While I suspect this may be old news to a lot of the HN crowd, this article interesting information that a lot of people may not know. I ran a website years ag

While I suspect this may be old news to a lot of the HN crowd, this article interesting information that a lot of people may not know. I ran a website years ago that was targeted towards college students and would pretty consistently see many (hundreds) different UAs under the same IPv4 address due to NAT. Let alone proxies, VPNs, etc. Yet every once and a while someone will suggest the idea of rate limiting based on IP so it's definitely not universal knowledge even among developers how common it is for multiple users to share the same IPv4.