The IP search won't allow wild cards, so the only way is for logs or reports, but you can't run scans from reports, but you CAN from logs if you use like "computer status" then the wildcards in the IP address selection on the right in advanced options..
So Symantec needs to add the ability to search the clients tree structure using IP address, but allow wildcards.
I can search and come up with addresses = or <= or >= but can't do a search for IP addresses = to 111.222.333.* for example.
Bummer