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uses Winsock;

function LookupName(const Name: string): TInAddr;
var
  HostEnt: PHostEnt;
  InAddr: TInAddr;
begin
  HostEnt := gethostbyname(PChar(Name));
  FillChar(InAddr, SizeOf(InAddr), 0);
  if HostEnt <> nil then
  begin
    with InAddr, HostEnt^ do
    begin
      S_un_b.s_b1 := h_addr^[0];
      S_un_b.s_b2 := h_addr^[1];
      S_un_b.s_b3 := h_addr^[2];
      S_un_b.s_b4 := h_addr^[3];
    end;
  end;
  Result := InAddr;
end;

function GetHostIP(HostName: String): String;
var
  InAddr: TInAddr;
begin
  InAddr := LookupName(HostName);
  with InAddr.S_un_b do
    Result := inttostr(Ord(s_b1))+'.'+inttostr(Ord(s_b2))+'.'+inttostr(Ord(s_b3))+'.'+inttostr(Ord(s_b4));
end;