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HTMLHelp Forums _ Server-side Scripting _ Detecting DNS-server
Posted by: pandy Oct 13 2017, 03:17 AM
Can a site detect what DNS server a visitor uses? I found this.
https://security.stackexchange.com/questions/129917/how-does-a-website-know-the-dns-server-a-client-uses
Not the JavaScript idea, the random hostname setup.
Are there other ways?
Posted by: jimlongo Nov 9 2017, 10:57 PM
Not easily I don't think, but try here https://stackoverflow.com/questions/10721731/is-it-possible-to-detect-visitor-dns-server
Posted by: Christian J Nov 10 2017, 05:09 AM
I don't know anything about this, but doesn't a visitor normally use his ISP's DNS server (and the ISP is revealed by the visitor's IP)? Or are you thinking about DNS leaks when using VPNs or other anonymizing methods?
Posted by: pandy Nov 11 2017, 08:41 AM
QUOTE(jimlongo @ Nov 10 2017, 04:57 AM) 
Not easily I don't think, but try here https://stackoverflow.com/questions/10721731/is-it-possible-to-detect-visitor-dns-server
Thanks!
Posted by: pandy Nov 11 2017, 08:47 AM
QUOTE(Christian J @ Nov 10 2017, 11:09 AM)
I don't know anything about this, but doesn't a visitor normally use his ISP's DNS server (and the ISP is revealed by the visitor's IP)? Or are you thinking about DNS leaks when using VPNs or other anonymizing methods?
Normally yes, but I don't think it's that unusual not to. There are several reasons why one could prefer to use other DNS servers. I'm not interested in doing any DNS spying myself. I suspected a site was doing it and got curious if it was even possible. Now I have forgotten what site it was, but I'm still curious.
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