Skip to main content
WorldIP.io

Pulse — AS-path anomaly

Unique-AS-path lengths (prepends collapsed) that deviate sharply from the recent 36-hour median for that prefix.

⇲ Atom All feeds ←
Events last 24h
954
Most recent
Showing
200
Refresh
● every 60s

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 954 · last 24h
Most recent AS-path anomaly events detected across RIPE RIS collectors in the last 24 hours
When Severity Prefix AS
Aug 29, 20:56 UTC 56 84.245.88.0/23 AS206198
Aug 29, 20:56 UTC 56 66.6.59.0/24 AS213382
Aug 29, 20:56 UTC 56 185.224.200.0/22 AS205243
Aug 29, 20:56 UTC 56 185.92.203.0/24 AS200849
Aug 29, 20:56 UTC 56 159.253.232.0/21 AS50698
Aug 29, 20:56 UTC 56 194.180.249.0/24 AS62028
Aug 29, 20:56 UTC 56 45.146.129.0/24 AS49981
Aug 29, 20:56 UTC 56 185.6.144.0/24 AS44645
Aug 29, 20:56 UTC 56 151.252.45.0/24 AS25291
Aug 29, 20:56 UTC 56 91.210.131.0/24 AS44279
Aug 29, 20:56 UTC 56 45.130.209.0/24 AS34903
Aug 29, 20:56 UTC 56 194.48.184.0/22 AS8245
Aug 29, 20:56 UTC 56 157.25.57.0/24 AS206770
Aug 29, 20:56 UTC 56 185.56.107.0/24 AS43902
Aug 29, 20:56 UTC 56 82.177.202.0/23 AS206442
Aug 29, 20:56 UTC 56 185.53.180.0/22 AS34767
Aug 29, 20:56 UTC 56 185.4.112.0/22 AS49981
Aug 29, 20:56 UTC 56 185.184.192.0/22 AS49981
Aug 29, 20:56 UTC 56 179.125.20.0/24 AS265066
Aug 29, 20:56 UTC 56 46.220.0.0/16 AS25255
Aug 29, 20:56 UTC 56 91.123.100.0/24 AS8302
Aug 29, 20:56 UTC 56 46.28.234.0/24 AS207728
Aug 29, 20:56 UTC 56 170.79.98.0/24 AS265066
Aug 29, 20:56 UTC 56 168.121.202.0/24 AS265066
Aug 29, 20:56 UTC 56 91.220.237.0/24 AS212537
Aug 29, 20:56 UTC 56 149.57.229.0/24 AS49981
Aug 29, 20:56 UTC 56 185.99.80.0/22 AS15702
Aug 29, 20:56 UTC 56 138.226.220.0/24 AS207728
Aug 29, 20:56 UTC 56 195.136.158.0/23 AS199260
Aug 29, 20:56 UTC 56 194.35.236.0/23 AS49007
Aug 29, 20:56 UTC 56 45.82.64.0/22 AS49981
Aug 29, 20:56 UTC 56 109.68.225.0/24 AS25291
Aug 29, 20:56 UTC 56 193.46.101.0/24 AS28889
Aug 29, 20:56 UTC 56 195.136.12.0/23 AS199260
Aug 29, 20:56 UTC 56 193.105.20.0/24 AS50423
Aug 29, 20:56 UTC 56 109.94.248.0/24 AS50086
Aug 29, 20:56 UTC 56 185.21.60.0/22 AS49981
Aug 29, 20:56 UTC 56 185.215.200.0/22 AS205243
Aug 29, 20:56 UTC 56 185.204.52.0/24 AS207728
Aug 29, 20:56 UTC 56 185.100.232.0/22 AS49981
Aug 29, 20:56 UTC 56 212.236.32.0/20 AS8245
Aug 29, 20:56 UTC 56 91.217.228.0/24 AS24732
Aug 29, 20:56 UTC 56 217.79.146.0/23 AS42923
