.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
Single-letter second-level domain .pn .pr .pw .ro .sh .st .tc .tl .tt .to .tv .ua .ws .vc .vg .vn and .vu. Single-character non-ASCII second-level domains also exist (as seen below), also known as Internationalized domain names (IDN), these domains are actually registered as their Punycode translations (which are more than a single character) for DNS purposes. In 2012, the Public Interest Registry (PIR) initiated "Project94", in which 94 one- and two-letter domains in the top-level domain "org", that had been traditionally reserved, are awarded to qualifying organizations. Two-letter second-level domain names under the new generic top-level domains are viewed as a potential source