Possible BGP hijack

Beginning at 2021-09-20 12:27:06, we detected a possible BGP hijack.

Prefix 100.128.0.0/9, Normally announced by AS21928 T-MOBILE-AS21928, US

Starting at 2021-09-20 12:27:06, a more specific route (100.200.0.0/20) was announced by ASN 203600.

This was detected by 35 BGPMon peers.

Expected
Start time: 2021-09-20 12:27:06 UTC
Expected prefix: 100.128.0.0/9
Expected ASN: 21928 (T-MOBILE-AS21928, US)
Event Details
Detected advertisement: 100.200.0.0/20
Detected Origin ASN 203600 (TVLOJA, ES)
Detected AS Path 37989 4844 7473 6461 5511 12479 203600
Detected by number of BGPMon peers: 35

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