UNIX for Dummies Questions & Answers

I am trying to determine if there are several url/host names for an IP address. Is there a UNIX command to find ALL host names for an IP address?

Thank you in advance.

You can use dig


dig -x ipaddr

Check the man page for more details

Generally the hostname command will let you to know about your hostname for the specified IP address.
If there is some alias you have to use the --alias option. The hostname entries will be available in /etc/hostname file
So using cat /etc/hostname you can know the hostnames of your IP.

Thank you for responding. I tried "dig -x <ipaddress>", but it did not return the host names and returned the below. There are websites like dm.tj12.net that can perform Reverse IP and show ALL host names, but I wanted to know what command they were running. If you could share this information, that would be great.

; <<>> DiG 9.4.3-P1 <<>> -x 208.76.86.26
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29540
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;26.86.76.208.in-addr.arpa. IN PTR

;; ANSWER SECTION:
26.86.76.208.in-addr.arpa. 86400 IN PTR memphis.tchmachines.com.

;; Query time: 428 msec
;; SERVER: 192.168.33.1#53(192.168.33.1)
;; WHEN: Tue Feb 23 17:58:38 2010
;; MSG SIZE rcvd: 80