how to scan ports of your computer.

scanning of port means to see the list of open ports on your pc.

steps:

[1] Open the command prompt

[2]Type:

     netstat -a    or

     netstat -a -n (along with port number)   or

     netstat -ano (along with port number)  

Port numbers are divided into tree ranges:

1.well-known ports: (0-1023)

   This range or ports are bound to the service running on them means each port usually has a specific service running on it.For example or normally FTP runs on port 21 and default port for HTTP is 80.

2.Registered ports:(1024-49151)

   This range or ports are not bound to any specific service. Networking utilities like your browsers, Email Client, FTP software opens a random port within this range and start communication with  remote server.

3.Dynamic and/or Private ports:(49152-65535)

   This range is rarely used ,and is mostly used by trojans , however some application do tend to use such high range port numbers.