shell:$ nslookup -timeout=2 -retry=1 'mex.att.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
mex.att.com	canonical name = link.att.com.edgekey.net.
link.att.com.edgekey.net	canonical name = e11697.dscx.akamaiedge.net.
Name:	e11697.dscx.akamaiedge.net
Address: 23.39.214.34
Name:	e11697.dscx.akamaiedge.net
Address: 2600:140a:5000:b8a::2db1
Name:	e11697.dscx.akamaiedge.net
Address: 2600:140a:5000:b85::2db1