Hi Jaco,
IPAM Express does not do SNMP queries, it uses a process similar to nmap.
DDI (NIOS 6.10) with Network Insight does do this. In order to test this you will need to do a full evaluation of DDI with Network Insight because two appliances are used to collect all the data. The link to request an evaluation is here: http://www.infoblox.com/downloads/software/network-insight-trial
Please let me know if I can help you with anything else. And thanks for your interest! Allison