Possible BGP hijack

Beginning at 2018-06-11 10:04:51 UTC, we detected a possible BGP hijack.

Prefix 5.83.240.0/20, is normally announced by AS174 Cogent Communications.

But beginning at 2018-06-11 10:04:51, the same prefix (5.83.240.0/20) was also announced by ASN 57791.

This was detected by 80 BGPMon peers.

Expected
Start time: 2018-06-11 10:04:51 UTC
Expected prefix: 5.83.240.0/20
Expected ASN: 174 (Cogent Communications)
Event Details
Detected advertisement: 5.83.240.0/20
Detected Origin ASN 57791 (Arden Broadband Ltd)
Detected AS Path 32764 11017 6939 43192 57791
Detected by number of BGPMon peers: 80

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