X500Standard.com

X.500 Standard status
(Implementors' Guide)

How to be involved

More Information

Tutorial section 1
X.500 General

Tutorial section 2
X.509 specific

X.509 at work

X.500 Specifications not freely available

The X.500 Standards documentation can be found on the website of the International Telecommunications Union - Telecommunication Standardization Sector (ITU-T). In the table below you can either:

Follow the "Latest" link to purchase the latest edition of the document
Follow the "Other" link to get a wider choice, like allowing allowing access to earlier editions.

X.500	The Directory: Overview of concepts, models and services	Latest	Other
X.501	The Directory: Models	Latest	Other
X.509	The Directory: Public-key and attribute certificate frameworks	Latest	Other
X.511	The Directory: Abstract service definition	Latest	Other
X.518	The Directory: Procedures for distributed operation	Latest	Other
X.519	The Directory: Protocol specifications	Latest	Other
X.520	The Directory: Selected attribute types	Latest	Other
X.521	The Directory: Selected object classes	Latest	Other
X.525	The Directory: Replication	Latest	Other
X.530	The Directory: Use of systems management for administration of the Directory	Latest	Other