mc.yandex.ru – What is this service, maybe someone knows? I was looking for such a service on the site, but I did not find anything like. I know for sure that this service refers to web development.

Answer 1, Authority 100%

This domain is used Yandex.Metric

URL of the // mc.yandex.ru/watch/NEK__num give a 1-pixel gif-picture, which is useless in itself. But value represents request , not the answer to it.

Yandex collects data from requests and believes according to the received statistics. This method of collecting statistics is working without JS! It will save from him except to disable the display of pictures in the browser.

And on // mc.yandex.ru/metrika/watch.js JS part of the tracker, which can collect more data.