Possible BGP hijack

Beginning at 2019-09-25 12:59:50 UTC, we detected a possible BGP hijack.

Prefix 146.16.128.0/22, is normally announced by AS1501 DNIC-ASBLK-01500-01502 - Headquarters, USAISC, US.

But beginning at 2019-09-25 12:59:50, the same prefix (146.16.128.0/22) was also announced by ASN 52871.

This was detected by 3 BGPMon peers.

Expected
Start time: 2019-09-25 12:59:50 UTC
Expected prefix: 146.16.128.0/22
Expected ASN: 1501 (DNIC-ASBLK-01500-01502 - Headquarters, USAISC, US)
Event Details
Detected advertisement: 146.16.128.0/22
Detected Origin ASN 52871 (TASCOM TELECOMUNICAÇÕES LTDA, BR)
Detected AS Path 133812 137363 58552 9002 3491 58453 7738 7738 52871
Detected by number of BGPMon peers: 3

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