...das IP Address Control verwenden?

{
  Microsoft® Internet Explorer Version 4.0 introduces the IP address control,
  a new control similar to an edit control that allows the user to enter a
  numeric address in Internet protocol (IP) format.
  This format consists of four three-digit fields.
  Each field is treated individually; the field numbers are zero-based and
  proceed from left to right as shown in this figure.

  Further informations
  http://msdn.microsoft.com/library/en-us/shellcc/platform/commctls/ipaddress/ipaddress.asp
}

unit Unit1;

interface

uses
  Windows, Messages, Classes, Forms, Controls, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    IPAddress: TBevel;
    SetIP: TButton;
    ClearIP: TButton;
    procedure FormCreate(Sender: TObject);
    procedure SetIPClick(Sender: TObject);
    procedure ClearIPClick(Sender: TObject);
  private
    FIPAddress: Longint;
    HIPAddress: HWND;
    PrevWndProc: TWndMethod;
    procedure NewWindowProc(var Message: TMessage);
  public
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses
  CommCtrl;

const
  IP_ADDRESS_ID: Longword = $0100;

procedure TForm1.FormCreate(Sender: TObject);
var
  lpInitCtrls: TInitCommonControlsEx;
begin
  lpInitCtrls.dwSize := SizeOf(TInitCommonControlsEx);
  lpInitCtrls.dwICC  := ICC_INTERNET_CLASSES;
  if InitCommonControlsEx(lpInitCtrls) then 
  begin
    PrevWndProc := WindowProc;
    WindowProc  := NewWindowProc;

    HIPAddress := CreateWindowEx(WS_EX_LEFT, WC_IPADDRESS, nil,
      WS_CHILD + WS_VISIBLE + WS_BORDER + WS_TABSTOP,
      IPAddress.Left, IPAddress.Top, IPAddress.Width, IPAddress.Height,
      Handle, IP_ADDRESS_ID, HInstance, nil);
    SendMessage(HIPAddress, IPM_SETFOCUS, 0, 0);
  end;
end;

procedure TForm1.NewWindowProc(var Message: TMessage);
var
  nField: longint;
begin
  case Message.Msg of
    WM_NOTIFY: 
      begin
        if PNMHDR(Ptr(Message.lParam)).idFrom = IP_ADDRESS_ID then 
        begin
          case PNMIPAddress(ptr(Message.lParam)).hdr.code of
            IPN_FIELDCHANGED: 
              begin
                if SendMessage(HIPAddress, IPM_ISBLANK, 0, 0) = 0 then
                  SendMessage(HIPAddress, IPM_GETADDRESS, 0, lParam(LPDWORD(@FIPAddress)));
              end;
          end;
        end;
      end;
    WM_COMMAND: 
      begin
        if Message.WParamLo = IP_ADDRESS_ID then
          case Message.WParamHi of
            EN_SETFOCUS: 
              begin
                nField := SendMessage(HIPAddress, IPM_GETADDRESS, 0,
                  lParam(LPDWORD(@FIPAddress)));
                if nField = 4 then nField := 0;
                SendMessage(HIPAddress, IPM_SETFOCUS, wParam(nField), 0);
              end;
            EN_KILLFOCUS: 
              begin
                if SendMessage(HIPAddress, IPM_ISBLANK, 0, 0) = 0 then
                  SendMessage(HIPAddress, IPM_GETADDRESS, 0, lParam(LPDWORD(@FIPAddress)));
              end;
            EN_CHANGE: 
              begin
              end;
          end;
      end;
  end;
  if Assigned(PrevWndProc) then PrevWndproc(Message);
end;

procedure TForm1.SetIPClick(Sender: TObject);
begin
  FIPAddress := MAKEIPADDRESS(127, 0, 0, 1);
  SendMessage(HIPAddress, IPM_SETADDRESS, 0, lParam(DWORD(FIPAddress)));
end;

procedure TForm1.ClearIPClick(Sender: TObject);
begin
  SendMessage(HIPAddress, IPM_CLEARADDRESS, 0, 0);
end;

end.

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