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17.2.4. Using the dig Utility
The
dig utility is a command-line tool that allows you to perform DNS lookups and debug a nameserver configuration. Its typical usage is as follows:
dig [@server] [option...] name type
See Section 17.2.2.2, “Common Resource Records” for a list of common types.
17.2.4.1. Looking Up a Nameserver
To look up a nameserver for a particular domain, use the command in the following form:
dig name NS
In Example 17.17, “A sample nameserver lookup”, the
dig utility is used to display nameservers for example.com.
Example 17.17. A sample nameserver lookup
~]$ dig example.com NS
; <<>> DiG 9.7.1-P2-RedHat-9.7.1-2.P2.fc13 <<>> example.com NS
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57883
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;example.com. IN NS
;; ANSWER SECTION:
example.com. 99374 IN NS a.iana-servers.net.
example.com. 99374 IN NS b.iana-servers.net.
;; Query time: 1 msec
;; SERVER: 10.34.255.7#53(10.34.255.7)
;; WHEN: Wed Aug 18 18:04:06 2010
;; MSG SIZE rcvd: 77
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