Possible BGP hijack

Beginning at 2020-06-24 15:20:15, we detected a possible BGP hijack.

Prefix 172.58.0.0/21, Normally announced by AS21928 T-MOBILE-AS21928, US

Starting at 2020-06-24 15:20:15, a more specific route (172.58.0.0/24) was announced by ASN 22381.

This was detected by 100 BGPMon peers.

Expected
Start time: 2020-06-24 15:20:15 UTC
Expected prefix: 172.58.0.0/21
Expected ASN: 21928 (T-MOBILE-AS21928, US)
Event Details
Detected advertisement: 172.58.0.0/24
Detected Origin ASN 22381 (Megatelecom Telecomunicacoes Ltda, BR)
Detected AS Path 131477 54574 6461 12956 22381
Detected by number of BGPMon peers: 100

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