You can use a sub domain black list for things like this, for example: https://github.com/sandeepshetty/subdomain-blacklist/blob/master/subdomain-blacklist.txt

You can use a sub domain black list for things like this, for example: https://github.com/sandeepshetty/subdomain-blacklist/blob/master/subdomain-blacklist.txt https://github.com/sandeepshetty/subdomain-blacklist/blob/ma...