Companies like Lead Forensics are charging people roughly in the region of £200 per month to do a reverse IP lookup. Google Analytics can do the same thing for free.
Lead Forensics state that they they have a bigger database than everyone else, but when questioned they wouldn't give any evidence of how they knew that. I find it hard to believe they know how large Google or anyone else's database is.
Let us know in the comments if you use any of these services and get a benefit from them.
If you need any help setting up Google Analytics or would like more information on how to see which pages these companies have been on please contact us via the website https://www.squareballoon.co.uk