localhost: reserved to avoid conflict with the traditional use of localhost as a hostname test: reserved for use in tests RFC 6762 reserves the use of .local for link-local host names that can be resolved via the Multicast DNS name resolution protocol. RFC 7686 reserves the use of .onion for the self-authenticating names of Tor onion services. These names can only be resolved by a Tor client because of the use of onion routing to protect the anonymity of users. Internet-Draft draft-wkumari-dnsop-internal-00 proposes reserving the use of .internal for "names which do not have meaning in the global context but do have meaning in a context internal to their network", and for which the RFC 6761 reserved names are semantically inappropriate. Historical domains In the late 1980s, InterNIC created the nato domain for use by NATO. NATO considered none of the then-existing TLDs as adequately reflecting their status as an international organization. Soon after this addition, however, InterNIC also created the int TLD for the use by international organizations in general, and persuaded NATO to use the second level domain nato.int instead. The nato TLD, no longer used, was finally removed in July 1996. Other historical TLDs are cs for Czechoslovakia (now using cz for Czech Republic and sk for Slovakia), dd for East Germany (using de after reunification of Germany), yu for SFR Yugoslavia and Serbia and Montenegro (now using ba for Bosnia and Herzegovina, hr for Croatia, me for Montenegro, mk for North Macedonia, rs for Serbia and si for Slovenia), and zr for Zaire (now cd for the Democratic Republic of the Congo). In contrast to these, the TLD su has remained active despite the demise of the Soviet Union that it represents. Under the chairmanship of Nigel Roberts, ICANN's ccNSO is working on a policy for retirement of ccTLDs that have been removed from ISO 3166. Proposed domains Around late 2000, ICANN discussed and finally introduced aero, biz, coop, info, museum, name, and pro TLDs. Site owners argued that a similar TLD should be made available for adult and pornographic websites to settle the dispute of obscene content on the Internet, to address the responsibility of US service providers under the US Communications Decency Act of 1996. Several options were proposed including xxx, sex and adult. The xxx top-level domain eventually went live in 2011. An older proposal consisted of seven new gTLDs: arts, firm, info,