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Dig that!

Here are some handy ‘dig’ commands to verify DNS records:

Do a hostname lookup

# dig www.google.com

; <<>> DiG 9.4.1 <<>> www.google.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 76
;; flags: qr rd ra; QUERY: 1, ANSWER: 7, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.                        IN      A

;; ANSWER SECTION:
www.google.com.         84790   IN      CNAME   www.l.google.com.
www.l.google.com.       259     IN      A       209.85.148.104
www.l.google.com.       259     IN      A       209.85.148.105
www.l.google.com.       259     IN      A       209.85.148.106
www.l.google.com.       259     IN      A       209.85.148.147
www.l.google.com.       259     IN      A       209.85.148.99
www.l.google.com.       259     IN      A       209.85.148.103

;; Query time: 119 msec
;; SERVER: 10.0.0.8#53(10.0.0.8)
;; WHEN: Wed Sep 28 13:23:41 2011
;; MSG SIZE  rcvd: 148

 

Get a short answer

# dig www.google.com +short

www.l.google.com.
209.85.148.99
209.85.148.103
209.85.148.104
209.85.148.105
209.85.148.106
209.85.148.147

Get just the answer section

# dig www.google.com +noall +answer

www.google.com.         84278   IN      CNAME   www.l.google.com.
www.l.google.com.       49      IN      A       209.85.148.105
www.l.google.com.       49      IN      A       209.85.148.106
www.l.google.com.       49      IN      A       209.85.148.147
www.l.google.com.       49      IN      A       209.85.148.99
www.l.google.com.       49      IN      A       209.85.148.103
www.l.google.com.       49      IN      A       209.85.148.104

Do a reverse lookup

# dig -x 209.85.148.105 +noall +answer

105.148.85.209.in-addr.arpa. 45351 IN   PTR     fra07s07-in-f105.1e100.net.

Use your ‘search’ string from the /etc/resolv.conf

#dig www.google.com +search

Reference:

http://www.madboa.com/geek/dig/

http://linux.die.net/man/1/dig

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