Possible BGP hijack

Beginning at 2020-09-15 17:47:33, we detected a possible BGP hijack.

Prefix 51.51.0.0/16, Normally announced by AS8075 MICROSOFT-CORP-MSN-AS-BLOCK, US

Starting at 2020-09-15 17:47:33, a more specific route (51.51.51.0/24) was announced by ASN 11139.

This was detected by 94 BGPMon peers.

Expected
Start time: 2020-09-15 17:47:33 UTC
Expected prefix: 51.51.0.0/16
Expected ASN: 8075 (MICROSOFT-CORP-MSN-AS-BLOCK, US)
Event Details
Detected advertisement: 51.51.51.0/24
Detected Origin ASN 11139 (CWC-ROC-11139, DM)
Detected AS Path 28646 8167 7738 23520 11139
Detected by number of BGPMon peers: 94

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