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List of common Internet protocols. 1  HTTP (Hypertext Transfer Protocol): allows you to share Web pages between a client and a server. 2  FTP (File Transfer Protocol) to transfer files to a server.  DNS (Domain Name System) allows to establish the link between a domain name and IP address (Internet Protocol).
There are a total of 65535 ports available for use in the TCP/IP framework, and ports 0-1023 are considered âwell knownâ ports. Here is a list of ports which are commonly used and essential in server-side Internet communications: 20/21 â File Transfer Protocol (FTP): used for uploading and downloading files to and from a server. 25 â Simple Mail Transfer Protocol (SMTP): used for sending emails through a server.