I am interested in finding out whether my (or any) current ISP (Internet Service Provider) uses a technology known as "perma-cookie" oder "sticky cookie" when I am browsing the internet.
This consists of inserting a special HTTP header into every HTTP Request sent via their network. It would allow the visited site to uniquely identify a user (household/ISP customer) and, with the help from the ISP, get specific personal information about that user.
Verizon and AT&T in the US are currently known for doing this, according to the following articles:
I am not located in the US, so this specific case does not apply to me. However, how can I find out whether my (or any) ISP is using such cookies? Are there any other (international) test pages?
Note: I am not talking about the evercookie.
Note2: If any of the mods thinks this is off-topic because of the request of (off-site) test pages, feel free to remove that part and this note. I am mostly interested in how to find out generally.