Rapid7 set out to understand the overall internet threat exposure in general and at a country level. The researchers took the 30 most popular TCP ports and performed cross-country comparisons to come up with a National Exposure Index. The U.S. has a ridiculously high number of devices listening on all 30 ports examined in this study, landing in the top spot with over 43 million servers or devices exposing every port combination in the study. China had considerably fewer devices listening, over 11 million, yet came in fifth for most hackable country.”]

