Despite the “old school” nature of this raw tool, another excellent utility is netcat (or nc),
written by Hobbit. This utility can perform so many tasks that everyone in the industry
calls it the Swiss Army knife of security.nc provides basic TCP and UDP port-scanning capabilities.
The –v and –vv options provide verbose and very verbose output, respectively. The –z
option provides zero mode I/O and is used for port scanning, and the –w2 option
provides a timeout value for each connection. By default, nc will use TCP ports. Therefore,
we must specify the –u option for UDP scanning, as a example shown next:
[root] nc -v -z -w2 192.168.1.1 1-140
[192.168.1.1] 139 (?) open
[192.168.1.1] 135 (?) open
[192.168.1.1] 110 (pop-3) open
[192.168.1.1] 106 (?) open
[192.168.1.1] 81 (?) open
[192.168.1.1] 80 (http) open
[192.168.1.1] 79 (finger) open
[192.168.1.1] 53 (domain) open
[192.168.1.1] 42 (?) open
[192.168.1.1] 25 (smtp) open
[192.168.1.1] 21 (ftp) open
[192.168.1.1] 135 (ntportmap) open
[192.168.1.1] 123 (ntp) open
[192.168.1.1] 53 (domain) open
[192.168.1.1] 42 (name) open
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