Traditional wardialing was almost always looking for modems, but it sounds like the particular number ranges that this researcher selected didn't contain any modems at all?
I'm sure there are still plenty of modems connected to landlines, not just for ISPs still offering dialup service, but also for SCADA systems and stuff.
I'm sure there are still plenty of modems connected to landlines, not just for ISPs still offering dialup service, but also for SCADA systems and stuff.