diff --git a/Tests/Global.cs b/Tests/Global.cs
index d5ad4a11..58029899 100644
--- a/Tests/Global.cs
+++ b/Tests/Global.cs
@@ -1,5 +1,9 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
 
 namespace Tests
 {
@@ -11,5 +15,32 @@ namespace Tests
         {
             Console.WriteLine(AppDomain.CurrentDomain.BaseDirectory);
         }
+        [TestMethod]
+        public void VLESS_UUID5()
+        {
+            //https://github.com/XTLS/Xray-core/discussions/715
+
+            byte[] bytes = new byte[16];
+            var str = "example";
+
+            SHA1 sha1 = new SHA1CryptoServiceProvider();
+            byte[] StrBytes = Encoding.Default.GetBytes(str);
+
+            List<byte> byteSource = new List<byte>();
+            byteSource.AddRange(bytes);
+            byteSource.AddRange(StrBytes);
+
+            byte[] Sha1Bytes = sha1.ComputeHash(byteSource.ToArray()).Skip(0).Take(16).ToArray();
+            sha1.Dispose();
+
+            //UUIDv5: [254 181 68 49 48 27 82 187 166 221 225 233 62 129 187 158]
+
+            Sha1Bytes[6] = (byte)((Sha1Bytes[6] & 0x0f) | (5 << 4));
+            Sha1Bytes[8] = (byte)(Sha1Bytes[8] & (0xff >> 2) | (0x02 << 6));
+
+            var result = BitConverter.ToString(Sha1Bytes).Replace("-", "").Insert(8, "-").Insert(13, "-").Insert(18, "-").Insert(23, "-").ToLower();
+            Console.WriteLine(result);
+            //UUIDv5: feb54431-301b-52bb-a6dd-e1e93e81bb9e
+        }
     }
 }