.sj is the Internetcountry codetop-level domain (ccTLD) reserved for the designation Svalbard and Jan Mayen. The domain name registry is Norid, but .sj is not open for registration. The issuing of the domain was based on the ISO 3166 designation of Svalbard and Jan Mayen, which consists of two separately administrated integrated territories of Norway: the Arctic archipelago Svalbard and the nearly uninhabited volcanic island Jan Mayen. .sj was designated on 21 August 1997, at the same time as Bouvet Island was allocated .bv. Both were placed under the .no registry Norid, which is also the sponsor. Norwegian policy states that .no is sufficient for those institutions connected to both Svalbard and Jan Mayen, and therefore the domain is not open to registration. It is Norwegian policy not to commercialize domain resources, so there are no plans to sell .sj. Should the domain later come into use, it will be under regulation of the Norwegian Post and Telecommunications Authority and follow the same policy as .no. There are two second-level domains reserved for the two areas: svalbard.no and jan-mayen.no, but other web addresses are also used.
Svalbard and Jan Mayen are two integrated territories of Norway with special status (unincorporated area). The Svalbard Treaty grants Norway full sovereignty of Svalbard, but the archipelago holds special status as among other things a free economic zone and is not part of the European Economic Area and the Schengen Area. Jan Mayen is a nearly unpopulated volcanic island in the Atlantic Ocean and is a fully integrated part of Norway. During the establishment of the ISO 3166 codes, it was proposed that Svalbard have its own code, but the Norwegian authorities chose to also include Jan Mayen in the area. Following the ISO codes, .sj was allocated on 21 August 1997, at the same time .bv was allocated.
The policy for use of .sj is regulated by the Regulation Concerning Domain Names Under Norwegian Country Code Top-level Domains, also known as the Domain Regulation. This regulation also regulates Norway's other two ccTLDs, .bv and .no. Should .sj later come unto use, the same rules and procedures currently regarding .no would be used for .sj. The domain remains reserved for potential future use. Sale of the two unused ccTLDs has not been an item to consider for policymakers, as commercialization of the domain resources is in direct contradiction to Norwegian policy.