host

# host yahoo.com
yahoo.com has address 98.139.183.24
yahoo.com has address 206.190.36.45
yahoo.com has address 98.138.253.109
yahoo.com mail is handled by 1 mta5.am0.yahoodns.net.
yahoo.com mail is handled by 1 mta6.am0.yahoodns.net.
yahoo.com mail is handled by 1 mta7.am0.yahoodns.net.

ping

# ping google.com -c 1
PING google.com (173.194.127.110) 56(84) bytes of data.
64 bytes from hkg03s12-in-f14.1e100.net (173.194.127.110): icmp_seq=1 ttl=52 time=68.7 ms

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 133ms
rtt min/avg/max/mdev = 68.767/68.767/68.767/0.000 ms

nslookup

# nslookup google.com
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	google.com
Address: 173.194.127.102
Name:	google.com
Address: 173.194.127.103
Name:	google.com
Address: 173.194.127.98
Name:	google.com
Address: 173.194.127.110
Name:	google.com
Address: 173.194.127.99
Name:	google.com
Address: 173.194.127.104
Name:	google.com
Address: 173.194.127.101
Name:	google.com
Address: 173.194.127.97
Name:	google.com
Address: 173.194.127.105
Name:	google.com
Address: 173.194.127.100
Name:	google.com
Address: 173.194.127.96

nslookup명령어는 반대로 ip를 입력해 dns를 확인할 수도 있습니다. 그러나 ip를 입력해 dns를 반드시 찾을 수 있는 것은 아닙니다. IP만 있고, 도메인과 연결하지 않은 컴퓨터도 있기 때문입니다.