.51.110.0/24 AS263349
Oct 14, 15:16 UTC 56 45.189.240.0/23 AS269604
Oct 14, 15:16 UTC 56 203.77.174.0/24 AS153526
Oct 14, 15:16 UTC 56 177.74.236.0/23 AS263652
Oct 14, 15:16 UTC 56 179.189.20.0/24 AS52630
Oct 14, 15:16 UTC 56 192.140.14.0/23 AS266160
Oct 14, 15:16 UTC 56 186.232.94.0/23 AS269096
Oct 14, 15:16 UTC 56 203.77.175.0/24 AS153526
Oct 14, 15:16 UTC 56 177.129.241.0/24 AS270888
Oct 14, 15:16 UTC 56 186.251.182.0/23 AS262832
Oct 14, 15:16 UTC 56 45.165.211.0/24 AS268692
Oct 14, 15:16 UTC 56 177.39.210.0/23 AS262433
Oct 14, 15:16 UTC 56 45.185.4.0/23 AS269355
Oct 14, 15:16 UTC 56 201.71.247.0/24 AS268976
Oct 14, 15:16 UTC 56 186.251.98.0/23 AS262828
Oct 14, 15:16 UTC 56 186.250.178.0/24 AS53216
Oct 14, 15:16 UTC 56 177.86.108.0/24 AS262903
Oct 14, 15:16 UTC 56 177.124.76.0/23 AS52601
Oct 14, 15:16 UTC 56 200.50.151.0/24 AS271652
Oct 14, 15:16 UTC 56 138.97.70.0/23 AS264147
Oct 14, 15:16 UTC 56 45.179.229.0/24 AS269118
Oct 14, 15:16 UTC 56 189.51.100.0/24 AS263349
Oct 14, 15:16 UTC 56 170.79.105.0/24 AS268976
Oct 14, 15:16 UTC 56 45.237.246.0/24 AS268296
Oct 14, 15:16 UTC 56 45.165.132.0/24 AS268676
Oct 14, 15:16 UTC 56 192.140.12.0/23 AS266160
Oct 14, 15:16 UTC 56 177.70.250.0/24 AS262995
Oct 14, 15:16 UTC 56 177.223.165.0/24 AS28300
Oct 14, 15:16 UTC 56 45.231.162.0/24 AS267227
Oct 14, 15:16 UTC 56 191.7.204.0/22 AS263327
Oct 14, 15:16 UTC 56 179.48.114.0/24 AS271086
Oct 14, 15:16 UTC 56 177.10.208.0/23 AS262856
Oct 14, 15:16 UTC 56 45.189.242.0/23 AS269604
Oct 14, 15:16 UTC 56 186.251.97.0/24 AS262828
Oct 14, 15:16 UTC 56 45.175.250.0/23 AS269096
Oct 14, 15:16 UTC 56 161.38.40.0/24 AS17222
Oct 14, 15:16 UTC 56 187.111.129.0/24 AS53121
Oct 14, 15:16 UTC 56 189.51.121.0/24 AS263349
Oct 14, 15:16 UTC 56 170.81.180.0/23 AS53121
Oct 14, 15:16 UTC 56 223.30.210.0/24 AS9583
Oct 14, 15:16 UTC 56 186.251.98.0/24 AS262828
Oct 14, 15:16 UTC 56 170.254.46.0/23 AS265153
Oct 14, 15:16 UTC 56 45.174.189.0/24 AS264562
Oct 14, 15:16 UTC 56 179.109.62.0/24 AS262903
Oct 14, 15:16 UTC 56 177.223.185.0/24 AS28300
Oct 14, 15:16 UTC 56 177.74.232.0/23 AS263652
Oct 14, 15:16 UTC 56 187.111.137.0/24 AS53121
Oct 14, 15:16 UTC 56 164.163.18.0/24 AS265952
Oct 14, 15:16 UTC 56 191.37.152.0/23 AS263362
Oct 14, 15:16 UTC 56 189.51.114.0/24 AS263349
Oct 14, 15:16 UTC 56 189.51.112.0/24 AS263349
Oct 14, 15:16 UTC 56 186.232.90.0/23 AS269096
Oct 14, 15:16 UTC 56 45.185.122.0/23 AS269096
Oct 14, 15:16 UTC 56 177.124.0.0/23 AS262311
Oct 14, 15:16 UTC 56 177.86.105.0/24 AS262903
Oct 14, 15:16 UTC 56 200.106.192.0/23 AS265475
Oct 14, 15:16 UTC 56 200.188.216.0/24 AS28590
Oct 14, 15:16 UTC 56 177.91.164.0/24 AS263445
Oct 14, 15:16 UTC 56 45.165.133.0/24 AS268676
Oct 14, 15:16 UTC 56 187.111.136.0/24 AS53121
Oct 14, 15:16 UTC 56 177.70.251.0/24 AS262995
Oct 14, 15:16 UTC 56 138.121.117.0/24 AS264295
Oct 14, 15:16 UTC 56 179.63.134.0/24 AS271560
Oct 14, 15:16 UTC 56 170.246.17.0/24 AS264295
Oct 14, 15:16 UTC 56 45.165.208.0/24 AS268692
Oct 14, 15:16 UTC 56 168.181.155.0/24 AS264295
Oct 14, 15:16 UTC 56 191.37.23.0/24 AS263349
Oct 14, 15:16 UTC 56 201.182.48.0/23 AS267521
Oct 14, 15:16 UTC 56 187.120.179.0/24 AS264013
Oct 14, 15:16 UTC 56 170.81.182.0/23 AS53121
Oct 14, 15:16 UTC 56 103.85.210.0/24 AS135760

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 2026-10-14 15:40 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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