Possible BGP hijack

Beginning at 2019-03-19 09:01:58 UTC, we detected a possible BGP hijack.

Prefix 177.73.128.0/21, is normally announced by AS19750 AS-CRITEO - Criteo Corp., US.

But beginning at 2019-03-19 09:01:58, the same prefix (177.73.128.0/21) was also announced by ASN 53031.

This was detected by 41 BGPMon peers.

Expected
Start time: 2019-03-19 09:01:58 UTC
Expected prefix: 177.73.128.0/21
Expected ASN: 19750 (AS-CRITEO - Criteo Corp., US)
Event Details
Detected advertisement: 177.73.128.0/21
Detected Origin ASN 53031 (Criteo do Brasil Desenvolvimento de Serv Internet, BR)
Detected AS Path 18356 38794 45796 6939 61317 61440 53031
Detected by number of BGPMon peers: 41

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