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Java Offline GeoIP maps any IP address to its country code

There is a newer version: 0.1.12

package com.github.tornaia.geoip;

import java.net.InetAddress;
import java.util.Optional;

public interface GeoIP {

    /**
     * Returns the country code for a specific inetAddress. For example, this would be CH for the
     * 85.1.242.106, and HU for 81.182.2.4.
     *
     * @param inetAddress the inetAddress that we want to get the country code for
     * @return two letter country code for the inetAddress denoted by inetAddress
     * @see Wikipedia: ISO_3166-2
     */
    Optional getTwoLetterCountryCode(InetAddress inetAddress);

    /**
     * Returns the country code for a specific ip address. For example, this would be CH for the
     * 85.1.242.106, and HU for 81.182.2.4.
     *
     * @param ipAddress the ip address that we want to get the country code for
     * @return two letter country code for the ip address denoted by inetAddress
     * @see Wikipedia: ISO_3166-2
     */
    Optional getTwoLetterCountryCode(String ipAddress);
}