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 The ISO 3166-1 code DD was withdrawn in 1990.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