(top)
                  uk    United Kingdom
            ac.         Academic
            co.         Commercial
            gov.        Governmental
      royal.            Royal Family
            ltd.        Limited companies
            mod.        Ministry of Defence
            net.        Internet Service Providers
            nhs.        National Health Service Organisations
            nic.        Network Information Centre
            org.        Organisations
            plc.        Public Limited Companies
            police.     Police Forces
            sch.        Schools