When researchers, or whoever, claim their scanning an altruistic service, I ask them if they would mind someone coming to their home and trying to open all the doors and windows every night. -mel beckman On Jun 19, 2022, at 6:14 PM, J. Hellenthal via NANOG <nanog@nanog.org> wrote: Had to send these guys a cease and desist a few years back as they became so noisy it was causing to much of a disconnect between information we were trying to compare. Personally I don't care who you are. Probably not hiring your services (free or not), stay off my edge. -- J. Hellenthal The fact that there's a highway to Hell but only a stairway to Heaven says a lot about anticipated traffic volume. On Jun 19, 2022, at 13:56, Amreesh Phokeer <amreesh.phokeer@gmail.com> wrote: Project Sonar from Rapid7 conducts internet-wide surveys and is kind enough to share the data with researchers: https://www.rapid7.com/research/project-sonar/ On Sun, Jun 19, 2022 at 10:24 PM Mark Seiden <mis@seiden.com<mailto:mis@seiden.com>> wrote: btw, if you want to do this yourself, you might consider using something like https://github.com/opsdisk/scantron -- Amreesh Phokeer