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I have recently started using /etc/hosts to block distracting websites. For specific domains that works nicely, but is there any way to match a domain and all of its subdomains?

So, this blocks twitter and pinterest:

127.0.0.1   twitter.com
127.0.0.1   www.pinterest.com

But this doesn't block any tumblr page, and since users can create custom ones, I can't manually specify all of them:

127.0.0.1   tumblr.com

Using *.tumblr.com didn't work either. Is there some solution using the hosts file?

If not, I would also be fine with a solution involving iptables.

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