Possible BGP hijack

Beginning at 2019-11-27 10:26:29, we detected a possible BGP hijack.

Prefix 137.135.0.0/16, Normally announced by AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US

Starting at 2019-11-27 10:26:29, a more specific route (137.135.150.0/24) was announced by ASN 12479.

This was detected by 164 BGPMon peers.

Expected
Start time: 2019-11-27 10:26:29 UTC
Expected prefix: 137.135.0.0/16
Expected ASN: 8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US)
Event Details
Detected advertisement: 137.135.150.0/24
Detected Origin ASN 12479 (UNI2-AS, ES)
Detected AS Path 20647 2914 5511 12479
Detected by number of BGPMon peers: 164

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