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.
URI schemes registered with the IANA, both provisional and fully approved, are listed in its registry for Uniform Resource Identifier (URI) Schemes. These include well known schemes such as:
as well as many lesser known schemes such as:
Internet Engineering Task Force Best Current Practice (BCP) 35, Request for Comments (RFC) , Guidelines and Registration Procedures for URI Schemes (updated by RFC , Well-Known Uniform Resource Identifiers), defines the process for registering new URI scheme names. From time to time the process may change. The scheme registry maintains the mapping between scheme names and their specifications.