diff --git a/.vs/Ntpsync/FileContentIndex/236fe584-ec21-46fc-9d6d-bb5553e5a971.vsidx b/.vs/Ntpsync/FileContentIndex/236fe584-ec21-46fc-9d6d-bb5553e5a971.vsidx
deleted file mode 100644
index c48f23a..0000000
Binary files a/.vs/Ntpsync/FileContentIndex/236fe584-ec21-46fc-9d6d-bb5553e5a971.vsidx and /dev/null differ
diff --git a/.vs/Ntpsync/FileContentIndex/666311a6-e74e-4890-9877-958af5749b18.vsidx b/.vs/Ntpsync/FileContentIndex/666311a6-e74e-4890-9877-958af5749b18.vsidx
new file mode 100644
index 0000000..eb6ce5a
Binary files /dev/null and b/.vs/Ntpsync/FileContentIndex/666311a6-e74e-4890-9877-958af5749b18.vsidx differ
diff --git a/.vs/Ntpsync/v17/.suo b/.vs/Ntpsync/v17/.suo
index ee4f109..e4a6d92 100644
Binary files a/.vs/Ntpsync/v17/.suo and b/.vs/Ntpsync/v17/.suo differ
diff --git a/.vs/Ntpsync/v17/DocumentLayout.backup.json b/.vs/Ntpsync/v17/DocumentLayout.backup.json
index b7ba069..7cca3aa 100644
--- a/.vs/Ntpsync/v17/DocumentLayout.backup.json
+++ b/.vs/Ntpsync/v17/DocumentLayout.backup.json
@@ -68,7 +68,7 @@
               "RelativeDocumentMoniker": "Form1.cs",
               "ToolTip": "D:\\File\\Library\\Tools\\Ntpsync\\Form1.cs",
               "RelativeToolTip": "Form1.cs",
-              "ViewState": "AgIAAIUAAAAAAAAAAAAIwI8AAAAAAAAAAAAAAA==",
+              "ViewState": "AgIAAIUAAAAAAAAAAAAIwI0AAAARAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-06-27T12:15:25.553Z",
               "EditorCaption": ""
diff --git a/.vs/Ntpsync/v17/DocumentLayout.json b/.vs/Ntpsync/v17/DocumentLayout.json
index b7ba069..7cca3aa 100644
--- a/.vs/Ntpsync/v17/DocumentLayout.json
+++ b/.vs/Ntpsync/v17/DocumentLayout.json
@@ -68,7 +68,7 @@
               "RelativeDocumentMoniker": "Form1.cs",
               "ToolTip": "D:\\File\\Library\\Tools\\Ntpsync\\Form1.cs",
               "RelativeToolTip": "Form1.cs",
-              "ViewState": "AgIAAIUAAAAAAAAAAAAIwI8AAAAAAAAAAAAAAA==",
+              "ViewState": "AgIAAIUAAAAAAAAAAAAIwI0AAAARAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-06-27T12:15:25.553Z",
               "EditorCaption": ""
diff --git a/Form1.cs b/Form1.cs
index f304cf1..89bd14b 100644
--- a/Form1.cs
+++ b/Form1.cs
@@ -135,15 +135,23 @@ namespace Ntpsync
                 byte[] ntpData = new byte[48];
                 ntpData[0] = 0x1B; // LI = 0 (no warning), VN = 3, Mode = 3 (Client)
 
+                // 解析 IPv4 地址
+                var ipList = await Task.Run(() => Dns.GetHostAddresses(host));
+                var ipv4   = ipList.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);
+                if (ipv4 == null)
+                {
+                    return (DateTime.Now, false, $"{host} 无可用 IPv4 地址");
+                }
+
+                IPEndPoint endPoint = new IPEndPoint(ipv4, 123);
+
                 using (var udp = new UdpClient(AddressFamily.InterNetwork))
                 {
                     udp.Client.ReceiveTimeout = 3000; // 3 秒超时
-                    udp.Client.SendTimeout = 3000;
+                    udp.Client.SendTimeout    = 3000;
 
-                    udp.Connect(host, 123);
-
-                    // 发送请求
-                    await udp.SendAsync(ntpData, ntpData.Length);
+                    // 发送请求到指定 IPv4 端点
+                    await udp.SendAsync(ntpData, ntpData.Length, endPoint);
 
                     // 接收响应（带超时或取消）
                     var receiveTask = udp.ReceiveAsync();
@@ -161,6 +169,7 @@ namespace Ntpsync
                         return (DateTime.Now, false, $"从 {host} 获取时间失败: 超时");
                     }
 
+                    // Anycast 场景下可能由不同 IP 返回，只要端口正确即可接受
                     ntpData = receiveTask.Result.Buffer;
                 }
 
diff --git a/bin/Debug/Ntpsync.exe b/bin/Debug/Ntpsync.exe
index c245cb2..63940cd 100644
Binary files a/bin/Debug/Ntpsync.exe and b/bin/Debug/Ntpsync.exe differ
diff --git a/bin/Debug/Ntpsync.pdb b/bin/Debug/Ntpsync.pdb
index 8918a36..bcf3032 100644
Binary files a/bin/Debug/Ntpsync.pdb and b/bin/Debug/Ntpsync.pdb differ
diff --git a/obj/Debug/Ntpsync.exe b/obj/Debug/Ntpsync.exe
index c245cb2..63940cd 100644
Binary files a/obj/Debug/Ntpsync.exe and b/obj/Debug/Ntpsync.exe differ
diff --git a/obj/Debug/Ntpsync.pdb b/obj/Debug/Ntpsync.pdb
index 8918a36..bcf3032 100644
Binary files a/obj/Debug/Ntpsync.pdb and b/obj/Debug/Ntpsync.pdb differ