The hierarchy of the domain name system, a domain-level II (abbreviated SLD) is a domain that is directly below a top level domain is located. For example, in example.com the amount of example, the domain level, the latter from the domain level top .com.

domain, the second level is usually the organization that the domain name is a domain name registrar (domain name registrar) registrar has been attributed. Some domain name registrars a hierarchy of second level domain a top level domain have raised that indicate the type of organization that intend to register the second level domain, under it there.