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What are thick and thin entries?

Registries satisfy their WHOIS obligations using different delivery services depending upon their contract terms. The two common models are often characterized as “thin” and “thick” WHOIS registries. A thin registry only includes technical data sufficient to identify the sponsoring registrar, status of the registration, and creation and expiration dates for each registration in its WHOIS data store. .COM and .NET are examples of thin registries. Thick registries maintain the registrant’s contact information and designated administrative and technical contact information, in addition to the sponsoring registrar and registration status information supplied by a thin registry. .INFO and .BIZ are examples of thick registries.