Find active servers in subnet

Andreas

2019-07-01 18:00

I needed an org-mode table with a list of all currently used IP addresses in a subnet.

#+BEGIN_SRC bash
  nmap -sP 10.7.2.0/24 | grep "scan report" | cut -d" " -f5 | sort -V
#+END_SRC

#+RESULTS:
|   10.7.2.1 |
|   10.7.2.2 |
|  10.7.2.23 |

The nmap command returns for each server 2 lines.
The line with the IP address contains "scan report".

cut splits the IP address from the line and sort -V sorts by IP address.

To run a command in org-mode you press C-c C-c inside the region and answer the security question with y.