Install necessary utilities sudo apt update && sudo apt install ldap-utils -y && sudo apt clean Some information in Estonian: https://sk.ee/uudised/ldap-kataloogi-otsing-muutus https://www.sk.ee/repositoorium/ldap/ldap-kataloogi-kasutamine ldapsearch -x -h ldap.sk.ee -b c=EE "(serialNumber=47101010033)" ldapsearch -x -h ldap.sk.ee -b c=EE "(cn=MÄNNIK,MARI-LIIS,47101010033)"