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Out-of-band refers to activity, such as communications, outside of an established band. Originally from the telecommunications concept of band but now also applied to other fields metaphorically.

General usage[edit]

  • Out-of-band agreement, an agreement or understanding between the communicating parties that is not included in any message sent over the channel but which is relevant for the interpretation of such messages


  • Out-of-band signaling, the exchange of call control information in a separate band from the data or voice stream, or on an entirely separate, dedicated channel


  • Out-of-band data, in computer networking, a separate stream of data from the main data stream
  • Out-of-band management, in computer administration, system console access, even in the event of primary network subsystem failure


  • Out-of-band authentication, user authentication over a network or channel separate from the primary network or channel; used in multi-factor authentication

See also[edit]


This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.