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Uniform Resource Identifier (URI) Schemes

Uniform Resource Identifier (URI) Schemes

Last Updated
Available Formats



Plain text

Registry included below

Uniform Resource Identifier (URI) Schemes

Graham Klyne
[RFC7595][RFC Errata 4420][RFC8615]
Requests for permanent registration must be preceded by mailing list review, 
per Section 7.2 of [RFC7595].
Schemes for which the primary reference is an Internet-Draft are generally 
considered to be provisional until the I-D is approved by the IETF for RFC 
publication, even when the specification requests permanent registration.
Available Formats

Range Registration Procedures
Permanent Expert Review
Provisional First Come First Served
Historical Expert Review
URI Scheme Template Description Status Well-Known URI Support Reference Notes
aaa Diameter Protocol Permanent - [RFC6733]
aaas Diameter Protocol with Secure Transport Permanent - [RFC6733]
about about Permanent - [RFC6694]
acap application configuration access protocol Permanent - [RFC2244]
acct acct Permanent - [RFC7565]
acd prov/acd acd Provisional - [Michael_Hedenus]
acr prov/acr acr Provisional - [OMA-OMNA]
adiumxtra prov/adiumxtra adiumxtra Provisional - [Dave_Thaler]
adt prov/adt adt Provisional - [SAP_SE]
afp prov/afp afp Provisional - [Dave_Thaler]
afs Andrew File System global file names Provisional - [RFC1738]
aim prov/aim aim Provisional - [Dave_Thaler]
amss prov/amss amss Provisional - [RadioDNS_Project]
android prov/android android Provisional - [Adam_Barth][]
appdata prov/appdata appdata Provisional - []
apt prov/apt apt Provisional - [Dave_Thaler]
ar prov/ar ar Provisional - [Arweave_Team]
ark prov/ark ark Provisional - [ARK_agency][]
attachment prov/attachment attachment Provisional - [Dave_Thaler]
aw prov/aw aw Provisional - [Dave_Thaler]
barion prov/barion barion Provisional - [Bíró_Tamás]
beshare prov/beshare beshare Provisional - [Dave_Thaler]
bitcoin prov/bitcoin bitcoin Provisional - [Dave_Thaler]
bitcoincash prov/bitcoincash bitcoincash Provisional - [Corentin_Mercier]
blob prov/blob blob Provisional - [W3C_WebApps_Working_Group][Chris_Rebert]
bolo prov/bolo bolo Provisional - [Dave_Thaler]
browserext prov/browserext browserext Provisional - [Mike_Pietraszak]
cabal prov/cabal cabal Provisional - [Frédéric_Wang][Cabal_Club]
calculator prov/calculator calculator Provisional - []
callto prov/callto callto Provisional - [Alexey_Melnikov]
cap Calendar Access Protocol Permanent - [RFC4324]
cast prov/cast cast Provisional - [Adam_Barth][]
casts prov/casts casts Provisional - [Adam_Barth][]
chrome prov/chrome chrome Provisional - [Dave_Thaler]
chrome-extension prov/chrome-extension chrome-extension Provisional - [Dave_Thaler]
cid content identifier Permanent - [RFC2392]
coap coap Permanent [RFC7252] [RFC7252]
coap+tcp coap+tcp [1] Permanent [RFC8323] [RFC8323]
coap+ws coap+ws [1] Permanent [RFC8323] [RFC8323]
coaps coaps Permanent [RFC7252] [RFC7252]
coaps+tcp coaps+tcp [1] Permanent [RFC8323] [RFC8323]
coaps+ws coaps+ws [1] Permanent [RFC8323] [RFC8323]
com-eventbrite-attendee prov/com-eventbrite-attendee com-eventbrite-attendee Provisional - [Bob_Van_Zant]
content prov/content content Provisional - [Dave_Thaler]
