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Newbie here; how can domains know what my ISP is?

Hello NextDNS users, 

 

I have recently gotten into privacy a lot more and started using NextDNS. I have set it up correctly, I think. The reason why I think I did is because I get a 'running' result to the 'nextdns status' query.

I have incidentally went on a What-is-my-IP-address kind of site and, to my surprise, learned that it knew what ISP I'm using. On top of that, they are reporting a IP address that is roughly correct, which is perplexing me. However, I'm not sure whose IP that is: mine or mine ISP. 

I have checked the settings on my.nextdns.io and they are set to hide my IP address.

A little help clarifying this would be nice. Thanks

1 reply

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    • Mike_V
    • 8 hrs ago
    • Reported - view

    First, let me say that NextDNS is not a VPN service. You can't hide your IP address from sites that you browse to using NextDNS.

    If you're referring to the Anonymized EDNS Client Subnet setting, that is related to content delivery networks and manipulating a DNS extension to prevent the CDN's DNS servers from getting info about your ISP (the subnet that your IP address is part of). This doesn't block your IP address from sites you visit, just from the DNS servers of the CDN service that a site may use.

    The only way to prevent a website from knowing your IP address is to use a VPN service. Then the site will get the IP address of your VPN service, and your VPN service potentially knows everywhere that you browse to (so make sure that you trust your VPN service).

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