Usage
An LDAP server may return referrals to other servers for requests that it cannot fulfill itself. This requires a naming structure for LDAP entries so one can find a server holding a given DN or distinguished name, a concept defined in the X.500 Directory and also used in LDAP. Another way of locating LDAP servers for an organization is a DNS server resource record (SRV).
An organization with the domain example.org may use the top level LDAP DN dc=example,dc=org (where dc means domain component). If the LDAP server is also named ldap.example.org, the organization's top level LDAP URL becomes ldap://ldap.example.org/dc=example,dc=org.
Primarily two common styles of naming are used in both X.500 and LDAPv3. These are documented in the ITU specifications and IETF RFCs. The original form takes the top level object as the country object, such as c=US, c=FR. The domain component model uses the model described above. An example of country based naming could be c=FR, o=Some Organization, ou=Some Organizational Unit L=Locality, or in the US: c=US, st=CA, o=Some Organization ou=Organizational Unit, L=Locality, and CN=Common Name.
Read more about this topic: Lightweight Directory Access Protocol
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