Possible BGP hijack

Beginning at 2021-10-01 16:43:50 UTC, we detected a possible BGP hijack.

Prefix 128.221.238.0/24, is normally announced by AS12257 EMC-AS12257, US.

But beginning at 2021-10-01 16:43:50, the same prefix (128.221.238.0/24) was also announced by ASN 2147483647.

This was detected by 26 BGPMon peers.

Expected
Start time: 2021-10-01 16:43:50 UTC
Expected prefix: 128.221.238.0/24
Expected ASN: 12257 (EMC-AS12257, US)
Event Details
Detected advertisement: 128.221.238.0/24
Detected Origin ASN 2147483647 ()
Detected AS Path 28186 37468 1828 3614 4281466974
Detected by number of BGPMon peers: 26

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