diff --git a/X86Disassembler/X86/Handlers/Group5/CallRm32Handler.cs b/X86Disassembler/X86/Handlers/Call/CallRm32Handler.cs
similarity index 100%
rename from X86Disassembler/X86/Handlers/Group5/CallRm32Handler.cs
rename to X86Disassembler/X86/Handlers/Call/CallRm32Handler.cs
diff --git a/X86Disassembler/X86/Handlers/Inc/IncRegHandler.cs b/X86Disassembler/X86/Handlers/Inc/IncRegHandler.cs
new file mode 100644
index 0000000..a0bd949
--- /dev/null
+++ b/X86Disassembler/X86/Handlers/Inc/IncRegHandler.cs
@@ -0,0 +1,49 @@
+namespace X86Disassembler.X86.Handlers.Inc;
+
+/// <summary>
+/// Handler for INC r32 instructions (0x40-0x47)
+/// </summary>
+public class IncRegHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the IncRegHandler class
+    /// </summary>
+    /// <param name="codeBuffer">The buffer containing the code to decode</param>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    /// <param name="length">The length of the buffer</param>
+    public IncRegHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
+        : base(codeBuffer, decoder, length)
+    {
+    }
+
+    /// <summary>
+    /// Checks if this handler can decode the given opcode
+    /// </summary>
+    /// <param name="opcode">The opcode to check</param>
+    /// <returns>True if this handler can decode the opcode</returns>
+    public override bool CanHandle(byte opcode)
+    {
+        // INC EAX = 0x40, INC ECX = 0x41, ..., INC EDI = 0x47
+        return opcode >= 0x40 && opcode <= 0x47;
+    }
+
+    /// <summary>
+    /// Decodes an INC r32 instruction
+    /// </summary>
+    /// <param name="opcode">The opcode of the instruction</param>
+    /// <param name="instruction">The instruction object to populate</param>
+    /// <returns>True if the instruction was successfully decoded</returns>
+    public override bool Decode(byte opcode, Instruction instruction)
+    {
+        // Calculate the register index (0 for EAX, 1 for ECX, etc.)
+        byte reg = (byte)(opcode - 0x40);
+        
+        // Set the mnemonic
+        instruction.Mnemonic = "inc";
+        
+        // Set the operand (register name)
+        instruction.Operands = GetRegister32(reg);
+        
+        return true;
+    }
+}
diff --git a/X86Disassembler/X86/Handlers/InstructionHandlerFactory.cs b/X86Disassembler/X86/Handlers/InstructionHandlerFactory.cs
index 7cc3169..4f66009 100644
--- a/X86Disassembler/X86/Handlers/InstructionHandlerFactory.cs
+++ b/X86Disassembler/X86/Handlers/InstructionHandlerFactory.cs
@@ -5,7 +5,7 @@ using X86Disassembler.X86.Handlers.Call;
 using X86Disassembler.X86.Handlers.Cmp;
 using X86Disassembler.X86.Handlers.Dec;
 using X86Disassembler.X86.Handlers.FloatingPoint;
-using X86Disassembler.X86.Handlers.Group5;
+using X86Disassembler.X86.Handlers.Inc;
 using X86Disassembler.X86.Handlers.Jump;
 using X86Disassembler.X86.Handlers.Lea;
 using X86Disassembler.X86.Handlers.Mov;
@@ -83,12 +83,12 @@ public class InstructionHandlerFactory
         // Register Dec handlers
         RegisterDecHandlers();
         
+        // Register Inc handlers
+        RegisterIncHandlers();
+        
         // Register Add handlers
         RegisterAddHandlers();
         
-        // Register Group5 handlers
-        RegisterGroup5Handlers();
-        
         // Register Data Transfer handlers
         RegisterDataTransferHandlers();
         
@@ -172,6 +172,7 @@ public class InstructionHandlerFactory
     {
         // Add Call handlers
         _handlers.Add(new CallRel32Handler(_codeBuffer, _decoder, _length));
+        _handlers.Add(new CallRm32Handler(_codeBuffer, _decoder, _length));
     }
     
