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.gb is a reserved Internet country code top-level domain (ccTLD) for the United Kingdom. Introduced at the                                                                     .gb
same time as the UK's other top-level domain (.uk), it was never widely used. It is no longer possible to
                                                                                                                                                         Introduced        1985
register under this domain.
                                                                                                                                                         TLD type          Country code top-level
The rule in the Domain Name System is that a top-level domain for a country is derived from the corresponding                                                              domain
two-letter code in the ISO 3166-1 list. Accordingly the correct code for the United Kingdom of Great Britain and
                                                                                                                                                         Status            Unused
Northern Ireland is GB, and the .gb top-level domain was therefore delegated.
                                                                                                                                                         Registry          JANET(UK)
The pre-existing JANET Name Registration Scheme had used "UK" as a country code, so the UK also applied
                                                                                                                                                         Sponsor           JANET(UK)
to Jon Postel of IANA for the .uk TLD. This was granted, and all UK domain names are now issued as .uk,
rather than .gb.                                                                                                                                         Intended use      Entities connected with
                                                                                                                                                                                 United Kingdom
.gb was used for a number of years, mainly by British government organisations and commercial e-mail
                                                                                                                                                         Actual use        Fallen into disuse in favour of
services using X.400-based e-mail infrastructure. This simplified translating between DNS domains and X.400
addresses, which used "GB" as a country code.[1]
                                                                                                                                                         Registration      No registrations presently
With the demise of X.400 e-mail and IANA's general aim of one TLD per country, use of .gb declined; the                                                  restrictions      being taken
domain remains in existence, but it is not open to new subdomain registrations.                                                                          Structure         Government sites formerly
One .gb subdomain still exists in the DNS (as of 2010):     [2] , belonging to Her Majesty's Government's
                                                                                                                                                       found under

former Defence Research Agency, and has three known hostnames remaining: ,[3]                                                          Dispute           None
                                                                                                                                                         policies [4] and . [5]
                                                                                                                                                         Website           None
   1.    ^   Crepin-Leblond,     Olivier M. J. (2003). "International E-mail Accessibility"        . Archived from the original         on 21 May 2008. Retrieved 23 June 2008.
   2.    ^   "DNS lookup for" . 2010. Retrieved 3 July 2010.
   3.    ^   "DNS lookup for" . 2010. Retrieved 3 July 2010.
   4.    ^   "DNS lookup for" . 2010. Retrieved 3 July 2010.
   5.    ^   "DNS lookup for" . 2010. Retrieved 3 July 2010.

External links
      IANA .gb whois information
      JANET(UK) website             Last accessible copy of in the Internet Archive
      Official country code for Britain = GB or UK?                 Email discussion on GB domain (2002) with historical zonefiles.

  V   · T· E·                                                                               Country code top-level domains
                                                                                                         ISO 3166-1

  A .ac .ad .ae .af .ag .ai .al .am .ao .aq .ar .as .at .au .aw .ax .az B .ba .bb .bd .be .bf .bg .bh .bi .bj .bm .bn .bo .br .bs .bt .bw .by .bz C .ca .cc .cd .cf .cg .ch .ci .ck .cl .cm .cn .co .cr
 .cu .cv .cw .cx .cy .cz D .de .dj .dk .dm .do .dz E .ec .ee .eg .er .es .et .eu F .fi .fj .fk .fm .fo .fr G .ga .gd .ge .gf .gg .gh .gi .gl .gm .gn .gp .gq .gr .gs .gt .gu .gw .gy H .hk .hm .hn
 .hr .ht .hu I .id .ie .il .im .in .io .iq .ir .is .it J .je .jm .jo .jp K .ke .kg .kh .ki .km .kn .kp .kr .kw .ky .kz L .la .lb .lc .li .lk .lr .ls .lt .lu .lv .ly M .ma .mc .md .me .mg .mh .mk .ml .mm .mn
  .mo .mp .mq .mr .ms .mt .mu .mv .mw .mx .my .mz N .na .nc .ne .nf .ng .ni .nl .no .np .nr .nu .nz O .om P .pa .pe .pf .pg .ph .pk .pl .pm .pn .pr .ps .pt .pw .py Q .qa R .re .ro .rs
 .ru .rw S .sa .sb .sc .sd .se .sg .sh .si .sk .sl .sm .sn .so .sr .ss .st .sv .sx .sy .sz T .tc .td .tf .tg .th .tj .tk .tl .tm .tn .to .tr .tt .tv .tw .tz U .ua .ug .uk .us .uy .uz V .va .vc .ve .vg .vi .vn
                                                                                      .vu W .wf .ws Y .ye Z .za .zm .zw

                                                                                             Internationalized (IDN) ccTLD

        Cyrillic script:                   Arabic script:                             South Asia (Pakistan,                     East and Southeast Asia:                             Other parts of the World
             .мон (.mon, Mongolia)            . (al-Jazā’ir, Algeria)                 Afghanistan and Iran not included):           .     ( , South Korea)                           and other scripts:
             .қаз (.qaz, Kazakhstan)          . (masr, Egypt)                            . (bangla, Bangladesh)                     .中国 (Zhōngguó, China)                                 .    (ge , Georgia)
             .рф (.rf, Russia)                . (Iran)                                   . (bharat, India)                          .中國 (Zhōngguó, China)
             .срб (.srb, Serbia)              . (al-urdun, Jordan)                       . (bharat, India)                          .香港 (Hong Kong)
             .укр (.ukr, Ukraine)             . (filastin, Palestinian territories)      . (bharat, India)                          .台灣 (Taiwan)
                                              . (pakstan, Pakistan)                      . (bharat, India)
                                                                                                                                    .台湾 (Taiwan)
                                              . (qatar, Qatar)                           . (bharat, India)
                                                                                                                                    . (thai, Thailand)
                                              . (al-saudiah, Saudi Arabia)               . (inthiyaa, India)
                                                                                                                                    .新加坡 (Xīnjiāpō/Sin-ka-po, Singapore)
                                              . (sūryā, Syria)                           . (bharat, India)
                                                                                                                                    . (cinkappūr, Singapore)
                                              . (tunis, Tunisia)                         . (lanka, Sri Lanka)
                                              . (emarat, UAE)                            . (ilangai, Sri Lanka)

                                                                                                    Proposed ccTLDs

                                         .бг (bg, Bulgaria, rejected) .κπ (kp, Cyprus) .ελ (el, Greece, rejected) ‫( .ישראל‬yisrael, Israel) .日本 (nippon, Japan) . (lao, Laos)

          Reserved / unassigned   Allocated / unused                   Being phased out / ISO 3166-1 entry deleted     Retired / deleted

              .bl .bq .eh .mf       .bv .gb .sj .yt                                     .an .su .tp                  .bu .cs .dd .um .yu .zr

                                                       See also Generic top-level domains

via .gb

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