root@dns:/home# dig -x IP

root@dns:/home# dig @<DNS> -x IP

root@dns:/home# dig relaismail.ensai.fr

; <<>> DiG 9.7.3 <<>> relaismail.ensai.fr
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49837
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;relaismail.ensai.fr. IN A

;; ANSWER SECTION:
relaismail.ensai.fr. 33586 IN A 195.220.86.37

;; Query time: 0 msec
;; SERVER: 10.165.120.10#53(10.165.120.10)
;; WHEN: Fri Mar 21 10:10:20 2014
;; MSG SIZE rcvd: 53

root@dns:/home#

root@dns:/home# dig MX ensai.fr

; <<>> DiG 9.7.3 <<>> MX ensai.fr
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5115
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;ensai.fr. IN MX

;; ANSWER SECTION:
ensai.fr. 35925 IN MX 0 relaismail.ensai.fr.

;; ADDITIONAL SECTION:
relaismail.ensai.fr. 34055 IN A 195.220.86.37

;; Query time: 0 msec
;; SERVER: 10.165.120.10#53(10.165.120.10)
;; WHEN: Fri Mar 21 10:02:32 2014
;; MSG SIZE rcvd: 69

root@dns:/home#

root@dns:/home# dig @dnsext.ensai.fr relaismail.ensai.fr

; <<>> DiG 9.7.3 <<>> @dnsext.ensai.fr relaismail.ensai.fr
; (4 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62001
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;relaismail.ensai.fr. IN A

;; ANSWER SECTION:
relaismail.ensai.fr. 86400 IN A 195.220.86.37

;; AUTHORITY SECTION:
ensai.fr. 86400 IN NS comserv2.ensae.fr.
ensai.fr. 86400 IN NS dnsext.ensai.fr.

;; ADDITIONAL SECTION:
dnsext.ensai.fr. 86400 IN A 195.220.86.36

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Mar 21 10:16:42 2014
;; MSG SIZE rcvd: 119

root@dns:/home#

+[no]search
Use [do not use] the search list defined by the searchlist or
domain directive in resolv.conf (if any). The search list is not
used by default.