To define network equipment behind the domain?

Question

Iron

Hello! Tell me if there is such an opportunity:
Find out what network equipment is used by a certain domain, there is a site for example yandex.ru, habrahabr.ru,
is it possible to determine that Yandex uses CISCO, habrahabr - Juniper?

Answer 1

In the above and in the general case - no

Answer 2

of course
, the same and those admins in Moscow are sitting

Answer 3

How about thinking for yourself? To identify some equipment, you need to have access to an environment in which you can identify some marks characteristic of it. In the case of network equipment, this is ISO2, and even better ISO1. Now answer - do you have the opportunity to access yandex.ru traffic at the ISO2 level? If there is and you know exactly how to distinguish Cisco network equipment from others, then you can :) Otherwise, no.