Some domain name registries, often called "network information centers" (NIC), also function as registrars to end-users. The major generic top-level domain registries, such as for the "com", "net", "org", "info" domains and others, use a registry-registrar model consisting of hundreds of domain name registrars (see lists at ICANN or VeriSign). In this method of management, the registry only manages the domain name database and the relationship with the registrars. The "registrants" (users of a domain name) are customers of the registrar, in some cases through additional layers of resellers.