Aug 29, 20:56 UTC 56 193.43.12.0/23 AS204295
Aug 29, 20:56 UTC 56 45.3.56.0/24 AS25255
Aug 29, 20:56 UTC 56 82.177.204.0/24 AS50625
Aug 29, 20:56 UTC 56 45.130.210.0/24 AS34903
Aug 29, 20:56 UTC 56 195.69.209.0/24 AS25070
Aug 29, 20:56 UTC 56 151.96.0.0/16 AS8217
Aug 29, 20:56 UTC 56 81.15.145.0/24 AS205034
Aug 29, 20:56 UTC 56 195.167.149.0/24 AS206838
Aug 29, 20:56 UTC 56 109.68.229.0/24 AS25291
Aug 29, 20:56 UTC 56 176.10.15.0/24 AS205975
Aug 29, 20:56 UTC 56 37.0.113.0/24 AS10780
Aug 29, 20:56 UTC 56 185.150.34.0/24 AS44645
Aug 29, 20:56 UTC 56 185.123.108.0/22 AS203813
Aug 29, 20:56 UTC 56 185.13.144.0/22 AS49633
Aug 29, 20:56 UTC 56 185.92.202.0/24 AS200849
Aug 29, 20:56 UTC 56 185.162.11.0/24 AS207728
Aug 29, 20:56 UTC 56 81.15.155.0/24 AS211388
Aug 29, 20:56 UTC 56 212.236.48.0/21 AS8245
Aug 29, 20:56 UTC 56 185.132.132.0/22 AS49981
Aug 29, 20:56 UTC 56 109.94.250.0/24 AS50086
Aug 29, 20:56 UTC 56 91.210.130.0/24 AS44279
Aug 29, 20:56 UTC 56 195.136.76.0/24 AS202403
Aug 29, 20:56 UTC 56 185.21.63.0/24 AS49981
Aug 29, 20:56 UTC 56 88.220.138.0/24 AS210587
Aug 29, 20:56 UTC 56 45.14.132.0/22 AS49981
Aug 29, 20:56 UTC 56 109.94.241.0/24 AS50086
Aug 29, 20:56 UTC 56 185.110.136.0/23 AS210947
Aug 29, 20:56 UTC 56 91.216.202.0/24 AS197135
Aug 29, 20:56 UTC 56 195.167.148.0/24 AS206838
Aug 29, 20:56 UTC 56 168.121.200.0/24 AS265066
Aug 29, 20:56 UTC 56 185.74.0.0/22 AS8596
Aug 29, 20:56 UTC 56 185.105.192.0/22 AS49981
Aug 29, 20:56 UTC 56 185.204.55.0/24 AS207728
Aug 29, 20:56 UTC 56 46.231.152.0/21 AS34999
Aug 29, 20:56 UTC 56 185.183.32.0/22 AS49981
Aug 29, 20:56 UTC 58 185.121.40.0/22 AS35369
Aug 29, 20:56 UTC 56 195.136.123.0/24 AS213530
Aug 29, 20:56 UTC 56 2.59.168.0/22 AS49981
Aug 29, 20:56 UTC 56 88.220.82.0/23 AS201904
Aug 29, 20:56 UTC 56 200.189.48.0/21 AS14204
Aug 29, 20:56 UTC 56 185.182.194.0/24 AS49981
Aug 29, 20:56 UTC 56 185.180.220.0/22 AS49981
Aug 29, 20:56 UTC 56 5.252.152.0/24 AS49981
Aug 29, 20:56 UTC 56 195.234.164.0/24 AS204953
Aug 29, 20:56 UTC 56 82.160.29.0/24 AS61256
Aug 29, 20:56 UTC 56 212.236.248.0/22 AS8245
Aug 29, 20:56 UTC 56 185.119.160.0/22 AS199205
Aug 29, 20:56 UTC 56 88.220.71.0/24 AS199694
Aug 29, 20:56 UTC 56 45.130.208.0/24 AS34903
Aug 29, 20:56 UTC 56 31.210.172.0/24 AS207728
Aug 29, 20:56 UTC 56 104.238.26.0/24 AS205380
Aug 29, 20:56 UTC 56 92.63.32.0/20 AS49633
Aug 29, 20:56 UTC 56 195.26.198.0/24 AS8245
