Possible BGP hijack

Beginning at 2023-11-07 13:27:23, we detected a possible BGP hijack.

Prefix 149.40.0.0/16, Normally announced by AS174 COGENT-174, US

Starting at 2023-11-07 13:27:23, a more specific route (149.40.16.0/20) was announced by ASN 28323.

This was detected by 15 BGPMon peers.

Expected
Start time: 2023-11-07 13:27:23 UTC
Expected prefix: 149.40.0.0/16
Expected ASN: 174 (COGENT-174, US)
Event Details
Detected advertisement: 149.40.16.0/20
Detected Origin ASN 28323 (VIPRede Telecomunicacoes Ltda, BR)
Detected AS Path 394256 6939 6762 264409 268696 268696 268696 268696 28323
Detected by number of BGPMon peers: 15

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