>info attribute belong to which objectclass. It is defined in cosine.schema attributetype ( 0.9.2342.19200300.100.1.4 NAME 'info' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{2048} ) But, at least by default, isn't included in any object class. Get an LDAP client with a schema browser, GQ for example.