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Network Access Identifiers were originally defined in RFC 2486, which has been superseded by RFC 4282.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.

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