![]() If they want to block a site, they just configure their DNS server to return an invalid IP address.įor example, let’s say they want to block Facebook. Which is just extremely inconvenient, let’s be honest.īut, unfortunately, that also gives your ISP control over your DNS queries. If there were no ISP DNS server, you’d have to type in the website’s IP address in the URL bar. The ISP returns the site’s IP address, and your browser connects to it.The ISP uses their DNS server (which acts like an Internet “phonebook) to find the IP address corresponding to the website’s name.The browser asks your ISP for the site’s IP address.When you type a website’s name in your browser’s URL bar and hit enter, this is what happens in the background: So when you use it to visit the web, the firewall traffic rules automatically apply to you. ![]() And your ISP is the one who assigns you your IP address. If such a rule says nobody on their network can connect to Facebook, all outbound/inbound connections to/from that site are automatically blocked by the firewall.Īnd like we showed you at the start, all your connections go through your ISP’s network. Basically, your ISP establishes inbound and outbound traffic rules, and the firewall enforces them. Firewallsįirewalls allow ISPs (and other network admins) to control how traffic flows over their network. How ISPs Block WebsitesĪs far as we can tell, ISPs can use three methods: 1. To learn how to bypass geo-blocks, go to our complete guide detailing what they are, how they work, and how to get around them. Here’s an example of how such a message looks like: If you visit a website, and you get a message telling you the content isn’t available in your area, that’s geo-blocking, not ISP blocking websites. It has to, otherwise you wouldn’t have web access.īecause of that, they can easily decide which websites you’re allowed to communicate with and which ones you can’t visit. Here’s the thing – when you visit a website, your connection goes through your ISP. ![]() If anyone tells you they can’t, they don’t know how Internet connections work.
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