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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 4,870 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Oct 14, 10:16 UTC 56 37.57.33.0/24 AS13188
Oct 14, 10:16 UTC 56 94.140.192.0/19 AS35000
Oct 14, 10:16 UTC 56 91.192.48.0/22 AS208245
Oct 14, 10:16 UTC 56 24.48.166.0/24 AS11492
Oct 14, 10:16 UTC 60 2.75.116.0/23 AS29355
Oct 14, 10:16 UTC 60 2.75.252.0/24 AS29355
Oct 14, 10:16 UTC 56 88.158.129.0/24 AS15471
Oct 14, 10:16 UTC 56 38.156.100.0/23 AS263793
Oct 14, 10:16 UTC 56 80.75.144.0/21 AS44902
Oct 14, 10:16 UTC 56 46.8.163.0/24 AS201746
Oct 14, 10:16 UTC 56 38.84.24.0/24 AS209553
Oct 14, 10:16 UTC 56 152.236.130.0/23 AS49915
Oct 14, 10:16 UTC 56 69.41.38.0/24 AS19197
Oct 14, 10:16 UTC 56 5.149.132.0/23 AS35753
Oct 14, 10:16 UTC 56 102.34.7.0/24 AS327687
Oct 14, 10:16 UTC 56 44.32.63.0/24 AS215734
Oct 14, 10:16 UTC 56 5.32.184.0/21 AS198904
Oct 14, 10:16 UTC 56 69.128.144.0/24 AS20127
Oct 14, 10:16 UTC 56 45.91.195.0/24 AS211161
Oct 14, 10:16 UTC 56 103.234.232.0/22 AS12886
Oct 14, 10:16 UTC 56 93.95.5.0/24 AS44858
Oct 14, 10:16 UTC 60 2.75.119.0/24 AS29355
Oct 14, 10:16 UTC 56 38.226.24.0/22 AS272894
Oct 14, 10:16 UTC 56 91.227.55.0/24 AS48384
Oct 14, 10:16 UTC 56 46.219.198.0/24 AS31148
Oct 14, 10:16 UTC 56 93.184.141.0/24 AS43066
Oct 14, 10:16 UTC 60 2.75.46.0/23 AS29355
Oct 14, 10:16 UTC 60 2.75.180.0/24 AS29355
Oct 14, 10:16 UTC 60 2.75.50.0/23 AS29355
Oct 14, 10:16 UTC 56 38.148.192.0/22 AS8796
Oct 14, 10:16 UTC 60 2.75.155.0/24 AS29355
Oct 14, 10:16 UTC 58 37.239.172.0/22 AS203214
Oct 14, 10:16 UTC 56 185.137.0.0/23 AS203372
Oct 14, 10:16 UTC 56 66.9.162.0/23 AS14593
Oct 14, 10:16 UTC 60 2.75.161.0/24 AS29355
Oct 14, 10:16 UTC 56 37.148.220.0/22 AS207645
Oct 14, 10:16 UTC 56 24.116.223.0/24 AS11492
Oct 14, 10:16 UTC 56 23.208.208.0/22 AS6057
Oct 14, 10:16 UTC 56 74.209.153.0/24 AS39948
Oct 14, 10:16 UTC 56 66.234.88.0/23 AS397048
Oct 14, 10:16 UTC 56 77.123.140.0/22 AS35680
Oct 14, 10:16 UTC 56 46.182.176.0/21 AS21221
Oct 14, 10:16 UTC 60 2.75.122.0/23 AS29355
Oct 14, 10:16 UTC 56 94.188.245.0/24 AS212527
Oct 14, 10:16 UTC 56 88.158.28.0/23 AS15471
Oct 14, 10:16 UTC 56 185.214.104.0/22 AS48351
Oct 14, 10:16 UTC 56 5.255.119.0/24 AS60404
Oct 14, 10:16 UTC 56 91.212.136.0/24 AS199217
