Your expression should work, but only if 1) you have created the “Primary IP Address” property as a global property rather than as an analysis property, and 2) if you are evaluating the expression in the session context (console/web reports). The expression won’t work in the client context.
Thanks, I ended up using the following relevance which works:
(exists (addresses of adapters whose (cidr string of it = wake on lan subnet cidr string) of network) whose (it as string as lowercase contains “10%2e0%2e15%2e” as lowercase))