WIPmania provides IP to country database and API which is free to use for both personal & commercial projects.
The database comes in SQL, CIDR & text formats & updated in every 2 months.
If you don’t want to use the database and use the API, a simple query like:
http://api.wipmania.com/123.45.67.89?google.com
returns you a 2 digit country code (google.com is the URL where the query is made from). API usage is free until 10,000 queries/day.
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