There are several directories available to NASA and NASA HQ employees for locating and/or searching for online information about employees and colleagues.

NASA Enterprise Directory
NED is NASA’s primary online phone and information directory. It is the primary storage location for all Centers’ directory information. NED is replacing the x500 Directory.
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HQ Directory
The NASA Headquarters Directory contains a structured listing of HQ organizations, personnel, and services arranged by category. This directory is published, distributed, and posted online twice a year.
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HQ eDirectory
Search the HQ eDirectory using various search criteria such as name, office ID, office title, e-mail address, room or phone number, etc.
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Global Address List (GAL)
The GAL is the "Select Names" pop-up box that appears when you address e-mail messages and provides a list of NASA workers by "last name, first name."