Possible BGP hijack

Beginning at 2019-03-09 00:17:59 UTC, we detected a possible BGP hijack.

Prefix 37.77.56.0/21, is normally announced by AS203993 STEFFANN-DC-AS, NL.

But beginning at 2019-03-09 00:17:59, the same prefix (37.77.56.0/21) was also announced by ASN 174.

This was detected by 5 BGPMon peers.

Expected
Start time: 2019-03-09 00:17:59 UTC
Expected prefix: 37.77.56.0/21
Expected ASN: 203993 (STEFFANN-DC-AS, NL)
Event Details
Detected advertisement: 37.77.56.0/21
Detected Origin ASN 174 (COGENT-174 - Cogent Communications, US)
Detected AS Path 263945 52320 174
Detected by number of BGPMon peers: 5

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