Oct 14, 10:16 UTC 56 216.224.249.0/24 AS39948
Oct 14, 10:16 UTC 56 91.223.2.0/24 AS213335
Oct 14, 10:16 UTC 58 2.75.240.0/21 AS29355
Oct 14, 10:16 UTC 56 5.2.66.0/24 AS60404
Oct 14, 10:16 UTC 56 80.94.0.0/20 AS39263
Oct 14, 10:16 UTC 56 5.2.79.0/24 AS60404
Oct 14, 10:16 UTC 56 85.132.136.0/22 AS205400
Oct 14, 10:16 UTC 56 89.38.48.0/24 AS34740
Oct 14, 10:16 UTC 56 86.38.113.0/24 AS198651
Oct 14, 10:16 UTC 56 66.22.111.0/24 AS48851
Oct 14, 10:16 UTC 56 41.79.20.0/22 AS37314
Oct 14, 10:16 UTC 56 93.157.80.0/21 AS41714
Oct 14, 10:16 UTC 56 71.18.210.0/24 AS396986
Oct 14, 10:16 UTC 56 104.253.69.0/24 AS62160
Oct 14, 10:16 UTC 56 77.90.143.0/24 AS42821
Oct 14, 10:16 UTC 56 138.84.54.0/23 AS14593
Oct 14, 10:16 UTC 56 159.224.93.0/24 AS13188
Oct 14, 10:16 UTC 60 2.75.78.0/23 AS29355
Oct 14, 10:16 UTC 58 2.75.192.0/21 AS29355
Oct 14, 10:16 UTC 56 109.251.109.0/24 AS31148
Oct 14, 10:16 UTC 56 5.255.106.0/24 AS60404
Oct 14, 10:16 UTC 56 164.73.0.0/16 AS1797
Oct 14, 10:16 UTC 58 37.238.118.0/23 AS203214
Oct 14, 10:16 UTC 56 74.209.156.0/24 AS39948
Oct 14, 10:16 UTC 56 147.90.122.0/24 AS203636
Oct 14, 10:16 UTC 56 46.219.124.0/24 AS31148
Oct 14, 10:16 UTC 56 89.36.89.0/24 AS43938
Oct 14, 10:16 UTC 60 2.75.124.0/23 AS29355
Oct 14, 10:16 UTC 56 46.219.52.0/24 AS31148
Oct 14, 10:16 UTC 56 38.95.180.0/24 AS274201
Oct 14, 10:16 UTC 56 46.219.54.0/24 AS31148
Oct 14, 10:16 UTC 60 2.75.14.0/24 AS29355
Oct 14, 10:16 UTC 56 37.25.0.0/19 AS25019
Oct 14, 10:16 UTC 56 141.226.55.0/24 AS210625
Oct 14, 10:16 UTC 56 45.4.54.0/24 AS266040
Oct 14, 10:16 UTC 60 2.75.218.0/24 AS29355
Oct 14, 10:16 UTC 56 46.8.165.0/24 AS201746
Oct 14, 10:16 UTC 56 88.158.21.0/24 AS15471
Oct 14, 10:16 UTC 56 37.72.130.0/24 AS200628
Oct 14, 10:16 UTC 56 206.84.62.0/23 AS265175
Oct 14, 10:16 UTC 60 2.75.254.0/24 AS29355
Oct 14, 10:16 UTC 56 5.255.100.0/24 AS60404
Oct 14, 10:16 UTC 56 5.58.64.0/19 AS16223
Oct 14, 10:16 UTC 60 2.75.87.0/24 AS29355
Oct 14, 10:16 UTC 56 31.41.16.0/22 AS44851
Oct 14, 10:16 UTC 56 206.84.36.0/22 AS265175
Oct 14, 10:16 UTC 56 91.234.168.0/23 AS50819
Oct 14, 10:16 UTC 56 128.14.138.0/24 AS21859
Oct 14, 10:16 UTC 56 78.140.192.0/20 AS35000
Oct 14, 10:16 UTC 56 109.251.219.0/24 AS31148
Oct 14, 10:16 UTC 60 2.75.186.0/24 AS29355
Oct 14, 10:16 UTC 60 2.75.153.0/24 AS29355
