Uniform Resource Identifier (URI) Schemes

Last Updated
Registration Procedure(s)
Expert Review
Graham Klyne
[RFC4395] defines an IANA-maintained registry of URI Schemes. 
These registries include the Permanent and Provisional URI Schemes.
Available Formats



Plain text

Registries included below

Permanent URI Schemes

Available Formats

URI Scheme Template Description Reference
aaa Diameter Protocol [RFC6733]
aaas Diameter Protocol with Secure Transport [RFC6733]
about about [RFC6694]
acap application configuration access protocol [RFC2244]
acct acct [RFC-ietf-appsawg-acct-uri-06]
cap Calendar Access Protocol [RFC4324]
cid content identifier [RFC2392]
coap coap [RFC7252]
coaps coaps [RFC7252]
crid TV-Anytime Content Reference Identifier [RFC4078]
data data [RFC2397]
dav dav [RFC4918]
dict dictionary service protocol [RFC2229]
dns Domain Name System [RFC4501]
file Host-specific file names [RFC1738]
ftp File Transfer Protocol [RFC1738]
geo Geographic Locations [RFC5870]
go go [RFC3368]
gopher The Gopher Protocol [RFC4266]
h323 H.323 [RFC3508]
http Hypertext Transfer Protocol [RFC7230, Section 2.7.1]
https Hypertext Transfer Protocol Secure [RFC7230, Section 2.7.2]
iax Inter-Asterisk eXchange Version 2 [RFC5456]
icap Internet Content Adaptation Protocol [RFC3507]
im Instant Messaging [RFC3860]
imap internet message access protocol [RFC5092]
info Information Assets with Identifiers in Public Namespaces [RFC4452]
ipp Internet Printing Protocol [RFC3510]
ipps Internet Printing Protocol over HTTPS [RFC-mcdonald-ipps-uri-scheme-18]
iris Internet Registry Information Service [RFC3981]
iris.beep iris.beep [RFC3983]
iris.xpc iris.xpc [RFC4992]
iris.xpcs iris.xpcs [RFC4992]
iris.lwz iris.lwz [RFC4993]
jabber perm/jabber jabber [Peter_Saint-Andre]
ldap Lightweight Directory Access Protocol [RFC4516]
mailto Electronic mail address [RFC6068]
mid message identifier [RFC2392]
msrp Message Session Relay Protocol [RFC4975]
msrps Message Session Relay Protocol Secure [RFC4975]
mtqp Message Tracking Query Protocol [RFC3887]
mupdate Mailbox Update (MUPDATE) Protocol [RFC3656]
news USENET news [RFC5538]
nfs network file system protocol [RFC2224]
ni ni [RFC6920]
nih nih [RFC6920]
nntp USENET news using NNTP access [RFC5538]
opaquelocktoken opaquelocktokent [RFC4918]
pkcs11 PKCS#11 [RFC-pechanec-pkcs11uri-21]
pop Post Office Protocol v3 [RFC2384]
pres Presence [RFC3859]
reload reload [RFC6940]
rtsp Real-time Streaming Protocol (RTSP) [RFC2326][RFC-ietf-mmusic-rfc2326bis-40]
rtsps Real-time Streaming Protocol (RTSP) over TLS [RFC2326][RFC-ietf-mmusic-rfc2326bis-40]
rtspu Real-time Streaming Protocol (RTSP) over unreliable datagram transport [RFC2326]
service service location [RFC2609]
session session [RFC6787]
shttp Secure Hypertext Transfer Protocol [RFC2660]
sieve ManageSieve Protocol [RFC5804]
sip session initiation protocol [RFC3261]
sips secure session initiation protocol [RFC3261]
sms Short Message Service [RFC5724]
snmp Simple Network Management Protocol [RFC4088]
soap.beep soap.beep [RFC4227]
soap.beeps soap.beeps [RFC4227]
stun stun [RFC7064]
stuns stuns [RFC7064]
tag tag [RFC4151]
tel telephone [RFC3966]
telnet Reference to interactive sessions [RFC4248]
tftp Trivial File Transfer Protocol [RFC3617]
thismessage perm/thismessage multipart/related relative reference resolution [RFC2557]
tn3270 Interactive 3270 emulation sessions [RFC6270]
tip Transaction Internet Protocol [RFC2371]
turn turn [RFC7065]
turns turns [RFC7065]
tv TV Broadcasts [RFC2838]
urn Uniform Resource Names [RFC2141][IANA registry urn-namespaces]
vemmi versatile multimedia interface [RFC2122]
ws WebSocket connections [RFC6455]
wss Encrypted WebSocket connections [RFC6455]
xcon xcon [RFC6501]
xcon-userid xcon-userid [RFC6501]
xmlrpc.beep xmlrpc.beep [RFC3529]
xmlrpc.beeps xmlrpc.beeps [RFC3529]
xmpp Extensible Messaging and Presence Protocol [RFC5122]
z39.50r Z39.50 Retrieval [RFC2056]
z39.50s Z39.50 Session [RFC2056]

