A NIC handle (Network Information Centre handle) is a unique alphanumeric character sequence that represents an entry in the databases maintained by Network Information Centres. When a new domain name is registered with a domain name registrar, a NIC handle is assigned by the registrar to the particular set of information associated with that domain name (such as who registered it and a contact e-mail address). Once a domain name has been registered, its NIC handle can be used to search for that record in the database.
NIC handle system in limited modern use
The NIC Handle system is no longer commonly used by domain name registries. It was previously possible to query WHOIS by NIC handle, and see all the domains registered by that NIC handle, but this service was discontinued (presumably due to spam).
NIC Handles are still used extensively in the RIPE Database to identify people and business roles.
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