. gb is the country code top -level domain ( ccTLD) of the United Kingdom. It exists since July 1985 and is managed by the JANET.

Although GB is the abbreviation according to ISO 3166-1 for the United Kingdom, but even before the existence of the Internet has been used as an abbreviation UK, so that uk could prevail.. The top -level domain. Gb was, however, used only by a few government Web sites and e- mails according to the X.400 standard. After the use of X.400 was virtually ceased, disappeared also the most government sites and the last remaining - at address gb is dra.hmg.gb that belongs to the British Defence Research Agency - but unused. .