Kristopher,
That machine is definitely scanning those ranges, SWG knows that for sure. A points of clarification though:
SWG will not block an IP scan it's own. Anything in Potential Attacks is not blocked by default as these signatures/patterns are called 'Potential' for a reason - they could also be non-malicious depending on the circumstance. There are definitely legitimate or coincidental reasons for machines to do IP scans, so we don't call that malicious on it's own.