Forward versus reverse name resolution
We have seen DNS translate a name to an IP address, DNS can also do IP address to name translations.
Now sometimes you might need this - if I gave you an address of 196.7.138.125 you
might want to know what name this is.
So we have a means where DNS converts from an IP address back to a name and we can use
our dig command again - "dig -x 196.7.138.125" It does a reverse
translation - and 196.7.138.125 should give us a name in return.
debian:/ # dig -x 196.35.20.131
; <<>> DiG 9.2.3 <<>> -x 196.35.20.131
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 27898
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;131.20.35.196.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
35.196.in-addr.arpa. 10463 IN SOA ns1.is.co.za. \
dns-admin.is.co.za. 2004072000 28800 7200 604800 86400
;; Query time: 4 msec
;; SERVER: 192.168.2.7#53(192.168.2.7)
;; WHEN: Tue Jul 20 11:41:24 2004
;; MSG SIZE rcvd: 102
debian:/ #
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