shell:$ nslookup -timeout=2 -retry=1 'www.tehraninternet.co.ir'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
www.tehraninternet.co.ir	canonical name = tehraninternet.co.ir.
Name:	tehraninternet.co.ir
Address: 176.9.242.251