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AAAA may refer to:
Internet and computing
- AAAA protocol, within computer security, "authentication, authorization, accounting and auditing" - the AAA protocol combined with auditing
- AAAA record, also known as "IPv6 address record", maps a hostname to a 128-bit IPv6 address in the Domain Name System (DNS)
- Internet Authentication Service, as an acronym for the four main services provided: Authentication, Authorization, Accounting, and Auditing
- AAAA battery, a 1.5 volt battery, smaller than the AAA size
- Associated Actors and Artistes of America, an association of the performer trade unions Actors' Equity, AFTRA, Agma, and Agva
- American Association of Advertising Agencies
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