LEM filtering for System Name versus IP

I often need to search for logs across a specific set of nodes managed by LEM, when doing this I normally use the "DetectionIP" as the key field.  The problem that I am running into is I can't use the IP's of the systems like I want, I instead have to use the actual name of the system because LEM has resolved it.

For a field called DetectionIP I guess I expect that should always be an IP and never a system name.  If LEM does resolve the system name that should be stored in a different field.  The problem that this causes is inconsistency in the DetecionIP field where I never know for sure if it's going to be an IP or a system name.

Any thoughts on how to get around this issue?

Thanks in advance for any suggestions.