How do companies find your info from your IP address?

There's companies out there that will let you upload a list of IP Addresses and the system will spit back out the names, address, email, phone number sometimes even their credit score, household income data, etc connected to those IP addresses.

It won't do the whole list of IP's. Most have a 40-60% match rate. meaning you'll only be able to get the IP owners info for around half of the list you upload.

Does anyone know how they do …

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