X.500是计算机目录服务的标准系列。最早是ITU-T X.500开发，前身为CCITT（ITU的前身）的目录服务系统，并于1988年首次批准，此一目录可以成为全球目录服务标准的一部分。[1]
 | 此条目翻译自其他语言维基百科，需要相关领域的编者协助校对翻译。 |
X.500协议包括：
- DAP (Directory Access Protocol)
- DSP (Directory System Protocol)
- DISP (Directory Information Shadowing Protocol)
- DOP (Directory Operational Bindings Management Protocol)
- LDAP (Lightweight Directory Access Protocol)
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