shell:$ nslookup -timeout=2 -retry=1 'simso.mobifone.vn'
Server:		1.1.1.1
Address:	1.1.1.1#53

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