A reverse phone lookup starts with the number and ends with a name, and RevLookup offers one for free. Enter any U.S. number in the search box to see the owner's full name plus extra details when they exist. The process needs no sign-up, no credit card and no payment of any kind. RevLookup operates independently, so what you see is not bent by corporate interests. Numbers with other country codes, such as +34 for Spain or +31 for the Netherlands, can be looked up the same way, which helps with calls from abroad.