Possible BGP hijack

Beginning at 2019-07-31 21:55:55, we detected a possible BGP hijack.

Prefix 204.91.208.0/20, Normally announced by AS174 COGENT-174 - Cogent Communications, US

Starting at 2019-07-31 21:55:55, a more specific route (204.91.212.0/22) was announced by ASN 135663.

This was detected by 2 BGPMon peers.

Expected
Start time: 2019-07-31 21:55:55 UTC
Expected prefix: 204.91.208.0/20
Expected ASN: 174 (COGENT-174 - Cogent Communications, US)
Event Details
Detected advertisement: 204.91.212.0/22
Detected Origin ASN 135663 ()
Detected AS Path 63956 703 9929 4134 4809 135663 135663 135663 135663
Detected by number of BGPMon peers: 2

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