Did you try to discover via agent ?
Customer Support Engineer
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You could import via csv the IPs and tru Host Connect by SNMP. It will populate the IPprobe attribute even in case of no SNMP agent.
EMEA Technical Success
You're going to need firewall rules for discovery anyway or have the probes on a subnet with those rules already
If nmap is allowed, read up on Range IPs by nmap
You can discover servers that are VMs through different virtualizaiton jobs. But then again you need shell discovery (ip first) to the vcenter or HMC or hyperV machines etc