diff --git a/jap-core/src/main/java/com/fujieid/jap/core/util/RequestUtil.java b/jap-core/src/main/java/com/fujieid/jap/core/util/RequestUtil.java
index 6ff886e8b23105e9de839a6abf59fbd4b7d314d3..82d0af6ca79b0e8daf6f112c29b99918fb2e060f 100644
--- a/jap-core/src/main/java/com/fujieid/jap/core/util/RequestUtil.java
+++ b/jap-core/src/main/java/com/fujieid/jap/core/util/RequestUtil.java
@@ -75,6 +75,17 @@ public class RequestUtil {
         return getHeader("Referer", request);
     }
 
+    /**
+     * Get subdomain name
+     *
+     * @param request current HTTP request
+     * @return string
+     */
+    public static String getFullDomainName(HttpServletRequest request) {
+        StringBuffer url = request.getRequestURL();
+        return url.delete(url.length() - request.getRequestURI().length(), url.length()).toString();
+    }
+
     /**
      * Get the User-Agent of the current HTTP request
      *