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Port Scanner
A port scanner is the software that searches a host for open ports. They
can be used for good as when administrators verify their own network or
they can be used for evil, to find vulnerabilities and eventually to
gain unauthorised access. A quick way to check the localhost for open
ports is to do: netstat -a and all ports which appear in LISTEN status,
are opened. Please notice that some ports may be opened only on the
local interface (127.0.0.1) and may not be opened on your real IP (on
your IP over the Internet which anyone can access).
There are 65535 diferent and usable port numbers. Most services have
default ports: 80 for httpd, 21 for ftpd, 25 for sendmail, etc. If you
run Linux you can see a list in /etc/services .
Probably the best program that you can use to make port scans, is nmap.
It is open source and you can use it for free. It can be downloaded from
http://www.insecure.org/nmap .
It has a lot of advanced options but
still it's easy to use for beginners too.
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