With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cDhcpv4ServerSharedNetFreeAddresses
Cisco Dynamic Host Configuration protocol Server Shared Net Free Addresses
1.3.6.1.4.1.9.10.102.1.4.1.1.4
The number of IPv4 addresses which are available within this shared network. If the server does not count free addresses by shared network segment, this value will be zero.
Back to CISCO-IETF-DHCP-SERVER-MIB MIB page.
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