Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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  In Windows Active Directory, this is the name of a system user in email address format, i.e., a concatenation of username, the “@” symbol, and domain name.
NIST SP 1800-16B under User Principal Name
NIST SP 1800-16C under User Principal Name
NIST SP 1800-16D under User Principal Name