In order to list resources registered to Classic ARC GIIS use command:
ldapsearch -h arc-emi.grid.upjs.sk -p 2135 -x -b 'mds-vo-name=ARC-EMI,o=grid' -s base giisregistrationstatus
To list resources registered to Cloud of ISIS services use command:
isistest -i http://arc-emi.grid.upjs.sk:60000/isis -m Query "/RegEntry"