content-type prov/content-type content-type Provisional - [Donald_Eastlake]
conti prov/conti conti Provisional - [Michael_Hedenus]
crid TV-Anytime Content Reference Identifier Permanent - [RFC4078]
cvs prov/cvs cvs Provisional - [Dave_Thaler]
dab prov/dab dab Provisional - [RadioDNS_Project]
dat prov/dat dat Provisional - [Frédéric_Wang][Paul_Frazee]
data data Permanent - [RFC2397]
dav dav Permanent - [RFC4918]
diaspora prov/diaspora diaspora Provisional - [Dennis_Schubert]
dict dictionary service protocol Permanent - [RFC2229]
did prov/did did Provisional - [W3C_Decentralized_Identifier_Working_Group ][Manu_Sporny][Ivan_Herman]
dis prov/dis dis Provisional - [Christophe_Meessen]
dlna-playcontainer prov/dlna-playcontainer dlna-playcontainer Provisional - [DLNA]
dlna-playsingle prov/dlna-playsingle dlna-playsingle Provisional - [DLNA]
dns Domain Name System Permanent - [RFC4501]
dntp prov/dntp dntp Provisional - [Hans-Dieter_A._Hiep]
doi prov/doi doi Provisional - [Frédéric_Wang][International_DOI_Foundation]
dpp prov/dpp dpp Provisional - [Gaurav_Jain][Wi-Fi_Alliance]
drm prov/drm drm Provisional - [RadioDNS_Project]
drop prov/drop drop Provisional - [Tim_McSweeney]
dtmi prov/dtmi dtmi Provisional - []
dtn DTNRG research and development Permanent - [RFC-ietf-dtn-bpbis-31]
dvb dvb Provisional - [draft-mcroberts-uri-dvb]
dvx prov/dvx dvx Provisional - [Clemens_Bastian]
dweb prov/dweb dweb Provisional - [Frédéric_Wang][Protocol_Labs]
ed2k prov/ed2k ed2k Provisional - [Dave_Thaler]
elsi prov/elsi elsi Provisional - [Kimmo_Lindholm]
embedded prov/embedded embedded Provisional - [Peter_Hoddie]
ens prov/ens ens Provisional - [Ricky_Bloomfield][Bradley_Nelson]
ethereum prov/ethereum ethereum Provisional - [Frédéric_Wang][ligi]
example example Permanent - [RFC7595]
facetime prov/facetime facetime Provisional - [Dave_Thaler]
fax fax Historical - [RFC2806][RFC3966]
feed prov/feed feed Provisional - [Dave_Thaler]
feedready prov/feedready feedready Provisional - [Mirko_Nosenzo]
fido prov/fido fido Provisional - [Adam_Langley]
file Host-specific file names Permanent - [RFC8089]
filesystem historic/filesystem filesystem Historical - [W3C_WebApps_Working_Group][Chris_Rebert]
finger prov/finger finger Provisional - [Dave_Thaler]
first-run-pen-experience prov/first-run-pen-experience first-run-pen-experience Provisional - []
fish prov/fish fish Provisional - [Dave_Thaler]
fm prov/fm fm Provisional - [RadioDNS_Project]
ftp File Transfer Protocol Permanent - [RFC1738]
fuchsia-pkg prov/fuchsia-pkg fuchsia-pkg Provisional - [Adam_Barth][]
geo Geographic Locations Permanent - [RFC5870]
gg prov/gg gg Provisional - [Dave_Thaler]
git prov/git git Provisional - [Dave_Thaler]
gizmoproject prov/gizmoproject gizmoproject Provisional - [Dave_Thaler]
go go Permanent - [RFC3368]
gopher The Gopher Protocol Permanent - [RFC4266]
graph prov/graph graph Provisional - [Alastair_Green]
gtalk prov/gtalk gtalk Provisional - [Dave_Thaler]
h323 H.323 Permanent - [RFC3508]
ham ham Provisional - [RFC7046]
hcap prov/hcap hcap Provisional - []
hcp prov/hcp hcp Provisional - [Alexey_Melnikov]
http Hypertext Transfer Protocol Permanent [RFC8615] [RFC7230, Section 2.7.1]
https Hypertext Transfer Protocol Secure Permanent [RFC8615] [RFC7230, Section 2.7.2]
hxxp prov/hxxp hxxp Provisional - [draft-salgado-hxxp]
