Where do I find the comment IP address? I am searching for comments ip address in D8 and I can't find where they are located in database. In D7 it was easy to find. 

Is there a chance that D8 is not storing the commenters ip address? If it is not, how can I store it?
IP addresses are stored in the hostname field of the comment entity (which you'd usually find in the comment_field_data table).

This functionality is disabled by default, though (see Stop logging comment IP addresses by default). To enable it, it looks like you need to set the config manually, e.g.

 \Drupal::configFactory()-&gt;getEditable('comment.settings')
   -&gt;set('log_ip_addresses', TRUE)
   -&gt;save(TRUE);


After running that, IP addresses will start being logged in the hostname field.