In the domain name system (DNS), .sch is a second-level domain used by several countries, including Iran (.ir), Saudi Arabia (.sa), and the United Kingdom (.uk), as a subdomain to represent primary and secondary schools. In the United Kingdom, these are linked with area names, such that schools have a domain name of the form www...sch.uk. For example, a school in the United Kingdom might have a web address of www.hampshireelementary.hants.sch.uk.