SLD (Second Level Domain Names)
Second Level Domains (SLDs) are subdivisions of a TLD. These further define an organisations activity within the TLD.

Examples of SLDs governed by Nominet, all belonging to the United Kingdom TLD (.uk) are:

  • co.uk
  • for commercial enterprises (the largest SLD in the UK)
  • me.uk
  • for personal domains
  • org.uk
  • for non-commercial organisations
  • ltd.uk and plc.uk
  • for registered company names only
  • net.uk
  • for Internet Service Providers
  • sch.uk
  • for schools


    These are commonly known as ccSLDs (country code second level domain) ie. the SLD is attributed to a country code TLD.