Книга: Fedora™ Unleashed, 2008 edition

dig

dig

The Domain Information Groper is a command-line utility that queries DNS nameservers. By default, dig uses the nameservers listed in /etc/resolv.conf and performs an NS (nameserver) query. Reverse lookups are accomplished with the -x argument with a default A (Address) query.

Here is an example of a forward lookup with dig:

$ dig www.pearson.com
; <<>> DiG 9.5.0a6 <<>> www.pearson.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5889
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3
;; QUESTION SECTION:
;www.pearson.com.               IN A
;; ANSWER SECTION:
www.pearson.com.          86400 IN A  195.69.212.200
;; AUTHORITY SECTION:
pearson.com.              46430 IN NS ns2.pearson.com.
pearson.com.              46430 IN NS oldtxdns2.pearsontc.com.
pearson.com.              46430 IN NS ns.pearson.com.
;; ADDITIONAL SECTION:
ns.pearson.com.          162044 IN A  195.69.213.15
ns2.pearson.com.          78028 IN A  195.69.215.15
oldtxdns2.pearsontc.com. 139762 IN A  192.251.135.15
;; Query time: 50 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Sun Oct 28 20:02:53 2007
;; MSG SIZE rcvd: 166

And here is a reverse lookup with dig:

$ dig 195.69.212.200
; <<>> DiG 9.5.0a6 <<>> 195.69.212.200
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 53249
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;195.69.212.200.                IN A
;; AUTHORITY SECTION:
.                         10800 IN SOA A.ROOT-SERVERS.NET. NSTLD.VERISIGN-GRS.COM. 2007102800 1800 900 604800 86400
;; Query time: 47 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Sun Oct 28 20:03:49 2007
;; MSG SIZE rcvd: 107

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