diff --git a/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/controller/IpRegionDemoController.java b/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/controller/IpRegionDemoController.java
index 1fba4f521..bb1c882ef 100644
--- a/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/controller/IpRegionDemoController.java
+++ b/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/controller/IpRegionDemoController.java
@@ -64,10 +64,10 @@ public class IpRegionDemoController {
         IpRegion region = ipToRegionService.getRegionByIp(ip);
         if (Objects.nonNull(region)) {
             result.setCountry(region.getCountry())
-                    .setRegion(region.getRegion())
                     .setProvince(region.getProvince())
                     .setCity(region.getCity())
                     .setIsp(region.getIsp())
+                    .setCountryCode(region.getCountryCode())
                     .setInnerIp(region.isInnerIp())
                     .setChinaIp(region.isChinaIp());
         }
diff --git a/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/result/IpRegionDemoResult.java b/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/result/IpRegionDemoResult.java
index af405ad43..4bdff2462 100644
--- a/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/result/IpRegionDemoResult.java
+++ b/daxpay-demo/src/main/java/cn/daxpay/open/demo/ipregion/result/IpRegionDemoResult.java
@@ -17,9 +17,6 @@ public class IpRegionDemoResult {
     /// 国家
     private String country;
 
-    /// 区域
-    private String region;
-
     /// 省份
     private String province;
 
@@ -29,6 +26,9 @@ public class IpRegionDemoResult {
     /// ISP 运营商
     private String isp;
 
+    /// 国家码(iso-alpha2, 如 CN/HK/US)
+    private String countryCode;
+
     /// 格式化后的归属地文本（与审计日志 location 字段同源）
     private String regionStr;
 
diff --git a/daxpay-platform/daxpay-platform-capability/capability-audit-log/pom.xml b/daxpay-platform/daxpay-platform-capability/capability-audit-log/pom.xml
index 951801881..d6f2f6817 100644
--- a/daxpay-platform/daxpay-platform-capability/capability-audit-log/pom.xml
+++ b/daxpay-platform/daxpay-platform-capability/capability-audit-log/pom.xml
@@ -71,6 +71,13 @@
             <artifactId>common-translate</artifactId>
             <version>${project.version}</version>
         </dependency>
+
+        <!-- 测试包 -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
 
diff --git a/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpRegion.java b/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpRegion.java
index 4b42ae715..b3f4d0fa3 100644
--- a/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpRegion.java
+++ b/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpRegion.java
@@ -8,6 +8,7 @@ import java.util.List;
 
 /// # IP对应地址区域信息
 ///
+/// 官方 ip2region v4.xdb 数据格式: `国家|省份|城市|ISP|国家码(iso-alpha2)`, 五段定长。
 @Data
 @Accessors(chain = true)
 public class IpRegion {
@@ -17,18 +18,18 @@ public class IpRegion {
     /// 国家
     private String country;
 
-    /// 区域
-    private String region;
-
     /// 省份
     private String province;
 
     /// 城市
     private String city;
 
-    /// ISP
+    /// ISP 运营商
     private String isp;
 
+    /// 国家码(iso-alpha2, v4 末尾段, 如 CN/HK/US)
+    private String countryCode;
+
     /// 是否内网地址
     public boolean isInnerIp(){
         return "内网IP".equals(isp);
@@ -40,30 +41,51 @@ public class IpRegion {
     }
 
     /// 是否国内直辖市
+    ///
+    /// v4 数据省名可能带"市"后缀(如"北京市"), 归一化后比对, 与 GeoFenceUtil.normalizeRegionName 口径一致
     public boolean isProvinceLevel(){
         return "中国".equals(country)&&
-                PROVINCE_LEVEL_CITY.contains(province);
+                PROVINCE_LEVEL_CITY.contains(normalizeName(province));
     }
 
     /// 是否港澳台
     public boolean isBigChina(){
         return "中国".equals(country)&&
-                BIG_CHINA.contains(province);
+                BIG_CHINA.contains(normalizeName(province));
     }
 
-    /// 国家|区域|省份|城市|ISP
+    /// 官方 v4.xdb 格式: 国家|省份|城市|ISP|国家码
+    ///
+    /// 防御性取值: 记录段数可能不足(国外/内网等短记录), 逐段判空, 不足不抛异常
     public static IpRegion init(List<String> ipInfo){
         IpRegion ipRegion = new IpRegion();
         if (CollUtil.isEmpty(ipInfo)){
             return ipRegion;
         }
-        ipRegion.country = ipInfo.get(0);
-        ipRegion.region = ipInfo.get(1);
-        ipRegion.province = ipInfo.get(2);
-        ipRegion.city = ipInfo.get(3);
-        ipRegion.isp = ipInfo.get(4);
+        ipRegion.country = safeGet(ipInfo, 0);
+        ipRegion.province = safeGet(ipInfo, 1);
+        ipRegion.city = safeGet(ipInfo, 2);
+        ipRegion.isp = safeGet(ipInfo, 3);
+        ipRegion.countryCode = safeGet(ipInfo, 4);
 
         return ipRegion;
 
