Hacker News Reader

Comment by shasts | Hacker News Reader

If I choose their DNS, the website shows a text at the bottom that says "You are using dns0.eu"

How does the website know I'm using their DNS? I couldn't find anything in the HTTP header that would help them with this.

https://imgur.com/fMZwxYz

View on HN

JS does a GET request every 2 seconds or so to some random subdomain (probably to avoid caching): https://i.vgy.me/qCTabA.png

The JSON response contains 'status: "unconfigured"' when you're not using their resolver and 'status: "ok"' when you are: https://i.vgy.me/iVgIe1.png

That green bar just appears after a "ok" response (no page reload needed).

stupid q here but what font is your terminal using from your screenshot pic

Iosevka: https://typeof.net/Iosevka/

Here's an open source nameserver that helps ID DNS resolver in use: https://github.com/redirect2me/which-dns

They could be giving out different IP (or CNAME) for people using their DNS. Then the site is just slightly different depending on how it is accessed. or i suppose they could be looking at logs of the ips using their dns and checking all visitors to the website, but that would be wild.

ooh they could also have a host that is only resolvable from those servers, and have the front end dynamically load that message from that host. and if it fails it does not show anything.

I guess they redirect you to a different IP than they publish in the public DNS?

Reply on news.ycombinator.com