Step 1: Send the following text message - PORT followed by your 10-digit mobile number to TRAI's central number for mobile number portability - 1900. Example: Send 'PORT 98xxxxxx98' to 1900. You'll receive an SMS back with a Port out code.
Then type “netstat -a” and press “Enter.” A list of all your active TCP/IP connections will populate. The port numbers appear after the IP address with a colon separating the two. For example, if your IP address is 192.168.1.1 and you see an entry for 192.168.1.1:2869, it means port 2869 is open.
A port number is a way to identify a specific process to which an Internet or other network message is to be forwarded when it arrives at a server.
For the Transmission Control Protocol and the User Datagram Protocol, a port number is a 16-bit integer that is put in the header appended to a message unit.
This port number is passed logically between client and server transport layers and physically between the transport layer and the Internet Protocol layer and forwarded on.
Some ports number in the below:
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