Possible BGP hijack

Beginning at 2023-11-28 14:36:58, we detected a possible BGP hijack.

Prefix 204.157.0.0/16, Normally announced by AS174 COGENT-174, US

Starting at 2023-11-28 14:36:58, a more specific route (204.157.142.0/24) was announced by ASN 52579.

This was detected by 14 BGPMon peers.

Expected
Start time: 2023-11-28 14:36:58 UTC
Expected prefix: 204.157.0.0/16
Expected ASN: 174 (COGENT-174, US)
Event Details
Detected advertisement: 204.157.142.0/24
Detected Origin ASN 52579 (Noroestecom Telecomunicacoes Ltda, BR)
Detected AS Path 394256 6939 3356 52579
Detected by number of BGPMon peers: 14

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