Needing to find all websites related to certain domains.

Here are a few of the domains of what I’m interested in.
12or15passengervanrental.com
1800paintjobli.com

These all have the same footer “Copyright © 2017 Website Design by Web.com Group, Inc.”

I’m interested in finding a list of all websites like this for leads Anyone have any advice?

Here are a few of the domains of what I'm interested in.
12or15passengervanrental.com
1800paintjobli.com

These all have the same footer "Copyright © 2017 Website Design by Web.com Group, Inc."

I'm interested in finding a list of all websites like this for leads Anyone have any advice?