[Advance Java] What is a TCP Port?

A TCP port is just a number, a 16-bit number that identifies a specific software program on the server hardware. 

Def: A port represents a logical connection to a particular piece of software running on the server hardware.
Your internet web (HTTP) server software runs on port 80. That’s a standard. If you’ve got a Telnet server, it’s running on port 23. FTP? 21. POP3 mail server? 110. SMTP? 25. The Time server sits at 37. Think of ports as unique identifiers. 


Using one server app per port, a server can have up to 65536 different server apps running, i.e. there could be 65536 port in a server hardware.


The TCP port numbers from 0 to 1023 are reserved for well-known services (including the Big One we care about— port 80). Don’t use these ports for your own custom server programs!



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