• From a terminal in any DC using ldbsearch:

apt-get install ldb-tools    #If not installed
ldbsearch -H /var/lib/samba/private/sam.ldb '(objectclass=computer)' dn  
ldbsearch -H /var/lib/samba/private/sam.ldb '(objectclass=computer)' dn | grep dn | cut -d"=" -f2 | cut -d, -f1 | sort -V

• From a terminal in any DC using samba-tool

samba-tool computer list

Caponato's Samba notebook. Start here or else Main menu