Changes

The DNS is composed of a tree-like hierarchy. Each TLD includes many second-level domains (such as "example" in "www.example.com"); each second-level domain can include a number of third-level domains ("www" in "www.example.com"), and so on.

The DNS is composed of a tree-like hierarchy. Each TLD includes many second-level domains (such as "example" in "www.example.com"); each second-level domain can include a number of third-level domains ("www" in "www.example.com"), and so on.

===ccSLDs===

===ccSLDs===

Some countries restrict the second level under their [[ccTLD]]. These countries require that the second-level domain be one of several pre-determined second-level domains, generally indicating what type of individual or organization may register under that SLD. For these countries, you are not permitted to register domain names under the top level domain. It must be registered under one of the pre-determined second-level domains, called a ccSLD, or Country Code Second Level Domain.<ref>[http://www.quackit.com/domain-names/second-level_domain_names.cfm Second-Level Domain Names, quack-it.com]</ref>

Some countries restrict the second level under their [[ccTLD]]. These countries require that the second-level domain be one of several pre-determined second-level domains, generally indicating what type of individual or organization may register under that SLD. For these countries, you are not permitted to register domain names under the top level domain. It must be registered under one of the pre-determined second-level domains, called a ccSLD, or Country Code Second Level Domain.<ref>[http://www.quackit.com/domain-names/second-level_domain_names.cfm Second-Level Domain Names, quack-it.com]</ref>