These AS numbers names were collected from 505 days of continuous recording of Windows Server 2016 telemetry traffic. Virtual machine and traffic recording software was configured as explained here. Raw traffic dumps were processed as explained here.

First list of AS numbers has 20 entries, sorted in descending order by total outgoing traffic transmitted by Windows Server 2016. Second list of AS numbers has 18 entries, sorted in descending order by total incoming traffic received by Windows Server 2016. Telemetry level was set to zero (Security), other settings were left at their defaults, and there was no third party software installed.

Outgoing Windows Server 2016 traffic (breakdown by AS)

Incoming Windows Server 2016 traffic (breakdown by AS)