Steven Black's hosts compilation [1] is a good start for what to disallow. For URL shorteners, you could disallow URLs that trigger an HTTP redirect (e.g. HTTP

Steven Black's hosts compilation [1] is a good start for what to disallow. For URL shorteners, you could disallow URLs that trigger an HTTP redirect (e.g. HTTP 301), or you could follow the chain of redirects and apply your rules to the terminal URL. [1] https://github.com/StevenBlack/hosts https://github.com/StevenBlack/hosts