Possible BGP hijack

Beginning at 2023-05-12 20:01:51 UTC, we detected a possible BGP hijack.

Prefix, is normally announced by AS37917 UTINS University of Tsukuba, JP.

But beginning at 2023-05-12 20:01:51, the same prefix ( was also announced by ASN 271609.

This was detected by 2 BGPMon peers.

Start time: 2023-05-12 20:01:51 UTC
Expected prefix:
Expected ASN: 37917 (UTINS University of Tsukuba, JP)
Event Details
Detected advertisement:
Detected Origin ASN 271609 ()
Detected AS Path 28300 271609 271609
Detected by number of BGPMon peers: 2

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