$ dig @8.8.8.8 google.com
; <<>> DiG 9.7.0-P1 <<>> @8.8.8.8 google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61848
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 300 IN A 74.125.232.50
google.com. 300 IN A 74.125.232.48
google.com. 300 IN A 74.125.232.49
google.com. 300 IN A 74.125.232.51
google.com. 300 IN A 74.125.232.52
;; Query time: 122 msec
;; SERVER: 8.8.8.8#53(8.8.8.
;; WHEN: Mon Feb 14 11:57:33 2011
;; MSG SIZE rcvd: 108
$ dig @8.8.8.8 -x 74.125.232.50
; <<>> DiG 9.7.0-P1 <<>> @8.8.8.8 -x 74.125.232.50
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58987
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;50.232.125.74.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
125.74.in-addr.arpa. 60 IN SOA ns1.google.com. dns-admin.google.com. 1441859 21600 3600 1209600 10800
;; Query time: 108 msec
;; SERVER: 8.8.8.8#53(8.8.8.
;; WHEN: Mon Feb 14 11:57:41 2011
;; MSG SIZE rcvd: 104