Possible BGP hijack

Beginning at 2023-05-19 14:04:11, we detected a possible BGP hijack.

Prefix 133.23.0.0/16, Normally announced by AS2907 SINET-AS Research Organization of Information and Systems, National Institute of Informatics, JP

Starting at 2023-05-19 14:04:11, a more specific route (133.23.32.0/24) was announced by ASN 262888.

This was detected by 5 BGPMon peers.

Expected
Start time: 2023-05-19 14:04:11 UTC
Expected prefix: 133.23.0.0/16
Expected ASN: 2907 (SINET-AS Research Organization of Information and Systems, National Institute of Informatics, JP)
Event Details
Detected advertisement: 133.23.32.0/24
Detected Origin ASN 262888 (LPRINT TELECOMUNICACOES E ENGENHARIA LTDA, BR)
Detected AS Path 28130 16735 53013 264459 262888
Detected by number of BGPMon peers: 5

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