unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,winsock;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

type
  TaPInAddr = Array[0..10] of PInAddr;
  PaPInAddr = ^TaPInAddr;

procedure TForm1.Button1Click(Sender: TObject);
var
  phe: PHostEnt;
  pptr: PaPInAddr;
  Buffer: Array[0..63] of Char;
  I: Integer;
  GInitData: TWSAData;
  st:TstringList;
begin
    WSAStartup($101, GInitData);
    st:=TStringList.Create;
    GetHostName(Buffer, SizeOf(Buffer));
    phe := GetHostByName(buffer);
    if phe = nil then
    begin
        Exit;
    end;
    pPtr := PaPInAddr(phe^.h_addr_list);
    I := 0;
    while pPtr^[I] <> nil do
    begin
        st.Add(inet_ntoa(pptr^[I]^));
        showmessage(st.strings[i]);
        Inc(I);

    end;
    WSACleanup;
end;

end.