shell:$ nslookup -timeout=2 -retry=1 'pec.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: pec.ir Address: 212.80.25.91 ;; communications error to 1.1.1.1#53: timed out