Possible BGP hijack

Beginning at 2017-12-06 13:18:26 UTC, we detected a possible BGP hijack.

Prefix 185.175.220.0/22, is normally announced by AS5610 O2 Czech Republic, a.s..

But beginning at 2017-12-06 13:18:26, the same prefix (185.175.220.0/22) was also announced by ASN 21435.

This was detected by 111 BGPMon peers.

Expected
Start time: 2017-12-06 13:18:26 UTC
Expected prefix: 185.175.220.0/22
Expected ASN: 5610 (O2 Czech Republic, a.s.)
Event Details
Detected advertisement: 185.175.220.0/22
Detected Origin ASN 21435 (BROADNET-CZ)
Detected AS Path 28646 3549 3356 1299 1273 16019 21435
Detected by number of BGPMon peers: 111

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