Considerations for the use of DNS Reverse Mapping

Document Type Expired Internet-Draft (individual)
Authors Daniel Senie  , Andrew Sullivan 
Last updated 2021-06-19 (latest revision 2008-03-13)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Mapping of addresses to names is a feature of DNS. Many sites implement it, many others do not. Some applications attempt to use it as a part of a security strategy. This document outlines what should be taken into account when deciding whether to implement reverse mappings of addresses to names, suggests that site administrators implement reverse mappings if there are no strong considerations against such mappings, and provides considerations to be taken into account when using reverse mappings.


Daniel Senie (
Andrew Sullivan (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)