Possible BGP hijack

Beginning at 2021-09-12 01:09:40, we detected a possible BGP hijack.

Prefix 122.248.16.0/21, Normally announced by AS4352 EMRNET-AS-HK-AP Emerson, HK

Starting at 2021-09-12 01:09:40, a more specific route (122.248.19.0/24) was announced by ASN 19905.

This was detected by 120 BGPMon peers.

Expected
Start time: 2021-09-12 01:09:40 UTC
Expected prefix: 122.248.16.0/21
Expected ASN: 4352 (EMRNET-AS-HK-AP Emerson, HK)
Event Details
Detected advertisement: 122.248.19.0/24
Detected Origin ASN 19905 (NEUSTAR-AS6, US)
Detected AS Path 48659 3257 22822 19905
Detected by number of BGPMon peers: 120

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