Hi!
It used to take place in MaxPatrol8, system checks answers from host, that is 99,9% will be unavailable.
This need to be done to check, whether this request will be redirected anywhere or not.
But that was before
1.1.1.1 became DNS server.
As far as i know, now they use
2.2.2.2May be, there is the same mechanism in MP SIEM in some checks.