Инфо из geoip.inc:
/**
* @deprecated
* Lookup the three character country code for a given IP address.
*
* @note This native will overflow the buffer by one cell on an unknown ip lookup!
* @note Use geoip_code3_ex instead!
*
* @param ip The IP address to lookup.
* @param result The result buffer.
*/
native geoip_code3(const ip[], result[4]);