Retorna o IP da Máquina

function GetIP:string;//--> Declare a Winsock na clausula uses da unit

var

  WSAData: TWSAData;

  HostEnt: PHostEnt;

  Name:string;

begin

  WSAStartup(2, WSAData);

  SetLength(Name, 255);

  Gethostname(PChar(Name), 255);

  SetLength(Name, StrLen(PChar(Name)));

  HostEnt := gethostbyname(PChar(Name));

  with HostEnt^ do

    Result:=Format('%d.%d.%d.%d',[Byte(h_addr^[0]),

              Byte(h_addr^[1]),Byte(h_addr^[2]),Byte(h_addr^[3])]);

  WSACleanup;

end;