Port 80

Port 80 may refer to:

• in Internet — TCP port 80, most often used by Hypertext Transfer Protocol
• regarding IBM PC — I/O port 80, used by POST error reporting

In a Web server or Hypertext Transfer Protocol daemon, port 80 is the port that the server "listens to" or expects to receive from a Web client, assuming that the default was taken when the server was configured or set up. A port can be specified in the range from 0-65536 on the NCSA server. However, the server administrator configures the server so that only one port number can be recognized. By default, the port number for a Web server is 80. Experimental services may sometimes be run at port 8080.