Possible BGP hijack

Beginning at 2023-09-25 03:55:20 UTC, we detected a possible BGP hijack.

Prefix 141.11.152.0/23, is normally announced by AS39521 TNGNET, NL.

But beginning at 2023-09-25 03:55:20, the same prefix (141.11.152.0/23) was also announced by ASN 21859.

This was detected by 14 BGPMon peers.

Expected
Start time: 2023-09-25 03:55:20 UTC
Expected prefix: 141.11.152.0/23
Expected ASN: 39521 (TNGNET, NL)
Event Details
Detected advertisement: 141.11.152.0/23
Detected Origin ASN 21859 (ZEN-ECN, US)
Detected AS Path 48200 6939 15412 21859 21859 21859 21859
Detected by number of BGPMon peers: 14

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