An application-level protocol used to obtain resources on the Internet. Following are some of the common URI schemes, all of which ride over TCP/IP. See URI and URL.

 URI SCHEME

 Prefix   To gain access to

 http:    Web server
 https:   secure Web server
 ftp:     file server
 im:      instant messaging

 news:    Usenet newsgroups
 nntp:    Usenet newsgroups

 mailto:  send e-mail (SMTP)
 imap:    IMAP mailbox
 pop:     POP mailbox

 sip:     voice over IP (VoIP)
 sips:    secure VoIP
 h323:    H.323 videoconference

 ldap:    directory request
 telnet:  run program

 nfs:     network file system
 wais:    WAIS server
 gopher:  Gopher server

 file:    local file on host

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