With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cDhcpv4ServerSubnetTable
Cisco Dynamic Host Configuration protocol Server Subnet Table
1.3.6.1.4.1.9.10.102.1.4.2
A list of subnets that are configured in this server.
Back to CISCO-IETF-DHCP-SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor cDhcpv4ServerSubnetTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.