Oct 14, 10:16 UTC 56 66.234.80.0/20 AS397048
Oct 14, 10:16 UTC 56 129.208.0.0/16 AS25019
Oct 14, 10:16 UTC 56 47.87.6.0/24 AS45102
Oct 14, 10:16 UTC 56 45.67.205.0/24 AS207364
Oct 14, 10:16 UTC 56 95.170.224.0/22 AS16006
Oct 14, 10:16 UTC 56 37.57.130.0/24 AS13188
Oct 14, 10:16 UTC 56 216.224.236.0/24 AS39948
Oct 14, 10:16 UTC 58 37.236.9.0/24 AS203214
Oct 14, 10:16 UTC 56 44.31.176.0/24 AS202224
Oct 14, 10:16 UTC 56 216.224.225.0/24 AS39948
Oct 14, 10:16 UTC 56 85.8.131.0/24 AS39563
Oct 14, 10:16 UTC 56 46.219.120.0/24 AS31148
Oct 14, 10:16 UTC 56 74.2.48.0/22 AS137830
Oct 14, 10:16 UTC 56 74.209.152.0/24 AS39948
Oct 14, 10:16 UTC 56 80.64.80.0/24 AS24812
Oct 14, 10:16 UTC 56 198.99.230.0/24 AS200343
Oct 14, 10:16 UTC 56 109.197.34.0/24 AS25070
Oct 14, 10:16 UTC 56 80.245.192.0/20 AS21360
Oct 14, 10:16 UTC 56 45.223.204.0/24 AS19551
Oct 14, 10:16 UTC 56 83.98.136.0/23 AS30870
Oct 14, 10:16 UTC 56 89.36.193.0/24 AS43938
Oct 14, 10:16 UTC 56 64.40.169.0/24 AS15035
Oct 14, 10:16 UTC 58 2.75.56.0/21 AS29355
Oct 14, 10:16 UTC 56 128.0.53.0/24 AS60993
Oct 14, 10:16 UTC 56 93.157.56.0/24 AS57580
Oct 14, 10:16 UTC 56 37.18.128.0/22 AS49354
Oct 14, 10:16 UTC 56 109.201.226.0/24 AS25229
Oct 14, 10:16 UTC 56 91.198.160.0/24 AS43807
Oct 14, 10:16 UTC 56 88.158.42.0/23 AS15471
Oct 14, 10:16 UTC 56 5.255.96.0/24 AS60404
Oct 14, 10:16 UTC 56 77.90.136.0/24 AS42821
Oct 14, 10:16 UTC 56 95.47.253.0/24 AS49168
Oct 14, 10:16 UTC 56 88.158.44.0/23 AS15471
Oct 14, 10:16 UTC 56 45.4.55.0/24 AS266040
Oct 14, 10:16 UTC 56 145.250.219.0/24 AS213196
Oct 14, 10:16 UTC 56 77.90.130.0/24 AS42821
Oct 14, 10:16 UTC 56 88.158.54.0/24 AS15471
Oct 14, 10:16 UTC 56 9.170.66.0/23 AS14593
Oct 14, 10:16 UTC 56 85.120.64.0/24 AS34416
Oct 14, 10:16 UTC 60 2.75.15.0/24 AS29355
Oct 14, 10:16 UTC 60 2.75.20.0/23 AS29355
Oct 14, 10:16 UTC 56 109.251.26.0/24 AS31148
Oct 14, 10:16 UTC 56 199.87.184.0/23 AS32524
Oct 14, 10:16 UTC 56 46.8.169.0/24 AS201746
Oct 14, 10:16 UTC 56 31.12.0.0/21 AS29287
Oct 14, 10:16 UTC 56 3.173.18.0/24 AS16509
Oct 14, 10:16 UTC 58 37.239.94.0/23 AS203214
Oct 14, 10:16 UTC 56 77.245.32.0/20 AS42777
Oct 14, 10:16 UTC 60 2.75.86.0/24 AS29355
Oct 14, 10:16 UTC 56 77.120.108.0/22 AS35680
Oct 14, 10:16 UTC 56 5.104.171.0/24 AS49699
Oct 14, 10:16 UTC 60 2.75.90.0/24 AS29355
