The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
The host utility is recommended for performing
DNS lookups. Without any arguments, host
displays a summary of its command-line arguments and options. For
example, look up the IP address for host01
:
$ host host01
Perform a reverse lookup for the domain name that corresponds to an IP address:
$ host 192.168.2.101
Query DNS for the IP address that corresponds to a domain:
$ host dns.us.mydoc.com
Use the -v and -t options to display verbose information about records of a certain type:
$ host -v -t MX www.mydom.com
Trying "www.mydom.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49643
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;www.mydom.com. IN MX
;; ANSWER SECTION:
www.mydom.com. 135 IN CNAME www.mydom.com.acme.net.
www.mydom.com.acme.net. 1240 IN CNAME d4077.c.miscacme.net.
;; AUTHORITY SECTION:
c.miscacme.net. 2000 IN SOA m0e.miscacme.net. hostmaster.misc.com. ...
Received 163 bytes from 10.0.0.1#53 in 40 ms
The -a option (equivalent to -v -t ANY) displays all available records for a zone:
$ host -a www.us.mydom.com
Trying "www.us.mydom.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40030
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.us.mydom.com. IN ANY
;; ANSWER SECTION:
www.us.mydom.com. 263 IN CNAME www.us.mydom.acme.net.
Received 72 bytes from 10.0.0.1#53 in 32 ms
For more information, see the host(1)
manual
page.