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dig


Detailed answer
$ dig www.gwu.edu

; <<>> DiG 9.7.0-P1 <<>> www.gwu.edu
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21046
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.gwu.edu.                   IN      A

;; ANSWER SECTION:
www.gwu.edu.            60      IN      A       128.164.131.179

;; Query time: 252 msec
;; SERVER: 10.241.36.15#53(10.241.36.15)
;; WHEN: Mon Jun  6 10:22:15 2011
;; MSG SIZE  rcvd: 45

brief answer
$ dig www.gwu.edu +noall +answer

; <<>> DiG 9.7.0-P1 <<>> www.gwu.edu +noall +answer
;; global options: +cmd
www.gwu.edu.            35      IN      A       161.253.149.179

short answer:
$ dig www.gwu.edu +short
128.164.131.179

reverse:
$ dig -x 204.152.184.167 +short
mx.isc.org.

different nameserver
$ dig @ns1.google.com www.google.com





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