diff --git a/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/LatestMobileDeviceService.java b/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/LatestMobileDeviceService.java
index 75b7529b..11385c49 100644
--- a/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/LatestMobileDeviceService.java
+++ b/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/rds/service/user/device/LatestMobileDeviceService.java
@@ -118,7 +118,7 @@ public interface LatestMobileDeviceService extends BaseService<LatestMobileDevic
 
   /**
    * 获取用户设备指纹（增强版）
-   * 包含：手机型号 + 系统版本 + IMEI + IP段 + 编译版本
+   * 包含：手机型号 + 系统版本 + IP段 + 编译版本
    *
    * @param userId 用户ID
    * @return 设备指纹MD5字符串
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 30cef1be..d2a416ec 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
@@ -330,48 +330,41 @@ public class LatestMobileDeviceServiceImpl extends
       return "";
     }
 
-    return requestClient + "|" + phoneModel + "|" + ip;
+    return requestClient + "|" + phoneModel + "|" + getIpPrefix(ip);
   }
 
   /**
    * 构建增强版设备指纹
-   * 组成：手机型号 + 系统版本 + IMEI + IP段 + 编译版本
+   * 组成：手机型号 + 系统版本 + IP段 + 编译版本
    */
   private String buildEnhancedDeviceFingerprint(LatestMobileDevice device) {
     StringBuilder sb = new StringBuilder();
 
     sb.append(StringUtils.isBlank(device.getPhoneModel()) ? "" : device.getPhoneModel()).append("|");
     sb.append(StringUtils.isBlank(device.getPhoneSysVersion()) ? "" : device.getPhoneSysVersion()).append("|");
-    sb.append(StringUtils.isBlank(device.getImei()) ? "" : device.getImei()).append("|");
     sb.append(getIpPrefix(device.getIp())).append("|");
-    sb.append(Objects.nonNull(device.getBuildVersion()) ? device.getBuildVersion() : 0);
 
     return sb.toString();
   }
 
   /**
-   * 获取IP前缀段（提高稳定性）
-   * IPv4: 取前3段（如 192.168.1.xxx -> 192.168.1）
-   * IPv6: 取前4段（如 2a0d:5600:24:449:xxx -> 2a0d:5600:24:449）
+   * 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）
    */
   private String getIpPrefix(String ip) {
     if (StringUtils.isBlank(ip)) {
       return "";
     }
 
-    if (ip.contains(":")) {
-      String[] parts = ip.split(":");
-      if (parts.length >= 4) {
-        return parts[0] + ":" + parts[1] + ":" + parts[2] + ":" + parts[3];
-      }
-      return ip;
-    } else {
-      String[] parts = ip.split("\\.");
-      if (parts.length >= 3) {
-        return parts[0] + "." + parts[1] + "." + parts[2];
-      }
-      return ip;
+    String separator = ip.contains(":") ? ":" : "\\.";
+    String joinChar  = ip.contains(":") ? ":" : ".";
+
+    String[] parts = ip.split(separator);
+    if (parts.length >= 2) {
+      return parts[0] + joinChar + parts[1];
     }
+    return ip;
   }
 
   @Override
@@ -387,13 +380,13 @@ public class LatestMobileDeviceServiceImpl extends
 
     String requestClient = parts[0];
     String phoneModel = parts[1];
-    String ip = parts[2];
+    String ipPrefix = parts[2];
 
     return Optional.ofNullable(query()
             .select(LatestMobileDevice::getUserId)
             .eq(LatestMobileDevice::getRequestClient, requestClient)
             .eq(LatestMobileDevice::getPhoneModel, phoneModel)
-            .eq(LatestMobileDevice::getIp, ip)
+            .likeRight(LatestMobileDevice::getIp, ipPrefix)  // 前缀匹配
             .eq(LatestMobileDevice::getSysOrigin, sysOrigin)
             .last(PageConstant.formatLimit(500))
             .list())