There are ~300,000 Pure-FTPd instances: https://www.shodan.io/search?query=product%3Apure-ftpd+port%3A21 https://www.shodan.io/search?query=product%3Apure-ftpd+

There are ~300,000 Pure-FTPd instances: https://www.shodan.io/search?query=product%3Apure-ftpd+port%3A21 https://www.shodan.io/search?query=product%3Apure-ftpd+port%... Not sure how to fingerprint Paradise FTP (searching for "Welcome to Paradise" also returned some non-relevant results) but there aren't many that contain "paradise" in their welcome banner. Shodan also fingerprints lots of other FTP software (check out the "Top Products" section): https://www.shodan.io/report/WHJBsZqV https://www.shodan.io/report/WHJBsZqV ProFTPD is by far the most popular choice at the moment. Note: Doing a search that uses a filter (ex: "product") requires a free Shodan account. None of the above require paid access, you just need a free account.