Code:
> dig bcmailbox.hcjbc.org. A
; <<>> DiG 9.6.1-P3-RedHat-9.6.1-10.P3.fc11 <<>> bcmailbox.hcjbc.org. A
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4030
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0
;; QUESTION SECTION:
;bcmailbox.hcjbc.org. IN A
;; ANSWER SECTION:
bcmailbox.hcjbc.org. 38400 IN A 10.100.177.200
;; AUTHORITY SECTION:
hcjbc.org. 38400 IN NS 10.100.177.205.
hcjbc.org. 38400 IN NS 10.100.177.200.
;; Query time: 6 msec
;; SERVER: 10.100.177.205#53(10.100.177.205)
;; WHEN: Thu Feb 11 22:12:59 2010
;; MSG SIZE rcvd: 109
All is well, until ...
Code:
> dig -x 10.100.177.200
; <<>> DiG 9.6.1-P3-RedHat-9.6.1-10.P3.fc11 <<>> -x 10.100.177.200
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 991
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;200.177.100.10.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
10.in-addr.arpa. 8820 IN SOA prisoner.iana.org. hostmaster.root-servers.org. 2002040800 1800 900 604800 604800
;; Query time: 2 msec
;; SERVER: 10.100.177.205#53(10.100.177.205)
;; WHEN: Thu Feb 11 22:13:04 2010
;; MSG SIZE rcvd: 122