Possible BGP hijack

Beginning at 2023-12-05 21:30:18 UTC, we detected a possible BGP hijack.

Prefix 213.185.90.0/23, is normally announced by AS57043 HOSTKEY-AS, NL.

But beginning at 2023-12-05 21:30:18, the same prefix (213.185.90.0/23) was also announced by ASN 39521.

This was detected by 14 BGPMon peers.

Expected
Start time: 2023-12-05 21:30:18 UTC
Expected prefix: 213.185.90.0/23
Expected ASN: 57043 (HOSTKEY-AS, NL)
Event Details
Detected advertisement: 213.185.90.0/23
Detected Origin ASN 39521 (TNGNET, NL)
Detected AS Path 394256 6939 1299 174 39521
Detected by number of BGPMon peers: 14

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