Possible BGP hijack

Beginning at 2019-02-19 14:28:21 UTC, we detected a possible BGP hijack.

Prefix 162.252.156.0/22, is normally announced by AS8560 ONEANDONE-AS Brauerstrasse 48, DE.

But beginning at 2019-02-19 14:28:21, the same prefix (162.252.156.0/22) was also announced by ASN 20718.

This was detected by 72 BGPMon peers.

Expected
Start time: 2019-02-19 14:28:21 UTC
Expected prefix: 162.252.156.0/22
Expected ASN: 8560 (ONEANDONE-AS Brauerstrasse 48, DE)
Event Details
Detected advertisement: 162.252.156.0/22
Detected Origin ASN 20718 (AS_ARSYS-EURO-1 ============================================================, ES)
Detected AS Path 135328 6939 20718
Detected by number of BGPMon peers: 72

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