shell:$ nslookup -timeout=2 -retry=1 'www.bertina.ir'
;; communications error to 1.1.1.1#53: timed out
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	www.bertina.ir
Address: 78.46.29.100
;; communications error to 1.1.1.1#53: timed out
;; communications error to 8.8.8.8#53: timed out
;; no servers could be reached