shell:$ nslookup -timeout=2 -retry=1 'speedtest.xfinity.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
speedtest.xfinity.com	canonical name = cdn.speedtest-prod.xcr.comcast.net.
Name:	cdn.speedtest-prod.xcr.comcast.net
Address: 96.113.134.226
Name:	cdn.speedtest-prod.xcr.comcast.net
Address: 96.113.134.227
Name:	cdn.speedtest-prod.xcr.comcast.net
Address: 2001:558:fe20:2c::3
Name:	cdn.speedtest-prod.xcr.comcast.net
Address: 2001:558:fe20:2c::2