Where are randomly generated domain names used?

Question

Domain Name System

Today I met with incomprehensible domain names for me:

• www.kp262bbqfvl7.com
  
• www.txwi6k2od4yn42hur5jgwx.com
  
• www.ekrz5qcamx4kfc2eejk7y3svl.com
  
• .....
  

I did not succeed in making WHOIS or resolving a name in IP.
One gets the impression that these are "single-query names" - the request worked on this name, the name died.
I have a suspicion that these are the input ( not output ) nodes of the TOR network, but I could be wrong.
Please explain where such names are used and for what purpose.

Answer 1

In my version, the FQDN data flew out due to the peculiarities of the work of TOR, the link to the answer is here: link to the stack

Answer 2

also as an option for ip over dns attacks
for some open and legitimate things they will use some other names, as practice shows

Answer 3

I advise you to look in which direction (to which IP) the request went. With a high probability, this is a CnC server of some bot, and the source of the request uses DNS queries as a data exchange channel over DNS.

Answer 4

in botnets, to control botnets.

Answer 5

Botnets, viruses, spammers - the dark side, in short :)