shell:$ nslookup -timeout=2 -retry=1 'mmsc.mobile.att.net'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
mmsc.mobile.att.net	canonical name = mmsc.gslb.mobile.att.net.
Name:	mmsc.gslb.mobile.att.net
Address: 166.137.91.129