hxxps prov/hxxps hxxps Provisional - [draft-salgado-hxxp]
hydrazone prov/hydrazone hydrazone Provisional - [Matthias_Merkel][]
hyper prov/hyper hyper Provisional - [Frédéric_Wang][Paul_Frazee]
iax Inter-Asterisk eXchange Version 2 Permanent - [RFC5456]
icap Internet Content Adaptation Protocol Permanent - [RFC3507]
icon icon Provisional - [draft-lafayette-icon-uri-scheme]
im Instant Messaging Permanent - [RFC3860]
imap internet message access protocol Permanent - [RFC5092]
info Information Assets with Identifiers in Public Namespaces. [RFC4452] (section 3) defines an "info" registry of public namespaces, which is maintained by NISO and can be accessed from []. Permanent - [RFC4452]
iotdisco prov/iotdisco iotdisco Provisional - [Peter_Waher][]
ipfs prov/ipfs ipfs Provisional - [Frédéric_Wang][Protocol_Labs]
ipn ipn Permanent - [RFC-ietf-dtn-bpbis-31]
ipns prov/ipns ipns Provisional - [Frédéric_Wang][Protocol_Labs]
ipp Internet Printing Protocol Permanent - [RFC3510]
ipps Internet Printing Protocol over HTTPS Permanent - [RFC7472]
irc prov/irc irc Provisional - [Dave_Thaler]
irc6 prov/irc6 irc6 Provisional - [Dave_Thaler]
ircs prov/ircs ircs Provisional - [Dave_Thaler]
iris Internet Registry Information Service Permanent - [RFC3981]
iris.beep iris.beep Permanent - [RFC3983]
iris.lwz iris.lwz Permanent - [RFC4993]
iris.xpc iris.xpc Permanent - [RFC4992]
iris.xpcs iris.xpcs Permanent - [RFC4992]
isostore prov/isostore isostore Provisional - []
itms prov/itms itms Provisional - [Dave_Thaler]
jabber perm/jabber jabber Permanent - [Peter_Saint-Andre]
jar prov/jar jar Provisional - [Dave_Thaler]
jms Java Message Service Provisional - [RFC6167]
keyparc prov/keyparc keyparc Provisional - [Dave_Thaler]
lastfm prov/lastfm lastfm Provisional - [Dave_Thaler]
lbry prov/lbry lbry Provisional - [Alex_Grintsvayg]
ldap Lightweight Directory Access Protocol Permanent - [RFC4516]
ldaps prov/ldaps ldaps Provisional - [Dave_Thaler]
leaptofrogans leaptofrogans Permanent - [RFC8589]
lorawan prov/lorawan lorawan Provisional - [OMA-DMSE]
lvlt prov/lvlt lvlt Provisional - [Alexander_Shishenko]
magnet prov/magnet magnet Provisional - [Dave_Thaler]
mailserver Access to data available from mail servers Historical - [RFC6196]
mailto Electronic mail address Permanent - [RFC6068]
maps prov/maps maps Provisional - [Dave_Thaler]
market prov/market market Provisional - [Dave_Thaler]
matrix prov/matrix matrix Provisional - [Hubert_Chathi]
message prov/message message Provisional - [Dave_Thaler] prov/ Provisional - [] prov/ Provisional - [] prov/ Provisional - []
mid message identifier Permanent - [RFC2392]
mms prov/mms mms Provisional - [Alexey_Melnikov]
modem modem Historical - [RFC2806][RFC3966]
mongodb prov/mongodb mongodb Provisional - [Ignacio_Losiggio][Mongo_DB_Inc]
moz prov/moz moz Provisional - [Joe_Hildebrand]
ms-access prov/ms-access ms-access Provisional - []
ms-browser-extension prov/ms-browser-extension ms-browser-extension Provisional - []
ms-calculator prov/ms-calculator ms-calculator Provisional - []
ms-drive-to prov/ms-drive-to ms-drive-to Provisional - []
ms-enrollment prov/ms-enrollment ms-enrollment Provisional - []
ms-excel prov/ms-excel ms-excel Provisional - []
ms-eyecontrolspeech prov/ms-eyecontrolspeech ms-eyecontrolspeech Provisional - []
