shell:$ nslookup -timeout=2 -retry=1 'simso.mobifone.vn'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	simso.mobifone.vn
Address: 45.121.26.199
Name:	simso.mobifone.vn
Address: 45.121.26.198