diff --git a/server/WebApi.cpp b/server/WebApi.cpp
index 49588b60..26ac4401 100755
--- a/server/WebApi.cpp
+++ b/server/WebApi.cpp
@@ -2344,23 +2344,26 @@ void installWebApi() {
        CHECK_SECRET();
        CHECK_ARGS("timeout_ms");
 
-       auto result = std::make_shared<Value>(std::move(val));
-       auto complete_token = std::make_shared<onceToken>(nullptr, [result, headerOut, invoker]() {
-           invoker(200, headerOut, result->toStyledString());
-       });
-       auto lam_search = [complete_token, result](const std::map<string, string> &device_info,
-                                                  const std::string &onvif_url) {
-           Value obj;
-           obj["onvif_url"] = onvif_url;
-           for (auto &pr : device_info) {
-               obj[pr.first] = pr.second;
-           }
-           (*result)["data"].append(std::move(obj));
-           //继续等待扫描
-           return true;
-       };
-       OnvifSearcher::Instance().sendSearchBroadcast(std::move(lam_search), allArgs["timeout_ms"]);
-   });
+        string subnet_prefix = allArgs["subnet_prefix"];
+
+        // if (subnet_prefix.empty()) {
+        //     subnet_prefix = "192.168.1"; //default ip prefix
+        // }
+
+        auto result = std::make_shared<Value>(std::move(val));
+        auto complete_token = std::make_shared<onceToken>(nullptr, [result, headerOut, invoker]() { invoker(200, headerOut, result->toStyledString()); });
+        auto lam_search = [complete_token, result](const std::map<string, string> &device_info, const std::string &onvif_url) {
+            Value obj;
+            obj["onvif_url"] = onvif_url;
+            for (auto &pr : device_info) {
+                obj[pr.first] = pr.second;
+            }
+            (*result)["data"].append(std::move(obj));
+            //继续等待扫描
+            return true;
+        };
+        OnvifSearcher::Instance().sendSearchBroadcast(move(subnet_prefix), std::move(lam_search), allArgs["timeout_ms"]);
+    });
 
     api_regist("/index/api/getStreamUrl", [](API_ARGS_MAP_ASYNC) {
         CHECK_SECRET();
diff --git a/src/Onvif/Onvif.cpp b/src/Onvif/Onvif.cpp
index 3e88abf3..35f49d6a 100644
--- a/src/Onvif/Onvif.cpp
+++ b/src/Onvif/Onvif.cpp
@@ -54,17 +54,17 @@ OnvifSearcher::OnvifSearcher() {
     _poller = EventPollerPool::Instance().getPoller();
 }
 
-void OnvifSearcher::sendSearchBroadcast(onDevice cb, uint64_t timeout_ms) {
+void OnvifSearcher::sendSearchBroadcast(std::string subnet_prefix, onDevice cb, uint64_t timeout_ms) {
     weak_ptr<OnvifSearcher> weak_self = shared_from_this();
-    _poller->async([weak_self, cb, timeout_ms]() mutable {
+    _poller->async([weak_self, cb, timeout_ms, subnet_prefix]() mutable {
         auto strong_self = weak_self.lock();
         if (strong_self) {
-            strong_self->sendSearchBroadcast_l(std::move(cb), timeout_ms);
+            strong_self->sendSearchBroadcast_l(move(subnet_prefix), std::move(cb), timeout_ms);
         }
     });
 }
 
-void OnvifSearcher::sendSearchBroadcast_l(onDevice cb, uint64_t timeout_ms) {
+void OnvifSearcher::sendSearchBroadcast_l(const std::string &subnet_prefix, onDevice cb, uint64_t timeout_ms) {
     static struct sockaddr_in s_search_address;
     static onceToken s_token([]() {
         s_search_address.sin_family = AF_INET;
@@ -113,9 +113,20 @@ void OnvifSearcher::sendSearchBroadcast_l(onDevice cb, uint64_t timeout_ms) {
     auto &ref = _cb_map[uuid];
     ref.cb = std::move(cb);
     ref.timeout_ms = timeout_ms;
+    std::string ip;
+    struct sockaddr_in target {};
 
     for (auto &sock : _sock_list) {
-        sock->send(xml, (struct sockaddr *) &s_search_address, sizeof(s_search_address));
+        sock->send(xml, (struct sockaddr *)&s_search_address, sizeof(s_search_address));        
+        if (!subnet_prefix.empty()) {
+            for (int i = 1; i <= 254; ++i) {
+                ip = subnet_prefix + "." + std::to_string(i);
+                target.sin_family = AF_INET;
+                target.sin_port = htons(3702);
+                inet_pton(AF_INET, ip.c_str(), &target.sin_addr);
+                sock->send(xml, (struct sockaddr *)&target, sizeof(target));
+            }
+        }
     }
 }
 
diff --git a/src/Onvif/Onvif.h b/src/Onvif/Onvif.h
index 0aa575d0..4e77a694 100644
--- a/src/Onvif/Onvif.h
+++ b/src/Onvif/Onvif.h
@@ -23,12 +23,12 @@ public:
     OnvifSearcher();
 
     static OnvifSearcher &Instance();
-    void sendSearchBroadcast(onDevice cb = nullptr, uint64_t timeout_ms = 10 * 1000);
+    void sendSearchBroadcast(std::string subnet_prefix, onDevice cb = nullptr, uint64_t timeout_ms = 10 * 1000);
 
 private:
     void onDeviceResponse(const toolkit::Buffer::Ptr &buf, struct sockaddr *addr, int addr_len);
     void onGotDevice(const std::string &uuid, std::map<std::string, std::string> &device_info, const std::string &onvif_url);
-    void sendSearchBroadcast_l(onDevice cb, uint64_t timeout_ms);
+    void sendSearchBroadcast_l(const std::string &subnet_prefix, onDevice cb, uint64_t timeout_ms);
 
 private:
     struct onDeviceCB{