Aug 29, 20:56 UTC 56 45.145.52.0/24 AS49981
Aug 29, 20:56 UTC 56 185.182.192.0/24 AS49981
Aug 29, 20:56 UTC 56 69.41.54.0/24 AS19197
Aug 29, 20:56 UTC 56 185.11.217.0/24 AS49981
Aug 29, 20:56 UTC 56 82.177.128.0/24 AS206093
Aug 29, 20:56 UTC 56 185.244.138.0/24 AS49981
Aug 29, 20:56 UTC 56 179.125.23.0/24 AS265066
Aug 29, 20:56 UTC 56 185.18.132.0/22 AS199390
Aug 29, 20:56 UTC 56 109.94.245.0/24 AS50086
Aug 29, 20:56 UTC 56 81.15.237.0/24 AS203279
Aug 29, 20:56 UTC 56 69.41.56.0/24 AS19197
Aug 29, 20:56 UTC 56 46.175.56.0/21 AS25504
Aug 29, 20:56 UTC 56 31.10.5.0/24 AS207728
Aug 29, 20:56 UTC 56 212.236.0.0/19 AS8245
Aug 29, 20:56 UTC 56 212.236.212.0/22 AS8245
Aug 29, 20:56 UTC 56 185.132.176.0/22 AS49981
Aug 29, 20:56 UTC 56 85.248.235.0/24 AS34443
Aug 29, 20:56 UTC 56 91.235.16.0/22 AS204295
Aug 29, 20:56 UTC 56 185.2.80.0/22 AS49981
Aug 29, 20:56 UTC 56 179.42.149.0/24 AS265066
Aug 29, 20:56 UTC 56 195.150.192.0/22 AS203890
Aug 29, 20:56 UTC 56 176.74.59.0/24 AS25291
Aug 29, 20:56 UTC 56 185.41.94.0/23 AS199953
Aug 29, 20:56 UTC 56 109.68.228.0/24 AS25291
Aug 29, 20:56 UTC 56 192.162.44.0/22 AS197682
Aug 29, 20:56 UTC 56 213.199.213.0/24 AS25070
Aug 29, 20:56 UTC 56 185.92.200.0/24 AS200849
Aug 29, 20:56 UTC 56 185.90.232.0/22 AS25504
Aug 29, 20:56 UTC 56 163.5.214.0/24 AS49981
Aug 29, 20:56 UTC 56 145.237.221.0/24 AS34339
Aug 29, 20:56 UTC 56 45.130.201.0/24 AS49981
Aug 29, 20:56 UTC 56 81.15.191.0/24 AS204301
Aug 29, 20:56 UTC 56 77.247.81.0/24 AS25291
Aug 29, 20:56 UTC 56 147.90.59.0/24 AS49981
Aug 29, 20:56 UTC 56 185.172.108.0/24 AS49981
Aug 29, 20:56 UTC 56 193.46.102.0/23 AS28889
Aug 29, 20:56 UTC 56 185.150.32.0/24 AS44645
Aug 29, 20:56 UTC 56 195.136.108.0/24 AS215903
Aug 29, 20:56 UTC 56 37.202.210.0/24 AS49981
Aug 29, 20:56 UTC 56 82.177.195.0/24 AS197142
Aug 29, 20:56 UTC 56 80.241.128.0/21 AS16296
Aug 29, 20:56 UTC 56 185.99.99.0/24 AS49981
Aug 29, 20:56 UTC 58 185.168.100.0/22 AS35369
Aug 29, 20:56 UTC 56 185.182.192.0/22 AS49981
Aug 29, 20:56 UTC 56 185.165.240.0/22 AS49981
Aug 29, 20:56 UTC 56 185.162.8.0/24 AS207728
Aug 29, 20:56 UTC 56 192.108.125.0/24 AS34521
Aug 29, 20:56 UTC 56 185.193.65.0/24 AS49981
Aug 29, 20:56 UTC 56 185.92.201.0/24 AS200849
Aug 29, 20:56 UTC 56 45.130.208.0/22 AS34903
Aug 29, 20:56 UTC 56 104.192.42.0/24 AS207728
Aug 29, 20:56 UTC 56 149.57.36.0/24 AS49981
Aug 29, 20:56 UTC 56 179.42.148.0/24 AS265066
Aug 29, 20:56 UTC 56 81.15.246.0/24 AS25070