Oct 14, 10:16 UTC 56 47.87.7.0/24 AS45102
Oct 14, 10:16 UTC 56 45.160.73.0/24 AS266878
Oct 14, 10:16 UTC 58 37.238.115.0/24 AS203214
Oct 14, 10:16 UTC 56 206.84.32.0/21 AS265175
Oct 14, 10:16 UTC 56 93.190.144.0/21 AS25409
Oct 14, 10:16 UTC 56 46.219.199.0/24 AS31148
Oct 14, 10:16 UTC 60 2.75.143.0/24 AS29355
Oct 14, 10:16 UTC 58 102.218.153.0/24 AS328925
Oct 14, 10:16 UTC 56 89.200.243.0/24 AS60090
Oct 14, 10:16 UTC 56 194.154.27.0/24 AS219399
Oct 14, 10:16 UTC 56 38.9.11.0/24 AS207645
Oct 14, 10:16 UTC 56 37.57.105.0/24 AS13188
Oct 14, 10:16 UTC 56 109.232.136.0/21 AS196865
Oct 14, 10:16 UTC 56 24.239.166.0/24 AS55256
Oct 14, 10:16 UTC 56 141.98.224.0/24 AS209571
Oct 14, 10:16 UTC 60 2.75.192.0/24 AS29355
Oct 14, 10:16 UTC 58 37.236.223.0/24 AS203214
Oct 14, 10:16 UTC 56 38.156.102.0/23 AS263793
Oct 14, 10:16 UTC 56 46.219.95.0/24 AS31148
Oct 14, 10:16 UTC 56 37.57.27.0/24 AS13188
Oct 14, 10:16 UTC 60 2.75.208.0/24 AS29355
Oct 14, 10:16 UTC 56 109.251.55.0/24 AS31148
Oct 14, 10:16 UTC 56 88.158.88.0/23 AS15471
Oct 14, 10:16 UTC 56 91.214.56.0/22 AS47586
Oct 14, 10:16 UTC 56 94.97.3.0/24 AS25019
Oct 14, 10:16 UTC 56 77.238.180.0/24 AS203070
Oct 14, 10:16 UTC 56 102.205.192.0/24 AS329550
Oct 14, 10:16 UTC 56 5.182.180.0/24 AS16370
Oct 14, 10:16 UTC 56 91.204.64.0/22 AS47371
Oct 14, 10:16 UTC 56 5.22.167.0/24 AS21215
Oct 14, 10:16 UTC 56 9.170.224.0/23 AS14593
Oct 14, 10:16 UTC 60 2.75.220.0/24 AS29355
Oct 14, 10:16 UTC 56 46.219.197.0/24 AS31148
Oct 14, 10:16 UTC 56 179.43.90.0/24 AS263185
Oct 14, 10:16 UTC 56 37.120.157.0/24 AS9009
Oct 14, 10:16 UTC 56 91.221.144.0/23 AS197459
Oct 14, 10:16 UTC 60 2.75.84.0/24 AS29355
Oct 14, 10:16 UTC 56 143.105.30.0/23 AS14593
Oct 14, 10:16 UTC 60 2.75.92.0/24 AS29355
Oct 14, 10:16 UTC 56 46.219.127.0/24 AS31148
Oct 14, 10:16 UTC 56 91.211.252.0/22 AS31129
Oct 14, 10:16 UTC 56 45.82.8.0/22 AS35352
Oct 14, 10:16 UTC 56 74.209.155.0/24 AS39948
Oct 14, 10:16 UTC 58 2.75.88.0/21 AS29355
Oct 14, 10:16 UTC 60 2.75.17.0/24 AS29355
Oct 14, 10:16 UTC 56 135.129.8.0/24 AS14593
Oct 14, 10:16 UTC 56 178.151.64.0/24 AS13188
Oct 14, 10:16 UTC 60 2.75.120.0/23 AS29355

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 10:40 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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