The entry '''cn=nextfreeuid,ou=administration,dc=stoney-cloud,dc=org''' stores the next free UID (Unique Identifier). The UID is unique over the whole directory and is enforced through the directory and is incremented by one.
dn: cn=nextfreeuid,ou=administration,dc=stoney-cloud,dc=org
cn: nextFreeUIDnextfreeuid objectclass: inetOrgPerson sn: nextFreeUIDsstNextFreeUID
uid: 3724591
uidNumber: 3724591
Before using this attribute<code>uidNumber</code>, you need to be sure, that your directory server actually supports atomic increments (LDAP Modify-Increment). See [https://www.iana.org/assignments/ldap-parameters/ldap-parameters.xhtml Lightweight Directory Access Protocol (LDAP) Parameters] and [https://tools.ietf.org/html/rfc4525 Lightweight Directory Access Protocol (LDAP) Modify-Increment Extension (RFC4525)].
The following search should tell you, if you LDAP server supports the LDAP Modify-Increment Object Identifier Descriptor (OID 1.3.6.1.1.14):