How to get rid of copies of porn domains on Google?

Question

Google

Hello everyone, I will be grateful for any advice and hint. The essence of the problem is as follows: a couple of months ago, we found copies of our site in Google with various porn domains, they stupidly specified an A-record in the DNS records for the IP address of our server, we fixed this cant in the server settings and they are already more than 2 -x months are not available, but at the same time in the Google search engine, they are still there, although we give them a 404th error, what should be done in this case to correct this situation?

There is no way to add a webmaster to Google to reindex them, due to the fact that there is verification through DNS records.