This information may be used by root name servers that are authoritative for domain names allocated by a registry. The root name servers for the domain name IN-ADDR.ARPA, which is used for mapping IP addresses to domain names, may also rely on delegated domain name server information in a registry database. Host objects - Some registry databases use host objects to represent information about each delegated domain name server. These objects may include IP address information for the name server host as well as point of contact information. One host object may be associated with one or multiple domain name or IP address allocation records.
Registries facilitate transactions to create, modify, and remove database objects.
The access to modify or remove existing registry database objects is typically controlled by various authentication methods that attempt to verify the person requesting the change is authorized to make the change. Authentication methods vary by registry. One commonly used method of transaction authentication is used with email-based transaction processing. This method attempts to match the email address of the requester to an email address associated with an existing database object. Because it is possible to forge an email address when sending email, this authentication scheme is not considered secure, and can leave database objects vulnerable to unauthorized modification or deletion.