ms-gamebarservices prov/ms-gamebarservices ms-gamebarservices Provisional - []
ms-gamingoverlay prov/ms-gamingoverlay ms-gamingoverlay Provisional - []
ms-getoffice prov/ms-getoffice ms-getoffice Provisional - []
ms-help prov/ms-help ms-help Provisional - [Alexey_Melnikov]
ms-infopath prov/ms-infopath ms-infopath Provisional - []
ms-inputapp prov/ms-inputapp ms-inputapp Provisional - []
ms-lockscreencomponent-config prov/ms-lockscreencomponent-config ms-lockscreencomponent-config Provisional - []
ms-media-stream-id prov/ms-media-stream-id ms-media-stream-id Provisional - []
ms-meetnow prov/ms-meetnow ms-meetnow Provisional - []
ms-mixedrealitycapture prov/ms-mixedrealitycapture ms-mixedrealitycapture Provisional - []
ms-mobileplans prov/ms-mobileplans ms-mobileplans Provisional - []
ms-officeapp prov/ms-officeapp ms-officeapp Provisional - []
ms-people prov/ms-people ms-people Provisional - []
ms-project prov/ms-project ms-project Provisional - []
ms-powerpoint prov/ms-powerpoint ms-powerpoint Provisional - []
ms-publisher prov/ms-publisher ms-publisher Provisional - []
ms-restoretabcompanion prov/ms-restoretabcompanion ms-restoretabcompanion Provisional - []
ms-screenclip prov/ms-screenclip ms-screenclip Provisional - []
ms-screensketch prov/ms-screensketch ms-screensketch Provisional - []
ms-search prov/ms-search ms-search Provisional - []
ms-search-repair prov/ms-search-repair ms-search-repair Provisional - []
ms-secondary-screen-controller prov/ms-secondary-screen-controller ms-secondary-screen-controller Provisional - []
ms-secondary-screen-setup prov/ms-secondary-screen-setup ms-secondary-screen-setup Provisional - []
ms-settings prov/ms-settings ms-settings Provisional - []
ms-settings-airplanemode prov/ms-settings-airplanemode ms-settings-airplanemode Provisional - []
ms-settings-bluetooth prov/ms-settings-bluetooth ms-settings-bluetooth Provisional - []
ms-settings-camera prov/ms-settings-camera ms-settings-camera Provisional - []
ms-settings-cellular prov/ms-settings-cellular ms-settings-cellular Provisional - []
ms-settings-cloudstorage prov/ms-settings-cloudstorage ms-settings-cloudstorage Provisional - []
ms-settings-connectabledevices prov/ms-settings-connectabledevices ms-settings-connectabledevices Provisional - []
ms-settings-displays-topology prov/ms-settings-displays-topology ms-settings-displays-topology Provisional - []
ms-settings-emailandaccounts prov/ms-settings-emailandaccounts ms-settings-emailandaccounts Provisional - []
ms-settings-language prov/ms-settings-language ms-settings-language Provisional - []
ms-settings-location prov/ms-settings-location ms-settings-location Provisional - []
ms-settings-lock prov/ms-settings-lock ms-settings-lock Provisional - []
ms-settings-nfctransactions prov/ms-settings-nfctransactions ms-settings-nfctransactions Provisional - []
ms-settings-notifications prov/ms-settings-notifications ms-settings-notifications Provisional - []
ms-settings-power prov/ms-settings-power ms-settings-power Provisional - []
ms-settings-privacy prov/ms-settings-privacy ms-settings-privacy Provisional - []
ms-settings-proximity prov/ms-settings-proximity ms-settings-proximity Provisional - []
ms-settings-screenrotation prov/ms-settings-screenrotation ms-settings-screenrotation Provisional - []
