.dd 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 The ISO 3166-1 code "DD" was withdrawn in 1990. .dd .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: '. 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
Unsponsored top-level domain a reduced set of TLDs: old ones (codice_1, codice_2 and codice_3) and new ones (codice_4, codice_5 and codice_6). Unsponsored top-level domain An unsponsored top-level domain (uTLD) is one of the categories of top-level domains (TLDs) maintained by the Internet Assigned Numbers Authority (IANA) for use in the Domain Name System of the Internet. IANA currently distinguishes 3 groups of top-level domains: country-code top-level domains (ccTLD), generic top-level domains (gTLD) and infrastructure top-level domain. Unsponsored TLD is a specialized top-level domain that has no sponsor, in opposition of sTLD (sponsored), that has a sponsor representing a specific community served by the