shell:$ nslookup -timeout=2 -retry=1 'bdg.yu.ac.ir'
;; communications error to 75.98.161.224#53: timed out
Server:		69.39.86.5
Address:	69.39.86.5#53

Non-authoritative answer:
Name:	bdg.yu.ac.ir
Address: 5.160.140.29