diff --git a/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/impl/LatestMobileDeviceServiceImpl.java b/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/impl/LatestMobileDeviceServiceImpl.java
index 408ec23f..25588ffe 100644
--- a/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/impl/LatestMobileDeviceServiceImpl.java
+++ b/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/impl/LatestMobileDeviceServiceImpl.java
@@ -373,8 +373,8 @@ public class LatestMobileDeviceServiceImpl extends
 
   /**
    * 获取IP前缀段
-   * IPv4: 取前2段（如 192.168.1.100 -> 192.168）
-   * IPv6: 取前2段（如 2402:ad80:130:d1a2::1 -> 2402:ad80）
+   * IPv4: 取前3段（如 192.168.1.100 -> 192.168.1）
+   * IPv6: 取前3段（如 2402:ad80:130:d1a2::1 -> 2402:ad80:130）
    */
   private String getIpPrefix(String ip) {
     if (StringUtils.isBlank(ip)) {
@@ -385,8 +385,8 @@ public class LatestMobileDeviceServiceImpl extends
     String joinChar  = ip.contains(":") ? ":" : ".";
 
     String[] parts = ip.split(separator);
-    if (parts.length >= 2) {
-      return parts[0] + joinChar + parts[1];
+    if (parts.length >= 3) {
+      return parts[0] + joinChar + parts[1] + joinChar + parts[2];
     }
     return ip;
   }