The following is a list of commonly used standards that are written in ASN.1:
- X.400 (Electronic Messaging)
- X.500 (Directory Services)
- X.200 (Network communications)
- Request for Comments (RFCs) 2251-2256 (Lightweight Directory Access Protocol, or LDAP)
- Too many other RFCs to mention
http://support.microsoft.com/kb/252648