how to check open ports of bunch of website at once with nmap/linux?

Question

I want to use nmap in such a way that I could check bunch of server's port at once for checking whether their particular port is open or not? right now I have 10 ip addresses but in future this could be more . I know the very basic command in linux like cat/nano/piping but I don't know how can I feed to nmap the list of my servers to open them one by one and return the result.

score 4 · Accepted Answer · answered May 12 '10 at 04:22

4

Say you have a file named "server_ips" with the IPs listed as such:

1.2.3.4
2.3.4.5
3.4.5.6
4.5.6.7
etc...

Then you could do the following:

$ cat server_ips | xargs nmap <nmap_options>

answered May 12 '10 at 04:22

EEAA

109,363
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You can also use the -iL option which accepts a file containing one IP/hostname/netblock per line. – jah Mar 08 '11 at 23:35

score 0 · Answer 2 · answered Jul 13 '16 at 14:32

0

Write a target list of IPs or domains in a file, then

nmap -iL targetfile

This way nmap will take care of optimization and performance.

answered Jul 13 '16 at 14:32

blau

738
4
9

how to check open ports of bunch of website at once with nmap/linux?

2 Answers2