Network Access Identifier
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In computer networking, the Network Access Identifier (NAI) is a standard way of identifying users who request access to a network. The standard syntax is "user@realm". Sample NAIs include (from RFC 4282):
bob joe@example.com fred@foo-9.example.com fred.smith@example.com fred_smith@example.com fred$@example.com fred=?#$&*+-/^smith@example.com eng.example.net!nancy@example.net eng%nancy@example.net @privatecorp.example.net \(user\)@example.net alice@xn--tmonesimerkki-bfbb.example.net
Network Access Identifiers were originally defined in RFC 2486, which has been superseded by RFC 4282. The latter RFC is the current standard for the NAI. NAIs are commonly found as user identifiers in the RADIUS and Diameter network access protocols and the EAP authentication protocol.