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Not every site uses SNI. Most probably do not. Not every site uses custom DNS for their CDN, either.

Your ISP knows way less about you if you avoid their DNS. And they are the only ones that know your legal name and billing address, usually.

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SNI is part of the first message a TLS client sends to the server - the Client Hello. TLS clients that support SNI (including all modern browsers) will typically always send the SNI extension, regardless of whether the server supports or makes use of SNI.

That's why I use IE6: for Privacy reasons.

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