     }
+
+    /// 安全取值: 越界返回 null 而非抛异常
+    private static String safeGet(List<String> ipInfo, int index) {
+        return index < ipInfo.size() ? ipInfo.get(index) : null;
+    }
+
+    /// 归一化地区名: 去首尾空格, 去掉结尾一个"市"或"省"
+    private static String normalizeName(String name) {
+        if (name == null) {
+            return "";
+        }
+        String result = name.trim();
+        if (result.endsWith("市") || result.endsWith("省")) {
+            result = result.substring(0, result.length() - 1);
+        }
+        return result;
+    }
 }
diff --git a/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpToRegionService.java b/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpToRegionService.java
index 696c4b625..48cd28def 100644
--- a/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpToRegionService.java
+++ b/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/main/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpToRegionService.java
@@ -100,7 +100,7 @@ public class IpToRegionService {
         }
 
         try {
-            // 城市Id|国家|区域|省份|城市|ISP
+            // 官方 v4.xdb 格式: 国家|省份|城市|ISP|国家码(iso-alpha2)
             String search = searcher.search(ip);
             List<String> ipInfo = StrUtil.split(search, "|");
             return IpRegion.init(ipInfo);
diff --git a/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/test/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpRegionTest.java b/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/test/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpRegionTest.java
new file mode 100644
index 000000000..121a2956b
--- /dev/null
+++ b/daxpay-platform/daxpay-platform-capability/capability-audit-log/src/test/java/cn/daxpay/open/platform/capability/audit/log/service/ip2region/IpRegionTest.java
@@ -0,0 +1,81 @@
+package cn.daxpay.open.platform.capability.audit.log.service.ip2region;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/// # IpRegion 解析单元测试
+///
+/// 锁定官方 ip2region v4.xdb 五段格式 `国家|省份|城市|ISP|国家码` 的字段映射,
+/// 防止再次退化为旧版 v2/v3 的 `国家|区域|省份|城市|ISP` 错位解析。
+class IpRegionTest {
+
+    @Test
+    @DisplayName("v4 标准五段记录: 字段映射正确")
+    void init_standardV4Record_shouldMapFields() {
+        // 国家|省份|城市|ISP|国家码
+        IpRegion region = IpRegion.init(List.of("中国", "山东省", "济南市", "电信", "CN"));
+
+        assertEquals("中国", region.getCountry());
+        assertEquals("山东省", region.getProvince());
+        assertEquals("济南市", region.getCity());
+        assertEquals("电信", region.getIsp());
+        assertEquals("CN", region.getCountryCode());
+    }
+
+    @Test
+    @DisplayName("空记录: 返回空对象不抛异常")
+    void init_emptyList_shouldReturnBlank() {
+        IpRegion region = IpRegion.init(List.of());
+
+        assertNull(region.getCountry());
+        assertNull(region.getProvince());
+        assertNull(region.getCity());
+        assertNull(region.getIsp());
+        assertNull(region.getCountryCode());
+    }
+
+    @Test
+    @DisplayName("短记录(3段): 防御取值, 后段为 null 不抛异常")
+    void init_shortRecord_shouldNotThrow() {
+        IpRegion region = IpRegion.init(List.of("中国", "山东省", "济南市"));
+
+        assertEquals("中国", region.getCountry());
+        assertEquals("山东省", region.getProvince());
+        assertEquals("济南市", region.getCity());
+        assertNull(region.getIsp());
+        assertNull(region.getCountryCode());
+    }
+
+    @Test
+    @DisplayName("国内普通城市: isChinaIp=true, isProvinceLevel=false")
+    void isChinaIp_normalCity_shouldPass() {
+        IpRegion region = IpRegion.init(List.of("中国", "山东省", "济南市", "电信", "CN"));
+
+        assertTrue(region.isChinaIp());
+        assertFalse(region.isProvinceLevel());
+    }
+
+    @Test
+    @DisplayName("直辖市(省名带市后缀): isProvinceLevel 归一化后识别")
+    void isProvinceLevel_directCityWithSuffix_shouldDetect() {
+        // v4 数据省名可能带"市"后缀
+        IpRegion region = IpRegion.init(List.of("中国", "北京市", "北京", "电信", "CN"));
+
+        assertTrue(region.isProvinceLevel());
+    }
+
+    @Test
+    @DisplayName("港澳台: isBigChina 识别")
+    void isBigChina_hk_shouldDetect() {
+        IpRegion region = IpRegion.init(List.of("中国", "香港", "香港", "HKT", "HK"));
+
+        assertTrue(region.isBigChina());
+    }
+}