     /// <summary>
@@ -259,25 +260,25 @@ public class InstructionHandlerFactory
         _handlers.Add(new DecRegHandler(_codeBuffer, _decoder, _length));
     }
     
+    /// <summary>
+    /// Registers all Inc instruction handlers
+    /// </summary>
+    private void RegisterIncHandlers()
+    {
+        // Add Inc handlers
+        _handlers.Add(new IncRegHandler(_codeBuffer, _decoder, _length));
+    }
+    
     /// <summary>
     /// Registers all Add instruction handlers
     /// </summary>
     private void RegisterAddHandlers()
     {
-        // Add Add handlers
+        // Add ADD handlers
         _handlers.Add(new AddR32Rm32Handler(_codeBuffer, _decoder, _length));
         _handlers.Add(new AddRm32R32Handler(_codeBuffer, _decoder, _length));
     }
     
-    /// <summary>
-    /// Registers all Group5 instruction handlers
-    /// </summary>
-    private void RegisterGroup5Handlers()
-    {
-        // Add Group5 handlers
-        _handlers.Add(new CallRm32Handler(_codeBuffer, _decoder, _length));
-    }
-    
     /// <summary>
     /// Registers all Data Transfer instruction handlers
     /// </summary>
diff --git a/X86Disassembler/X86/OpcodeMap.cs b/X86Disassembler/X86/OpcodeMap.cs
index 628957b..a157e70 100644
--- a/X86Disassembler/X86/OpcodeMap.cs
+++ b/X86Disassembler/X86/OpcodeMap.cs
@@ -72,6 +72,16 @@ public static class OpcodeMap
         OneByteOpcodes[0x4E] = "dec"; // DEC ESI
         OneByteOpcodes[0x4F] = "dec"; // DEC EDI
         
+        // INC instructions
+        OneByteOpcodes[0x40] = "inc"; // INC EAX
+        OneByteOpcodes[0x41] = "inc"; // INC ECX
+        OneByteOpcodes[0x42] = "inc"; // INC EDX
+        OneByteOpcodes[0x43] = "inc"; // INC EBX
+        OneByteOpcodes[0x44] = "inc"; // INC ESP
+        OneByteOpcodes[0x45] = "inc"; // INC EBP
+        OneByteOpcodes[0x46] = "inc"; // INC ESI
+        OneByteOpcodes[0x47] = "inc"; // INC EDI
+        
         // ADD instructions
         OneByteOpcodes[0x00] = "add"; // ADD r/m8, r8
         OneByteOpcodes[0x01] = "add"; // ADD r/m32, r32
diff --git a/X86DisassemblerTests/IncInstructionTests.cs b/X86DisassemblerTests/IncInstructionTests.cs
new file mode 100644
index 0000000..e56e28c
--- /dev/null
+++ b/X86DisassemblerTests/IncInstructionTests.cs
@@ -0,0 +1,68 @@
+namespace X86DisassemblerTests;
+
+using System;
+using Xunit;
+using X86Disassembler.X86;
+
+/// <summary>
+/// Tests for INC instruction handlers
+/// </summary>
+public class IncInstructionTests
+{
+    /// <summary>
+    /// Tests the INC EAX instruction (0x40)
+    /// </summary>
+    [Fact]
+    public void TestIncEax()
+    {
+        // Arrange
+        byte[] code = { 0x40 }; // INC EAX
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("inc", instructions[0].Mnemonic);
+        Assert.Equal("eax", instructions[0].Operands);
+    }
+    
+    /// <summary>
+    /// Tests the INC ECX instruction (0x41)
+    /// </summary>
+    [Fact]
+    public void TestIncEcx()
+    {
+        // Arrange
+        byte[] code = { 0x41 }; // INC ECX
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("inc", instructions[0].Mnemonic);
+        Assert.Equal("ecx", instructions[0].Operands);
+    }
+    
+    /// <summary>
+    /// Tests the INC EDI instruction (0x47)
+    /// </summary>
+    [Fact]
+    public void TestIncEdi()
+    {
+        // Arrange
+        byte[] code = { 0x47 }; // INC EDI
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("inc", instructions[0].Mnemonic);
+        Assert.Equal("edi", instructions[0].Operands);
+    }
+}