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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Global Address List (GAL)
The GAL is the "Select Names" window that appears when you address e-mail messages and it provides a list of NASA employees by "last name, first name."