ms-settings-wifi prov/ms-settings-wifi ms-settings-wifi Provisional - []
ms-settings-workplace prov/ms-settings-workplace ms-settings-workplace Provisional - []
ms-spd prov/ms-spd ms-spd Provisional - []
ms-sttoverlay prov/ms-sttoverlay ms-sttoverlay Provisional - []
ms-transit-to prov/ms-transit-to ms-transit-to Provisional - []
ms-useractivityset prov/ms-useractivityset ms-useractivityset Provisional - []
ms-virtualtouchpad prov/ms-virtualtouchpad ms-virtualtouchpad Provisional - []
ms-visio prov/ms-visio ms-visio Provisional - []
ms-walk-to prov/ms-walk-to ms-walk-to Provisional - []
ms-whiteboard prov/ms-whiteboard ms-whiteboard Provisional - []
ms-whiteboard-cmd prov/ms-whiteboard-cmd ms-whiteboard-cmd Provisional - []
ms-word prov/ms-word ms-word Provisional - []
msnim prov/msnim msnim Provisional - [Alexey_Melnikov]
msrp Message Session Relay Protocol Permanent - [RFC4975]
msrps Message Session Relay Protocol Secure Permanent - [RFC4975][RFC8873]
mss prov/mss mss Provisional - [Jarmo_Miettinen]
mt prov/mt Matter protocol Provisional - [Connectivity_Standards_Alliance]
mtqp Message Tracking Query Protocol Permanent - [RFC3887]
mumble prov/mumble mumble Provisional - [Dave_Thaler]
mupdate Mailbox Update (MUPDATE) Protocol Permanent - [RFC3656]
mvn prov/mvn mvn Provisional - [Dave_Thaler]
news USENET news Permanent - [RFC5538]
nfs network file system protocol Permanent - [RFC2224]
ni ni Permanent - [RFC6920]
nih nih Permanent - [RFC6920]
nntp USENET news using NNTP access Permanent - [RFC5538]
notes prov/notes notes Provisional - [Dave_Thaler]
num prov/num Namespace Utility Modules Provisional - [Elliott_Brown][]
ocf prov/ocf ocf Provisional - [Dave_Thaler]
oid prov/oid oid Provisional - [draft-larmouth-oid-iri]
onenote prov/onenote onenote Provisional - []
onenote-cmd prov/onenote-cmd onenote-cmd Provisional - []
opaquelocktoken opaquelocktokent Permanent - [RFC4918]
openpgp4fpr prov/openpgp4fpr openpgp4fpr Provisional - [Wiktor_Kwapisiewicz]
otpauth prov/otpauth otpauth Provisional - [Frédéric_Wang][Thomas_Habets]
pack historic/pack pack Historical - [draft-shur-pack-uri-scheme]
palm prov/palm palm Provisional - [Dave_Thaler]
paparazzi prov/paparazzi paparazzi Provisional - [Dave_Thaler]
payment prov/payment payment Provisional - [Arild_Hegvik][]
payto prov/payto payto Provisional - [RFC8905]
pkcs11 PKCS#11 Permanent - [RFC7512]
platform prov/platform platform Provisional - [Dave_Thaler]
pop Post Office Protocol v3 Permanent - [RFC2384]
pres Presence Permanent - [RFC3859]
prospero Prospero Directory Service Historical - [RFC4157]
proxy prov/proxy proxy Provisional - [Dave_Thaler]
pwid prov/pwid pwid Provisional - [Eld_Zierau]
psyc prov/psyc psyc Provisional - [Dave_Thaler]
pttp prov/pttp pttp Provisional - [Tony_Deng][Tuan_Hoang][Bob_Hinkle][Mark_Chen]
qb prov/qb qb Provisional - [Jan_Pokorny]
query prov/query query Provisional - [Dave_Thaler]
quic-transport prov/quic-transport quic-transport Provisional - [draft-vvv-webtransport-quic]
redis prov/redis redis Provisional - [Chris_Rebert]
rediss prov/rediss rediss Provisional - [Chris_Rebert]
reload reload Permanent - [RFC6940]
res prov/res res Provisional - [Alexey_Melnikov]
resource prov/resource resource Provisional - [Dave_Thaler]
