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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 It is up to the individual countries whether to use this classification system, and whether a given organization qualifies as a school.

.sch (file extension)

The .sch file extension indicates a circuit schematic file that can be opened by:

  • EAGLE (proprietary)
  • KiCAD (open source)
  • Express PCB (free)