X.500是計算機目錄服務的標準系列。最早是ITU-T X.500開發，前身為CCITT（ITU的前身）的目錄服務系統，並於1988年首次批准，此一目錄可以成為全球目錄服務標準的一部分。[1]
 | 此條目翻譯自其他語言維基百科，需要相關領域的編者協助校對翻譯。 |
X.500協議包括：
- DAP (Directory Access Protocol)
- DSP (Directory System Protocol)
- DISP (Directory Information Shadowing Protocol)
- DOP (Directory Operational Bindings Management Protocol)
- LDAP (Lightweight Directory Access Protocol)
註釋
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