You can retrieve the following DHCP Service Reports using the API:
Default Gateways Report
Request
GET http://<Gateway_url>/get_dg_report Authorization: <token>
DHCP Utilization Report
Request
GET http://<Gateway_url>/get_dhcp_util Authorization: <token>
Subnet Report
Request
GET http://<Gateway_url>/get_subnet_report/<network_or_ip_query> Authorization: <token>