reverse (batch) dns lookup

aptget · 09-29-2009, 01:59 PM

Hello,

I have a long list of IPs in an ASCII text file (over 200 IPs). I would like to perform reverse dns lookup for these IPs.

Can anyone tell me if there is some sort of perl script (dig, host, nsllokup, etc) that I can run against this text file that would let me pipe the results to another file. I've searched through the forum w/ no avail.

Any help or suggestions would be greatly appreciated!

regards,
sky

acid_kewpie · 09-29-2009, 02:12 PM

for i in $(cat input.txt)
do
host $i
done > output.txt

aptget · 09-29-2009, 02:30 PM

Hi,

Pardon my ignorance, when I ran this in a file didn't do anything.

Do you I need make the file executable (chmod 755)?

regards,
sky

aptget · 09-29-2009, 03:00 PM

Never mind, I figure out what was wrong - thanks!

regards,
sky