shell:$ nslookup -timeout=2 -retry=1 'www.topnet.tn'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
www.topnet.tn	canonical name = topnet.tn.
Name:	topnet.tn
Address: 41.231.5.200
Name:	topnet.tn
Address: ::ffff:41.231.5.52