diff --git a/labs/IdTest/.gitignore b/labs/IdTest/.gitignore
new file mode 100644
index 00000000..988994ff
--- /dev/null
+++ b/labs/IdTest/.gitignore
@@ -0,0 +1,16 @@
+*.bak
+*.suo
+*.db
+*.user
+.vs
+obj
+Obj
+bin
+Bin
+debug
+Debug
+release
+Release
+Logs
+logs
+node_modules
\ No newline at end of file
diff --git a/labs/IdTest/IdTest.csproj b/labs/IdTest/IdTest.csproj
new file mode 100644
index 00000000..1f36f2b0
--- /dev/null
+++ b/labs/IdTest/IdTest.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Management" Version="4.7.0" />
+  </ItemGroup>
+
+</Project>
diff --git a/labs/IdTest/IdTest.sln b/labs/IdTest/IdTest.sln
new file mode 100644
index 00000000..8d016228
--- /dev/null
+++ b/labs/IdTest/IdTest.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29806.167
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IdTest", "IdTest.csproj", "{600B4FE6-FE66-4D0B-B8EB-61642AC0A595}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{600B4FE6-FE66-4D0B-B8EB-61642AC0A595}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{600B4FE6-FE66-4D0B-B8EB-61642AC0A595}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{600B4FE6-FE66-4D0B-B8EB-61642AC0A595}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{600B4FE6-FE66-4D0B-B8EB-61642AC0A595}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {79316E84-1766-4980-B4FE-09AA33D9C00C}
+	EndGlobalSection
+EndGlobal
diff --git a/labs/IdTest/Program.cs b/labs/IdTest/Program.cs
new file mode 100644
index 00000000..cbb5bb39
--- /dev/null
+++ b/labs/IdTest/Program.cs
@@ -0,0 +1,40 @@
+using System;
+using System.IO;
+using System.Management;
+using System.Runtime.InteropServices;
+using System.Text.RegularExpressions;
+
+namespace IdTest
+{
+    internal class Program
+    {
+        private static void Main(string[] args)
+        {
+            Console.WriteLine(GetCPUNumber());
+        }
+
+        public static string GetCPUNumber()
+        {
+            var result = string.Empty;
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                result = Regex.Match(File.ReadAllText("/proc/cpuinfo"), @"Serial\s*:\s*([^\s]+)").Groups[1].Value;
+            }
+            else
+            {
+                var mc = new ManagementClass("win32_processor");
+                var moc = mc.GetInstances();
+
+                foreach (ManagementObject mo in moc)
+                {
+                    if (result == "")
+                    {
+                        result = mo.Properties["processorID"].Value.ToString();
+                        break;
+                    }
+                }
+            }
+            return result.ToLower();
+        }
+    }
+}
\ No newline at end of file
diff --git a/projects/IoTNode/Startup.cs b/projects/IoTNode/Startup.cs
index 9ecdda3d..0771da76 100644
--- a/projects/IoTNode/Startup.cs
+++ b/projects/IoTNode/Startup.cs
@@ -66,18 +66,18 @@ namespace IoTNode
             });
         }
 
-        public override void Seed(DbContext dbContext, IServiceProvider serviceProvider, IConfiguration configuration)
+        public override void Seed(DbContext dbContext, IServiceProvider serviceProvider, IConfiguration cfg)
         {
-            var id = Helper.Instance.GetMacAddress();
+            var sn = cfg["sn"];
             dbContext.Set<Node>().Add(new Node
             {
-                Id = $"nodeid-{id}".ToGuid(),
+                Id = $"nodeid-{sn}".ToGuid(),
                 Name = "½Úµã",
-                Number = id,
+                Number = sn,
                 Image = "/images/classroom.png"
             });
             dbContext.SaveChanges();
-            base.Seed(dbContext, serviceProvider, configuration);
+            base.Seed(dbContext, serviceProvider, cfg);
         }
     }
 }
\ No newline at end of file