Aug 29, 20:56 UTC 56 80.252.32.0/20 AS15702
Aug 29, 20:56 UTC 56 195.182.9.0/24 AS39171
Aug 29, 20:56 UTC 56 45.150.156.0/22 AS49981
Aug 29, 20:56 UTC 56 185.116.76.0/22 AS50698
Aug 29, 20:56 UTC 56 80.75.240.0/20 AS34767
Aug 29, 20:56 UTC 56 176.119.217.0/24 AS215385
Aug 29, 20:56 UTC 56 195.242.184.0/24 AS8245
Aug 29, 20:56 UTC 56 91.231.92.0/24 AS47672
Aug 29, 20:56 UTC 56 46.148.132.0/22 AS44056
Aug 29, 20:56 UTC 56 149.57.4.0/24 AS49981
Aug 29, 20:56 UTC 56 5.254.184.0/21 AS199205
Aug 29, 20:56 UTC 56 185.177.124.0/22 AS49981
Aug 29, 20:56 UTC 56 31.58.208.0/24 AS49981
Aug 29, 20:56 UTC 56 88.199.162.0/24 AS42923
Aug 29, 20:56 UTC 58 195.66.92.0/24 AS39460
Aug 29, 20:56 UTC 56 217.79.144.0/23 AS42923
Aug 29, 20:56 UTC 56 194.58.196.0/24 AS8674
Aug 29, 20:56 UTC 56 45.93.23.0/24 AS49981
Aug 29, 20:56 UTC 56 88.220.55.0/24 AS213530
Aug 29, 20:56 UTC 56 195.136.79.0/24 AS39437
Aug 29, 20:56 UTC 56 5.172.190.0/23 AS207012
Aug 29, 20:56 UTC 56 88.220.72.0/24 AS199823
Aug 29, 20:56 UTC 56 179.42.151.0/24 AS265066
Aug 29, 20:56 UTC 56 212.89.160.0/19 AS49864
Aug 29, 20:56 UTC 56 185.255.252.0/22 AS199390
Aug 29, 20:56 UTC 56 192.76.243.0/24 AS35052
Aug 29, 20:56 UTC 58 185.197.181.0/24 AS35369
Aug 29, 20:56 UTC 56 149.57.26.0/24 AS49981
Aug 29, 20:56 UTC 56 91.123.99.0/24 AS8302
Aug 29, 20:56 UTC 56 185.173.160.0/22 AS49981
Aug 29, 20:56 UTC 56 185.110.138.0/23 AS210947
Aug 29, 20:56 UTC 56 195.136.78.0/24 AS199260
Aug 29, 20:56 UTC 56 91.239.205.0/24 AS198835
Aug 29, 20:56 UTC 56 195.26.192.0/19 AS8245
Aug 29, 20:56 UTC 56 158.58.144.0/21 AS25504
Aug 29, 20:56 UTC 56 195.238.168.0/22 AS56709
Aug 29, 20:56 UTC 56 146.19.188.0/24 AS49981
Aug 29, 20:56 UTC 56 145.237.222.0/24 AS34339
Aug 29, 20:56 UTC 56 185.41.92.0/24 AS199953
Aug 29, 20:56 UTC 56 91.231.178.0/24 AS52142
Aug 29, 20:56 UTC 56 109.68.224.0/24 AS25291
Aug 29, 20:56 UTC 56 185.150.33.0/24 AS44645
Aug 29, 20:56 UTC 56 149.57.152.0/24 AS49981
Aug 29, 20:56 UTC 56 109.202.64.0/19 AS50698
Aug 29, 20:56 UTC 56 46.151.160.0/21 AS25504
Aug 29, 20:56 UTC 56 31.210.173.0/24 AS207728
Aug 29, 20:56 UTC 58 185.242.177.0/24 AS35369
Aug 29, 20:56 UTC 56 185.185.48.0/22 AS49981
Aug 29, 20:56 UTC 56 85.190.245.0/24 AS41455
Aug 29, 20:56 UTC 56 45.146.7.0/24 AS49981

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 2026-08-29 21:55 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.

Share