Possible BGP hijack

Beginning at 2021-04-20 17:35:55, we detected a possible BGP hijack.

Prefix 208.164.0.0/15, Normally announced by AS3561 CENTURYLINK-LEGACY-SAVVIS, US

Starting at 2021-04-20 17:35:55, a more specific route (208.165.48.0/20) was announced by ASN 11830.

This was detected by 127 BGPMon peers.

Expected
Start time: 2021-04-20 17:35:55 UTC
Expected prefix: 208.164.0.0/15
Expected ASN: 3561 (CENTURYLINK-LEGACY-SAVVIS, US)
Event Details
Detected advertisement: 208.165.48.0/20
Detected Origin ASN 11830 (Instituto Costarricense de Electricidad y Telecom., CR)
Detected AS Path 8319 33891 1299 1239 11830
Detected by number of BGPMon peers: 127

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