nmap usage
 

Hi,

a shorrt question regarding nmap.

I want to scan for example all 10.0.0.0 network for hosts which have telnet open. and I want that nmap will show me just those portsI know that this is something I do with |grep but Im not sure.

can someone help please?

thanks

Juan

Try something along the lines of nmap -A -T4 10.*.*.* | egrep '(telnet|"Interesting ports"|PORT)' to give you the host it's currently scanning, the column headers and any lines that have "telnet" in them.

However, I'd modify those wildcards...! There are a whole _lot_ of combinations to be had from 3 wildcards, and I've no idea how long the command would actually take as written. If you only use 10.1.*.* on your network, use 10.1.*.* instead :)

If you see man nmap you will notice there is an option to check only for certain ports. It will only show that port and _only_ scan that port :) That is what you want, and it's faster than the 'grep' thing.
nmap 10.0.0.0/24 -p 23