Possible BGP hijack

Beginning at 2023-08-29 17:55:13, we detected a possible BGP hijack.

Prefix 156.243.128.0/17, Normally announced by AS984 Unknown

Starting at 2023-08-29 17:55:13, a more specific route (156.243.224.0/20) was announced by ASN 7018.

This was detected by 26 BGPMon peers.

Expected
Start time: 2023-08-29 17:55:13 UTC
Expected prefix: 156.243.128.0/17
Expected ASN: 984 (Unknown)
Event Details
Detected advertisement: 156.243.224.0/20
Detected Origin ASN 7018 (ATT-INTERNET4, US)
Detected AS Path 8781 6762 7018
Detected by number of BGPMon peers: 26

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