Browse DevX
Sign up for e-mail newsletters from DevX

Tip of the Day
Language: Java
Expertise: Beginner
Apr 28, 2000



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Range of Ports Available to ServerSockets

The java.net.ServerSocket class implements a server socket. A server socket waits for requests to come in over the network. It performs some operation based on that request, and then possibly returns a result to the requester.

The constructors of java.net.ServerSocket have an int parameter for the port number the socket is supposed to listen to, as in
"public ServerSocket(int port) throws IOException" 
ServerSockets can be created to listen on port numbers from 1 to 65535. However, port numbers 1 up to, and including 255 are reserved for services such as telnet (23), ftp (21), http (80), and so on. On UNIX platform, port numbers less than 1024 require root access.

Also, setting the port number of a ServerSocket to zero will let the server to choose an unused port on random.
Behrouz Fallahi
Thanks for your registration, follow us on our social networks to keep up-to-date