With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnnEouHostValidateIpAddrType
cnn Eou Host Validate Ip Addr Type
1.3.6.1.4.1.9.9.484.1.4.2
The type of Internet address for a detected host.
Back to CISCO-NAC-NAD-MIB MIB page.
IPHost Network monitor allows you to monitor cnnEouHostValidateIpAddrType on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.