This plugin blocks unwanted visitors from accessing MyBB by their IP address or origin country. You can choose to block them from all pages, or only registration page.

It uses the IP2Location BIN database to locate the country information for blocking.
You may download the BIN database at the following path:

Free LITE BIN database: http://lite.ip2location.com/database-ip-country
Commercial BIN database: http://www.ip2location.com/databases/db1-ip-country

IP2Location.io Geolocation API service also supported.

Sign up for a free service at https://www.ip2location.io