List of URI schemes

This article lists common URI schemes. A Uniform Resource Identifier helps identify a source without ambiguity. Many URI schemes are registered with the IANA; however, there exist many unofficial URI schemes as well. Mobile deep links are one example of a class of unofficial URI schemes that allow for linking directly to a specific location in a mobile app.

Official IANA-registered schemes
URI schemes registered with the IANA, both provisional and fully approved, are listed in its registry. These include well known ones like: as well as many lesser known schemes like:
 * ftp – File Transfer Protocol
 * http – Hypertext Transfer Protocol
 * https – Hypertext Transfer Protocol Secure
 * imap – Internet Message Access Protocol
 * irc – Internet Relay Chat
 * nntp – Network News Transfer Protocol
 * acap – Application Configuration Access Protocol
 * icap – Internet Content Adaptation Protocol
 * mtqp – Message Tracking Query Protocol (RFC 3887)
 * wss – Encrypted WebSocket connections