.dd .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 to the root nameservers. Its only use was internally at the universities of Jena and Dresden. With the reunification of Germany, East Germany became
Generic top-level domain an international organization. It was also originally planned to be used for some Internet infrastructure databases, such as ip6.int, the IPv6 equivalent of in-addr.arpa. However, in May 2000, the Internet Architecture Board proposed to exclude infrastructure databases from the int domain. All new databases of this type would be created in arpa (a legacy domain from the conversion of ARPANET), and existing usage would move to arpa wherever feasible, which led to the use of ip6.arpa for IPv6 reverse lookups. By the mid-1990s there was discussion of introduction of more TLDs. Jon Postel, as head of IANA, invited applications from