Possible BGP hijack

Beginning at 2018-12-19 16:24:16, we detected a possible BGP hijack.

Prefix 100.128.0.0/9, Normally announced by AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc., US

Starting at 2018-12-19 16:24:16, a more specific route (100.154.0.0/17) was announced by ASN 7552.

This was detected by 192 BGPMon peers.

Expected
Start time: 2018-12-19 16:24:16 UTC
Expected prefix: 100.128.0.0/9
Expected ASN: 21928 (T-MOBILE-AS21928 - T-Mobile USA, Inc., US)
Event Details
Detected advertisement: 100.154.0.0/17
Detected Origin ASN 7552 (VIETEL-AS-AP Viettel Group, VN)
Detected AS Path 53137 25933 3549 3356 1299 7473 7552 7552 7552 7552 7552 7552
Detected by number of BGPMon peers: 192

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