rmi prov/rmi rmi Provisional - [Dave_Thaler]
rsync rsync Provisional - [RFC5781]
rtmfp prov/rtmfp rtmfp Provisional - [RFC7425]
rtmp prov/rtmp rtmp Provisional - [Dave_Thaler]
rtsp Real-Time Streaming Protocol (RTSP) Permanent - [RFC2326][RFC7826]
rtsps Real-Time Streaming Protocol (RTSP) over TLS Permanent - [RFC2326][RFC7826]
rtspu Real-Time Streaming Protocol (RTSP) over unreliable datagram transport Permanent - [RFC2326]
sarif prov/sarif sarif Provisional - [OASIS_Open][Michael_C_Fanning][David_Keaton]
secondlife prov/secondlife query Provisional - [Dave_Thaler]
secret-token prov/secret-token secret-token Provisional - [RFC8959]
service service location Permanent - [RFC2609]
session session Permanent - [RFC6787]
sftp prov/sftp query Provisional - [Dave_Thaler]
sgn prov/sgn sgn Provisional - [Dave_Thaler]
shc prov/shc shc Provisional - [Josh_Mandel]
shttp Secure Hypertext Transfer Protocol Permanent - [RFC2660]
sieve ManageSieve Protocol Permanent - [RFC5804]
simpleledger prov/simpleledger simpleledger Provisional - [James_Cramer]
sip session initiation protocol Permanent - [RFC3261]
sips secure session initiation protocol Permanent - [RFC3261]
skype prov/skype skype Provisional - [Alexey_Melnikov]
smb prov/smb smb Provisional - [Dave_Thaler]
sms Short Message Service Permanent - [RFC5724]
smtp prov/smtp smtp Provisional - [draft-melnikov-smime-msa-to-mda]
snews NNTP over SSL/TLS Historical - [RFC5538]
snmp Simple Network Management Protocol Permanent - [RFC4088]
soap.beep soap.beep Permanent - [RFC4227]
soap.beeps soap.beeps Permanent - [RFC4227]
soldat prov/soldat soldat Provisional - [Dave_Thaler]
spiffe prov/spiffe spiffe Provisional - [Evan_Gilman]
spotify prov/spotify spotify Provisional - [Dave_Thaler]
ssb prov/ssb ssb Provisional - [Frédéric_Wang][Secure_Scuttlebutt_Consortium]
ssh prov/ssh ssh Provisional - [Dave_Thaler]
steam prov/steam steam Provisional - [Dave_Thaler]
stun stun Permanent - [RFC7064]
stuns stuns Permanent - [RFC7064]
submit prov/submit submit Provisional - [draft-melnikov-smime-msa-to-mda]
swh prov/swh swh Provisional - [Software_Heritage][Stefano_Zacchiroli]
svn prov/svn svn Provisional - [Dave_Thaler]
tag tag Permanent - [RFC4151]
teamspeak prov/teamspeak teamspeak Provisional - [Dave_Thaler]
tel telephone Permanent - [RFC3966][RFC5341]
teliaeid prov/teliaeid teliaeid Provisional - [Peter_Lewandowski]
telnet Reference to interactive sessions Permanent - [RFC4248]
tftp Trivial File Transfer Protocol Permanent - [RFC3617]
things prov/things things Provisional - [Dave_Thaler]
thismessage perm/thismessage multipart/related relative reference resolution Permanent - [RFC2557]
tip Transaction Internet Protocol Permanent - [RFC2371]
tn3270 Interactive 3270 emulation sessions Permanent - [RFC6270]
tool prov/tool tool Provisional - [Matthias_Merkel]
turn turn Permanent - [RFC7065]
turns turns Permanent - [RFC7065]
tv TV Broadcasts Permanent - [RFC2838]
udp prov/udp udp Provisional - [Dave_Thaler]
unreal prov/unreal unreal Provisional - [Dave_Thaler]
upt prov/upt upt Provisional - [Tim_McSweeney]
urn Uniform Resource Names Permanent - [RFC8141][IANA registry urn-namespaces]
ut2004 prov/ut2004 ut2004 Provisional - [Dave_Thaler]
v-event prov/v-event v-event Provisional - [draft-menderico-v-event-uri]
