.dd was the assigned country code top-level domain (ccTLD) for the German Democratic Republic (East Germany). It was chosen based on the ISO 3166-1 alpha-2 code for the German Democratic Republic, the letters coming from the German name of the country, Deutsche Demokratische Republik. In accordance with IANA policy, .dd was therefore available to be assigned as the country code top-level domain (ccTLD) for East Germany. However, this was never done, and so .dd was never added to the root nameservers. Its only use was internally in an isolated network among the universities of Jena and Dresden.^[1]

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.dd

Introduced	Never
TLD type	Country code top-level domain
Status	Not in use
Registry	None
Sponsor	None
Intended use	Entities connected with  East Germany
Actual use	Only internally; unused since German reunification
Registration restrictions	No registrations are now taking place
Structure	Not in root
Dispute policies	None
Registry website	None

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With the reunification of Germany, East Germany became part of the Federal Republic of Germany (West Germany), which had already been assigned the ccTLD .de. The ISO 3166-1 code "DD" was withdrawn in 1990.^[2]