Hello
I know I can buy a geolocation database that will help me to find the country (or city) of a visitor based on his IP address. But I wonder if there are any free geolocation services in which you can upload a list of (100-1000?) ip addresses and get a list of ip -> country results.
I won't be able to get the user's country in realtime in this way, but this could be useful to set the correct country of a registered user in batch mode.
Do you know a service like this?

Thanks