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Reverse lookup is a procedure of using a value to retrieve a unique key in an associative array.

Applications of reverse lookup include

• reverse DNS lookup, which provides the domain name associated with a particular IP address,
• reverse telephone directory, which provides the name of the entity associated with a particular telephone number,
• reverse image search, which provides similar images to the one provided.

See also

• Inverse function
• Reverse dictionary

References

1. Downey, Allen (2012), Think Python, O'Reilly Media, p. 125, ISBN 9781449330729.
2. Sheresh, Beth; Sheresh, Doug (2001), Understanding Directory Services, Sams Publishing, p. 237, ISBN 9780672323058.
3. Lane, Carole A. (2002), Naked in Cyberspace: How to Find Personal Information Online, Information Today, Inc., p. 144, ISBN 9780910965507.

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