With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alDhcpStatsActiveLeases
ALTIGA Dhcp Statistics Active Leases
1.3.6.1.4.1.3076.2.1.2.20.1.1
The number of active DHCP leases.
Back to ALTIGA-DHCP-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alDhcpStatsActiveLeases on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.