The 389 Directory Server (previously Fedora Directory Server) is an LDAP (Lightweight Directory Access Protocol) server developed by Red Hat, as part of Red Hat's community-supported Fedora Project. The name 389 is derived from the port number for LDAP. Red Hat offers a version of 389 called Red Hat Directory Server via a extra subscription on top of RHEL. Red Hat Directory Server differs from 389 in that the former is rebranded with the Red Hat branding, and includes certified stable builds, customer service, and technical support. Red Hat will rebase the Red Hat version with a stable upstream 389 branch from time to time, and backport new features and critical bug fixes as necessary. The goal of the 389 Project is to get new features out quickly, but the sometimes conflicting goal of the Red Hat product is to ensure stabilty and reliability. The 389 source code is generally available under the GPLv2 license. Some components have an exception for plugin code, while other components use LGPLv2 or APL. The same applies to the Red Hat product.
389 Directory Server is being built on top of Fedora, but supports many operating systems including Red Hat Enterprise Linux 3 and later, Debian, Solaris 8 and later, and HP-UX 11i.
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