4 ms·So now ad companies will just require a CNAME entry in the website's DNS record.by ryanmccullagh 7y agoSo now ad companies will just require a CNAME entry in the website's DNS record.ma2rten 7y agoAnd how do they link these between different websites?Tepix 7y agoThey add the tracking stuff as URL parameters.wizzwizz4 7y agoServer-side magic – fingerprinting, behavioural detection, referer GET stubs, etc.. It's not all that difficult, though it is harder.