vemmi versatile multimedia interface Permanent - [RFC2122]
ventrilo prov/ventrilo ventrilo Provisional - [Dave_Thaler]
videotex historic/videotex videotex Historical - [draft-mavrakis-videotex-url-spec][RFC2122][RFC3986]
vnc Remote Framebuffer Protocol Permanent - [RFC7869]
view-source prov/view-source view-source Provisional - [Mykyta_Yevstifeyev]
vscode prov/vscode vscode Provisional - []
vscode-insiders prov/vscode-insiders vscode-insiders Provisional - []
vsls prov/vsls vsls Provisional - []
wais Wide Area Information Servers Historical - [RFC4156]
wcr prov/wcr wcr Provisional - [Jason_Dzubak]
webcal prov/webcal webcal Provisional - [Dave_Thaler]
wifi prov/wifi wifi Provisional - [Wi-Fi_Alliance][Jun_Tian]
wpid prov/wpid wpid Historical - [Eld_Zierau]
ws WebSocket connections Permanent [RFC8307] [RFC6455]
wss Encrypted WebSocket connections Permanent [RFC8307] [RFC6455]
wtai prov/wtai wtai Provisional - [Dave_Thaler]
wyciwyg prov/wyciwyg wyciwyg Provisional - [Dave_Thaler]
xcon xcon Permanent - [RFC6501]
xcon-userid xcon-userid Permanent - [RFC6501]
xfire prov/xfire xfire Provisional - [Dave_Thaler]
xmlrpc.beep xmlrpc.beep Permanent - [RFC3529]
xmlrpc.beeps xmlrpc.beeps Permanent - [RFC3529]
xmpp Extensible Messaging and Presence Protocol Permanent - [RFC5122]
xri prov/xri xri Provisional - [Dave_Thaler]
ymsgr prov/ymsgr ymsgr Provisional - [Dave_Thaler]
z39.50 Z39.50 information access Historical - [RFC1738][RFC2056]
z39.50r Z39.50 Retrieval Permanent - [RFC2056]
z39.50s Z39.50 Session Permanent - [RFC2056]

Contact Information

ID Name Organization Contact URI Last Updated
[Adam_Barth] Adam Barth mailto:abarth& 2019-03-29
[Adam_Langley] Adam Langley mailto:agl& 2021-09-03
[Alastair_Green] Alastair Green 2017-05-19
[Alex_Grintsvayg] Alex Grintsvayg mailto:grin& 2020-06-16
[Alexey_Melnikov] Alexey Melnikov mailto:alexey.melnikov& 2012-09-12
[Alexander_Shishenko] Alexander Shishenko mailto:alex& 2016-06-13
[Arild_Hegvik] Arild Hegvik mailto:arild& 2020-01-08
[ARK_agency] ARK Maintenance Agency 2019-08-22
[Arweave_Team] Arweave Team mailto:sam& 2021-08-23
[Bíró_Tamás] Bíró Tamás mailto:tamas.biro& 2014-05-16
[Bob_Hinkle] Bob Hinkle mailto:bohinkle& 2019-06-24
[Bob_Van_Zant] Bob Van Zant mailto:bob& 2011-11-14
[Bradley_Nelson] Bradley Nelson mailto:bradnelson& 2020-08-28
[Cabal_Club] Cabal Club mailto:cabal& 2020-05-14
[Chris_Rebert] Chris Rebert mailto:iana.url.schemes& 2015-07-21
[Christophe_Meessen] Christophe Meessen mailto:uri-review& 2015-12-08
[Clemens_Bastian] Clemens Bastian mailto:clemens.bastian& 2021-07-21
[Connectivity_Standards_Alliance] Connectivity Standards Alliance 2021-05-17
[Corentin_Mercier] Corentin Mercier mailto:corentin& 2018-08-13
[Dave_Thaler] Dave Thaler mailto:dthaler& 2016-08-05
[David_Keaton] David Keaton mailto:dmk& 2021-03-19
[Dennis_Schubert] Dennis Schubert mailto:mail& 2017-09-13
[DLNA] DLNA mailto:admin& 2012-01-04
[Hans-Dieter_A._Hiep] Hans-Dieter A. Hiep mailto:info& 2015-08-05
[Donald_Eastlake] Donald Eastlake mailto:d3e3e3& 2021-07-01
[Eld_Zierau] Eld Zierau mailto:elzi& 2016-12-01
[Frédéric_Wang] Frédéric Wang mailto:fwang& 2020-05-14
[Elliott_Brown] Elliott Brown mailto:elliott.brown& 2020-09-07
[Evan_Gilman] Evan Gilman mailto:evan& 2018-02-23
