Old RFCs

RFC 2251: Lightweight Directory Access Protocol (v3)
RFC 2252: Attribute Syntax Definitions
RFC 2253: UTF-8 String Representation of Distinguished Names
RFC 2254: The String Representation of LDAP Search Filters
RFC 2255: The LDAP URL Format
RFC 2256: A Summary of the X.500(96) User Schema for use with LDAPv3
RFC 2829: Authentication Methods for LDAP
RFC 2830: Extension for Transport Layer Security
RFC 3377: Technical Specification
RFC 2849: The LDAP Data Interchange Format (LDIF) - Technical Specification