I'm trying to figure out if the Japanese entity know as Softbank is an ISP or some sort of hosting company (like AWS).
Softbank AS17676 has over 43 million allocated IP's. Would you expect to ever get legit web-hits (ie not a bot or machine-generated hit) from a Softbank IP?
The Softbank IP's that I'm currently blocking seem to usually resolve to something.panda-world.ne.jp. I can't find any coherent or useful information as to what sort of entity panda-world.ne.jp is.