What exactly did you try to google? "username blacklist" brings up some pretty good results for me. [1] It's also worth searching github for similar blacklists.

What exactly did you try to google? "username blacklist" brings up some pretty good results for me. [1] It's also worth searching github for similar blacklists. [2][3][4][5] Overall, I'd advise against giving subdomains to users, too. [1] http://www.quora.com/How-do-sites-prevent-vanity-URLs-from-colliding-with-future-features http://www.quora.com/How-do-sites-prevent-vanity-URLs-from-c... [2] https://encrypted.google.com/search?hl=en&q=search%20github%20by%20filename#hl=en&q=subdomain+blacklist.txt+site:github.com https://encrypted.google.com/search?hl=en&q=search%20github%... [3] https://github.com/nccgroup/typofinder/blob/f0fe2ac4e5181746cf85412c39333be8a83f7896/TypoMagic/datasources/subdomains.txt https://github.com/nccgroup/typofinder/blob/f0fe2ac4e5181746... [4] https://github.com/sandeepshetty/subdomain-blacklist/blob/master/subdomain-blacklist.txt https://github.com/sandeepshetty/subdomain-blacklist/blob/ma... [5] https://gist.github.com/artgon/5366868 https://gist.github.com/artgon/5366868