Provisional URI Schemes

Available Formats

URI Scheme Template Description Reference
acr prov/acr acr [OMA-OMNA]
adiumxtra prov/adiumxtra adiumxtra [Dave_Thaler]
afp prov/afp afp [Dave_Thaler]
afs Andrew File System global file names [RFC1738]
aim prov/aim aim [Dave_Thaler]
apt prov/apt apt [Dave_Thaler]
attachment prov/attachment attachment [Dave_Thaler]
aw prov/aw aw [Dave_Thaler]
barion prov/barion barion [Bíró_Tamás]
beshare prov/beshare beshare [Dave_Thaler]
bitcoin prov/bitcoin bitcoin [Dave_Thaler]
bolo prov/bolo bolo [Dave_Thaler]
callto prov/callto callto [Alexey_Melnikov]
chrome prov/chrome chrome [Dave_Thaler]
chrome-extension prov/chrome-extension chrome-extension [Dave_Thaler]
com-eventbrite-attendee prov/com-eventbrite-attendee com-eventbrite-attendee [Bob_Van_Zant]
content prov/content content [Dave_Thaler]
cvs prov/cvs cvs [Dave_Thaler]
dlna-playsingle prov/dlna-playsingle dlna-playsingle [DLNA]
dlna-playcontainer prov/dlna-playcontainer dlna-playcontainer [DLNA]
dtn DTNRG research and development [RFC5050]
dvb dvb [draft-mcroberts-uri-dvb]
ed2k prov/ed2k ed2k [Dave_Thaler]
facetime prov/facetime facetime [Dave_Thaler]
feed prov/feed feed [Dave_Thaler]
feedready prov/feedready feedready [Mirko_Nosenzo]
finger prov/finger finger [Dave_Thaler]
fish prov/fish fish [Dave_Thaler]
gg prov/gg gg [Dave_Thaler]
git prov/git git [Dave_Thaler]
gizmoproject prov/gizmoproject gizmoproject [Dave_Thaler]
gtalk prov/gtalk gtalk [Dave_Thaler]
ham ham [RFC7046]
hcp prov/hcp hcp [Alexey_Melnikov]
icon icon [draft-lafayette-icon-uri-scheme]
ipn ipn [RFC6260]
irc prov/irc irc [Dave_Thaler]
irc6 prov/irc6 irc6 [Dave_Thaler]
ircs prov/ircs ircs [Dave_Thaler]
itms prov/itms itms [Dave_Thaler]
jar prov/jar jar [Dave_Thaler]
jms Java Message Service [RFC6167]
keyparc prov/keyparc keyparc [Dave_Thaler]
lastfm prov/lastfm lastfm [Dave_Thaler]
ldaps prov/ldaps ldaps [Dave_Thaler]
magnet prov/magnet magnet [Dave_Thaler]
maps prov/maps maps [Dave_Thaler]
market prov/market market [Dave_Thaler]
message prov/message message [Dave_Thaler]
mms prov/mms mms [Alexey_Melnikov]
ms-help prov/ms-help ms-help [Alexey_Melnikov]
ms-settings-power prov/ms-settings-power ms-settings-power [urischemeowners_at_microsoft.com]
msnim prov/msnim msnim [Alexey_Melnikov]
mumble prov/mumble mumble [Dave_Thaler]
mvn prov/mvn mvn [Dave_Thaler]
notes prov/notes notes [Dave_Thaler]
oid prov/oid oid [draft-larmouth-oid-iri]
palm prov/palm palm [Dave_Thaler]
paparazzi prov/paparazzi paparazzi [Dave_Thaler]
platform prov/platform platform [Dave_Thaler]
proxy prov/proxy proxy [Dave_Thaler]
psyc prov/psyc psyc [Dave_Thaler]
query prov/query query [Dave_Thaler]
res prov/res res [Alexey_Melnikov]
resource prov/resource resource [Dave_Thaler]
rmi prov/rmi rmi [Dave_Thaler]
rsync rsync [RFC5781]
rtmfp prov/rtmfp rtmfp [RFC7425]
rtmp prov/rtmp rtmp [Dave_Thaler]
secondlife prov/secondlife query [Dave_Thaler]
sftp prov/sftp query [Dave_Thaler]
sgn prov/sgn sgn [Dave_Thaler]
skype prov/skype skype [Alexey_Melnikov]
smb prov/smb smb [Dave_Thaler]
smtp prov/smtp smtp [draft-melnikov-smime-msa-to-mda]
soldat prov/soldat soldat [Dave_Thaler]
spotify prov/spotify spotify [Dave_Thaler]
ssh prov/ssh ssh [Dave_Thaler]
steam prov/steam steam [Dave_Thaler]
submit prov/submit submit [draft-melnikov-smime-msa-to-mda]
svn prov/svn svn [Dave_Thaler]
teamspeak prov/teamspeak teamspeak [Dave_Thaler]
teliaeid prov/teliaeid teliaeid [Peter_Lewandowski]
things prov/things things [Dave_Thaler]
udp prov/udp udp [Dave_Thaler]
unreal prov/unreal unreal [Dave_Thaler]
ut2004 prov/ut2004 ut2004 [Dave_Thaler]
ventrilo prov/ventrilo ventrilo [Dave_Thaler]
view-source prov/view-source view-source [Mykyta_Yevstifeyev]
webcal prov/webcal webcal [Dave_Thaler]
wtai prov/wtai wtai [Dave_Thaler]
wyciwyg prov/wyciwyg wyciwyg [Dave_Thaler]
xfire prov/xfire xfire [Dave_Thaler]
xri prov/xri xri [Dave_Thaler]
ymsgr prov/ymsgr ymsgr [Dave_Thaler]