[Gaurav_Jain] Gaurav Jain mailto:gjain& 2019-01-23
[Hubert_Chathi] Hubert Chathi mailto:hubertc& 2020-07-24
[Ignacio_Losiggio] Ignacio Losiggio mailto:iglosiggio& 2017-05-09
[International_DOI_Foundation] International DOI Foundation mailto:contact& 2020-05-14
[Ivan_Herman] Ivan Herman mailto:ivan& 2020-02-14
[James_Cramer] James Cramer mailto:jcramer& 2018-07-27
[Jan_Pokorny] Jan Pokorny mailto:jpokorny& 2016-09-20
[Jarmo_Miettinen] Jarmo_Miettinen mailto:jarmo.miettinen& 2019-02-12
[Jason_Dzubak] Jason Dzubak mailto:dzubak& 2020-12-10
[Joe_Hildebrand] Joe Hildebrand mailto:jhildebrand& 2017-01-20
[Josh_Mandel] Josh Mandel mailto:Joshua.Mandel& 2021-05-11
[Jun_Tian] Jun Tian mailto:jtian& 2020-08-26
[Kimmo_Lindholm] Kimmo Lindholm mailto:kimmo.lindholm& 2018-06-06
[ligi] ligi mailto:ligi& 2020-05-15
[Manu_Sporny] Manu Sporny mailto:msporny& 2020-02-14
[Mark_Chen] Mark Chen mailto:marchen& 2019-06-24
[Matthias_Merkel] Matthias Merkel mailto:moritz30& 2017-03-14
[Michael_C_Fanning] Michael C. Fanning mailto:mikefan& 2021-03-19
[Michael_Hedenus] Michael Hedenus mailto:michael.hedenus& 2017-10-20
[Mike_Pietraszak] Mike Pietraszak mailto:mikepie& 2016-10-17
[Mirko_Nosenzo] Mirko Nosenzo mailto:mirko.n& 2013-09-20
[Mongo_DB_Inc] Mongo DB, Inc 2017-05-09
[Mykyta_Yevstifeyev] Mykyta Yevstifeyev mailto:evnikita2& 2011-05-25
[OASIS_Open] OASIS Open 2021-03-19
[OCF_CoreTech_WG] Open Connectivity Foundation (OCF) CoreTech WG mailto:coretech_wg& 2017-06-07
[OMA-DMSE] OMA-DMSE – Device Management Working Group at the Open Mobile Alliance mailto:OMA-DM& 2019-04-16
[OMA-OMNA] OMNA – Open Mobile Naming Authority of the Open Mobile Alliance mailto:OMA-OMNA& 2014-12-19
[Paul_Frazee] Paul Frazee mailto:pfrazee& 2020-05-14
[Peter_Hoddie] Peter Hoddie mailto:peter& 2021-02-19
[Peter_Lewandowski] Peter Lewandowski mailto:peter.lewandowski& 2014-09-12
[Peter_Saint-Andre] Peter Saint-Andre mailto:stpeter& 2012-12-04
[Peter_Waher] Peter Waher mailto:peterwaher& 2015-11-25
[Protocol_Labs] Protocol Labs mailto:jbenet& 2020-05-14
[RadioDNS_Project] RadioDNS Project mailto:iana& 2019-03-18
[Ricky_Bloomfield] Ricky Bloomfield mailto:rickybloomfield& 2020-08-28
[SAP_SE] SAP SE mailto:ma.becker& 2019-07-04
[Secure_Scuttlebutt_Consortium] Secure Scuttlebutt Consortium mailto:christianbundy& 2020-05-15
[Software_Heritage] Software Heritage 2020-04-28
[Stefano_Zacchiroli] Stefano Zacchiroli mailto:zack& 2020-04-28
[Thomas_Habets] Thomas Habets mailto:thomas& 2020-05-14
[Tim_McSweeney] Tim McSweeney mailto:tim& 2020-07-28
[Tony_Deng] Tony Deng mailto:tdeng& 2019-06-24
[Tuan_Hoang] Tuan Hoang mailto:tuhoang& 2019-06-24
[] urischemeowners at mailto:urischemeowners& 2021-09-09
[W3C_WebApps_Working_Group] W3C WebApps Working Group mailto:public-webapps& 2015-07-17
[W3C_Decentralized_Identifier_Working_Group] W3C Decentralized Identifier Working Group mailto:public-did-wg& 2020-02-14
[Wiktor_Kwapisiewicz] Wiktor Kwapisiewicz mailto:wiktor& 2018-05-31
[Wi-Fi_Alliance] Wi-Fi Alliance mailto:technical& 2020-08-26


CoAP registers different URI schemes for accessing CoAP resources 
via different protocols. This approach runs counter to the WWW principle that a 
URI identifies a resource and that multiple URIs for identifying the same 
resource should be avoided [].