Hello Aaron, I just discussed with you my issue and as proposed by you, I send this e-mail in order to summarize once again what I am asking for: I am producing a visualization (with Processing) about data of the English Wikipedia. In particular, I want to produce a world map that shows from which places people edit Wikipedia articles. I can get the location of anonymous users by their IP-address, however, for privacy reasons, I don’t get the IP-address of registered users (the API-query ‘list=checkuser’ requires special rights that I don’t have). So, I would like to ask whether you can give me a set containing all IP-addresses of registered users of the English Wikipedia. Important: I am only interested in the IP-addresses - I DON’T need to know how many times registered users edited with their IP-address and I DON’T need to know their usernames. If you wish, I can ask my professor to send you a confirmation e-mail that I am writing my Master Thesis about Wikipedia. I am looking forward to your answer and thank you a lot for your help! Thomas Legler