Single-letter second-level domain


Single-letter second-level domains are domains in which the second-level domain of the domain name consists of only one letter, such as. In 1993, the Internet Assigned Numbers Authority explicitly reserved all single-letter and single-digit second-level domains under the top-level domains com, net, and org, and grandfathered those that had already been assigned. In December 2005, ICANN considered auctioning these domain names.

Active single-letter domains

On December 1, 1993, the Internet Assigned Numbers Authority explicitly reserved the remaining single-letter and single-digit domain names. The few domains that were already assigned were grandfathered in and continued to exist.
The six single-letter domains in existence at that time under.com,.net and.org were the following:
Domain name1993 ownerCurrent owner
i.netINet Solutions LtdSaw.com
q.comJGLumen Technologies
q.netPrivately ownedPrivately owned
x.comMarcel DePaolis & Dave WeinsteinX Corp.
x.orgX ConsortiumX.Org Foundation
z.comHomePage.comGMO Internet, Inc.

The.org TLD was subsequently reopened for single-letter domain registrations. These and selected other gTLD and ccTLD single-letter domain names currently in use, typically as shortcuts, are listed below.
Domain nameCurrent userUsage-
0.emailZero Email-
a.coAmazon.comURL shortcut for Amazon, generally used by Amazon in SMS messages for informing purchasers of activity on an order-
a.org-
b.mwBMWURL shortcut for BMW-
c.aicharacter.ai-
c.ccBrian CartmellHomepage-
c.imC.IM is a general, mainly English-speaking Mastodon instance.-
c.orgChange.orgURL shortcut for change.org-
d.gsDragonsayenURL shortcut for dragonsayen.com -
d.tubeDTubeVideo sharing platform with peer-to-peer capabilities-
e.ggMeta Platforms-
e.imMailTimeURL shortcut for MailTime Email Messenger-
e.srlE-GroupOfficial URL Of E-Group.-
IT services have been provided by since 2005, operating from Bangladesh, Germany, USA, Australia, France, Italy, Libya, Norway, UK, and Ireland.-
f.orgFinTech Labs-
g.cnGoogleGoogle's official URL shortcut to help Chinese users locate Google-
g.coGoogleGoogle's official URL shortcut-
g.glGoogle-
g.ggGlobal Grid Gallery-
g.networkG.NetworkLondon based ISP-
g.org-
g.vug.vuAn URL Shortener-
h.plusUnstable RealityHomepage for the H+ research project, owned by Alessandro Perilli-
A private email identity from Rocket Domains, part of the suite — inspired by sci-fi, civil rights, and digital freedom.-
k.atk-digital Media GmbH & Co KGAustrian News-portal-
k.imKim DotcomURL shortcut for x.com/kimdotcom -
k.ttCitynews SpAURL shortcut for Citinews-
k.vuFreeDNS-
l.inkTop Level Design-
m.coVolvo CarsVolvo Cars' car sharing service, M-
m.meMeta PlatformsURL shortcut for Messenger-
m.pagemmm.pageURL shortcut for mmm.page website builder-
n.prNPRURL shortcut for public radio network NPR-
n.schoolThe New SchoolWebsite of The New School in Moscow-
o.coOverstock.comURL shortcut for Overstock.com-
q.digitalQ.Digital, Inc.-
r.nfAn instance of the Lemmy social news aggregator software, previously an instance of Libreddit, a private Reddit frontend.-
s.coSnap Inc.URL shortcut to Snapchat's download page-
s.deSparkasseURL shortcut for sparkasse.de-
s.idPT Aidi Digital GlobalURL Shortener-
s.teamSteamQuick friend invites on Steam-
t.coX Corp.Official URL shortcut of Twitter -
t.lyt.lyURL Shortener-
t.meTelegramURL shortcut for Telegram-
u.aeUnited Arab EmiratesThe United Arab Emirates' Government portal-
u.tou.toURL Shortener-
v.gdv.gdURL shortener
v.meVisa Inc.URL shortcut for Visa-
v.orgV Foundation-
w.orgWordPressRedirects to wordpress.org, has some assets for wordpress.org -
w.wikiWikimedia FoundationThe official Wikimedia Foundation URL Shortener-
x.aixAIHomepage URL-
X -
x.companyX DevelopmentHomepage for X Development-
x.teamShortcut to X Careers, a service at X Development-
y.gyURL Shortener and QR Code Creator-
y.orgYMCA of the United StatesShortcut to YMCA-
z.aiZ.AIAI chatbot and coding model-
VPN service-
s.eeURL Shortener-
b.lsURL Shortener-
g.lsURL Shortener-
j.lsURL Shortener-
q.ggURL Shortener-
q.lsURL Shortener-
u.lsURL Shortener-
w.lsURL Shortener-
z.lsURL Shortener-
u.nuURL Shortener-
0.sbURL Shortener-
0.tlURL Shortener-
2.peURL Shortener-
2.sbURL Shortener-
3.sbURL Shortener-
4.sbURL Shortener-
5.stURL Shortener-
6.vuURL Shortener-
7.lsURL Shortener-
8.nfURL Shortener-
9.msURL Shortener-
d.tlURL Shortener-
e.gdURL Shortener-
f.tlURL Shortener-
h.foURL Shortener-
i.vgURL Shortener-
j.gtURL Shortener-
l.gtURL Shortener-
l.nfURL Shortener-
l.tdURL Shortener-
m.boURL Shortener-
n.msURL Shortener-
p.sbURL Shortener-
q.cgURL Shortener-
r.glURL Shortener-
s.sbURL Shortener-
s.ttURL Shortener-
u.nfURL Shortener-
z.nuURL Shortener-
a.acURL Shortener-
a.ttURL Shortener-
b.eeURL Shortener-
b.luURL Shortener-
c.skURL Shortener-
d.acURL Shortener-
f.biURL Shortener-
h.luURL Shortener-
h.skURL Shortener-
k.skURL Shortener-
l.ttURL Shortener-
n.eeURL Shortener-
n.luURL Shortener-
q.luURL Shortener-
t.eeURL Shortener-
t.luURL Shortener-
t.scURL Shortener-
u.scURL Shortener-
u.skURL Shortener-
v.scURL Shortener-
x.shURL Shortener-
z.eeURL Shortener-
z.shURL Shortener-

Many other single-letter second-level domains have been registered under country code top-level domains. The list of country code top-level domains which have been identified to allow single-letter domains are:
  • .ac
  • .af
  • .ag
  • .ai
  • .am
  • .bo
  • .by
  • .bz
  • .cm
  • .cn
  • .co
  • .cr
  • .cx
  • .cz
  • .de
  • .dk
  • .fm
  • .fr
  • .gd
  • .gg
  • .gl
  • .gp
  • .gs
  • .gt
  • .gy
  • .hn
  • .hr
  • .ht
  • .ie
  • .im
  • .io
  • .is
  • .je
  • .kg
  • .ki
  • .kw
  • .la
  • .lb
  • .lc
  • .ly
  • .md
  • .mg
  • .mk
  • .mp
  • .ms
  • .mw
  • .mx
  • .mu
  • .nf
  • .np
  • .nz
  • .pe
  • .ph
  • .pk
  • .pl
  • .pn
  • .pr
  • .pw
  • .ro
  • .sh
  • .st
  • .tc
  • .tl
  • .tt
  • .to
  • .tv
  • .ua
  • .uk
  • .vc
  • .vg
  • .vn
  • .vu
  • .ws