Historical URI Schemes

Available Formats

URI Scheme Template Description Reference
fax fax [RFC2806][RFC3966]
mailserver Access to data available from mail servers [RFC6196]
modem modem [RFC2806][RFC3966]
pack historic/pack pack [draft-shur-pack-uri-scheme]
prospero Prospero Directory Service [RFC4157]
snews NNTP over SSL/TLS [RFC5538]
videotex historic/videotex videotex [draft-mavrakis-videotex-url-spec][RFC2122][RFC3986]
wais Wide Area Information Servers [RFC4156]
z39.50 Z39.50 information access [RFC1738][RFC2056]


ID Name Contact URI Last Updated
[Alexey_Melnikov] Alexey Melnikov mailto:alexey.melnikov&isode.com 2012-09-12
[Bíró_Tamás] Bíró Tamás mailto:tamas.biro&sensenet.com 2014-05-16
[Bob_Van_Zant] Bob Van Zant mailto:bob&veznat.com 2011-11-14
[Dave_Thaler] Dave Thaler mailto:dthaler&microsoft.com 2012-09-23
[DLNA] DLNA mailto:admin&dlna.org 2012-01-04
[Mirko_Nosenzo] Mirko Nosenzo mailto:mirko.n&incomedia.eu 2013-09-20
[Mykyta_Yevstifeyev] Mykyta Yevstifeyev mailto:evnikita2&gmail.com 2011-05-25
[OMA-OMNA] OMNA – Open Mobile Naming Authority of the Open Mobile Alliance mailto:OMA-OMNA&mail.openmobilealliance.org 2014-12-19
[Peter_Lewandowski] Peter Lewandowski mailto:peter.lewandowski&cygate.se 2014-09-12
[Peter_Saint-Andre] Peter Saint-Andre mailto:stpeter&jabber.org 2012-12-04
[urischemeowners_at_microsoft.com] urischemeowners at microsoft.com mailto:urischemeowners&microsoft.com 2013-06-13