I'm looking to potentially upgrade my Wordpress hosting to improve performance. I've read through How to find web hosting that meets my requirements?. However, before moving my site to a new provider, I'd like to "test" the hosts' performance prior to signing up.

I know that it's possible to lookup who hosts a particular domain, but are there any tricks to doing this in reverse? I.e., is it possible to look up what domains are using WordPress hosted by a particular hosting provider?

Alternatively, is there a way to see what IP address blocks a web host "owns"? If I knew the address blocks, I could look at what domains where hosted by IP address.

  • Have you asked the host for a list of customers or for testimonials from current customers? Jun 29, 2020 at 14:58
  • @StephenOstermiller, yes I actually did ask for a list of customer websites using WP from the one vendor I was evaluating. They claim the information is confidential and violates company policy.
    – Trebor
    Jun 29, 2020 at 17:24

1 Answer 1


I think the only way would be to get a list of domains and then see what happens if you try to load example.com/wp-config.php - if the site uses WP it should be blank, if not there will be an error 404.

If you have some coding skills, you could write a script that looped through the domains trying to load wp-config.php and displayed the result or wrote the output to a file or emailed you or whatever.

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