Port 8080 is a port number that is usually used for web servers, proxy, and caching. It is a common alternative HTTP port used for web traffic and can also be used for HTTP web proxies. Port 8080 is generally used by web servers to make TCP connections if the default port 80 is busy. It was chosen because it is "two 80s", and also because it is above the restricted well-known port. When a port number is added to the end of the domain name, it drives traffic to the web server. However, users cannot reserve port 8080 for secondary web servers. Port 8080 is a user or registered port, while port 80 is a well-known port. Ports below 1024 need system user permission like root or something, which is why ports in the thousands are used for software running as a normal user.