Possible BGP hijack

Beginning at 2023-11-24 20:32:53 UTC, we detected a possible BGP hijack.

Prefix 202.27.128.0/23, is normally announced by AS4637 ASN-TELSTRA-GLOBAL Telstra Global, HK.

But beginning at 2023-11-24 20:32:53, the same prefix (202.27.128.0/23) was also announced by ASN 4768.

This was detected by 13 BGPMon peers.

Expected
Start time: 2023-11-24 20:32:53 UTC
Expected prefix: 202.27.128.0/23
Expected ASN: 4637 (ASN-TELSTRA-GLOBAL Telstra Global, HK)
Event Details
Detected advertisement: 202.27.128.0/23
Detected Origin ASN 4768 (VFNZ-INET-AS Vodafone NZ Ltd, NZ)
Detected AS Path 394256 6939 9500 9901 4768
Detected by number of BGPMon peers: 13

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