is_private_ip

CREATE OR REPLACE FUNCTION is_private_ip(p_prefix inet) RETURNS boolean AS
$BODY$
BEGIN

	RETURN (
	SELECT 
	CASE
		WHEN '10.0.0.0/8'::inet >> p_prefix::inet 
			OR '192.168.0.0/16'::inet >> p_prefix::inet 
			OR '172.16.0.0/12'::inet >> p_prefix::inet THEN True
		ELSE False
	END);
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;