Second-level domains
Domain name registries may also impose a system of second-level domains on users. DENIC, the registry for Germany (.de), does not impose second level domains. AFNIC, the registry for France (.fr), has some second level domains, but not all registrants have to use them, and Nominet UK, the registry for the United Kingdom (.uk), requires all names to have a second level domain (e.g. .co.uk or .org.uk)
Registrants of second-level domains sometimes act as a registry by offering sub-registrations to their registration. For example, registrations to .fami.ly are offered by the registrant of fami.ly and not by GPTC, the registry for Libya
Cost of registration
The cost of domain registration is set by each individual registry.
Article Spource:http://en.wikipedia.org/wiki/Domain_name_registry
Domain name registries may also impose a system of second-level domains on users. DENIC, the registry for Germany (.de), does not impose second level domains. AFNIC, the registry for France (.fr), has some second level domains, but not all registrants have to use them, and Nominet UK, the registry for the United Kingdom (.uk), requires all names to have a second level domain (e.g. .co.uk or .org.uk)
Registrants of second-level domains sometimes act as a registry by offering sub-registrations to their registration. For example, registrations to .fami.ly are offered by the registrant of fami.ly and not by GPTC, the registry for Libya
Cost of registration
The cost of domain registration is set by each individual registry.
Article Spource:http://en.wikipedia.org/wiki/Domain_name_registry