https://www.revlookup.com

RevLookup is a free reverse phone lookup for U.S. numbers. Put the number into the search field and the owner's full name comes up, sometimes with an address or other available details. Nothing has to be created or paid for first, not even a profile. The people behind it work independently, without corporate influence, and they put accuracy first. It also accepts numbers from many other countries, among them Belgium, Switzerland, Denmark and South Korea, so one tool covers calls from several regions.