Possible BGP hijack

Beginning at 2023-12-25 23:23:58, we detected a possible BGP hijack.

Prefix 21.0.0.0/8, Normally announced by AS749 DNIC-AS-00749, US

Starting at 2023-12-25 23:23:58, a more specific route (21.21.21.0/24) was announced by ASN 269086.

This was detected by 14 BGPMon peers.

Expected
Start time: 2023-12-25 23:23:58 UTC
Expected prefix: 21.0.0.0/8
Expected ASN: 749 (DNIC-AS-00749, US)
Event Details
Detected advertisement: 21.21.21.0/24
Detected Origin ASN 269086 (Assembleia Legislativa do Estado do RS, BR)
Detected AS Path 48200 6762 4230 269086
Detected by number of BGPMon peers: 14

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