Possible BGP hijack

Beginning at 2020-12-22 10:03:46, we detected a possible BGP hijack.

Prefix 203.230.120.0/21, Normally announced by AS1237 KREONET-AS-KR KISTI, KR

Starting at 2020-12-22 10:03:46, a more specific route (203.230.121.0/24) was announced by ASN 9637.

This was detected by 131 BGPMon peers.

Expected
Start time: 2020-12-22 10:03:46 UTC
Expected prefix: 203.230.120.0/21
Expected ASN: 1237 (KREONET-AS-KR KISTI, KR)
Event Details
Detected advertisement: 203.230.121.0/24
Detected Origin ASN 9637 (KBSI-AS-KR KOREA BASIC SCIENCE INSTITUTE, KR)
Detected AS Path 35710 3320 1239 3786 3786 3786 9637 9637 9637 9637
Detected by number of BGPMon peers: 131

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