Possible BGP hijack

Beginning at 2022-08-11 16:56:32 UTC, we detected a possible BGP hijack.

Prefix 21.0.0.0/8, is normally announced by AS749 DNIC-AS-00749, US.

But beginning at 2022-08-11 16:56:32, the same prefix (21.0.0.0/8) was also announced by ASN 18403.

This was detected by 34 BGPMon peers.

Expected
Start time: 2022-08-11 16:56:32 UTC
Expected prefix: 21.0.0.0/8
Expected ASN: 749 (DNIC-AS-00749, US)
Event Details
Detected advertisement: 21.0.0.0/8
Detected Origin ASN 18403 (FPT-AS-AP The Corporation for Financing & Promoting Technology, VN)
Detected AS Path 51514 8455 18403 18403
Detected by number of BGPMon peers: 34

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