function GetComputerNane(IPAddr: string): string;
var
  SockAddrIn: TSockAddrIn;
  HostEnt: PHostEnt;
  WSAData: TWSAData;
begin
  WSAStartup($101, WSAData);
  SockAddrIn.sin_addr.s_addr := inet_addr(PChar(IPAddr));
  HostEnt:= GetHostByAddr(@SockAddrIn.sin_addr.S_addr, 4, AF_INET);
  if HostEnt <> nil then
    Result := StrPas(Hostent^.h_name)
  else
    Result := '';
  end;
end;

function GetIp(ComputerName: string): string;
var
  TMPResult: string;
  WSA: TWSAData;
  H: PHostEnt;
  P: PChar;
begin
  if WSAStartUp($101, WSA) = 0 then
  begin
    GetMem(P, 255 + 1);
    StrPCopy(P, ComputerName);
    H := GetHostByName(P);
    FreeMem(P);
    if H <> nil then
    begin
      P := inet_ntoa(PInAddr(H^.h_addr_list^)^);
      TMPResult := StrPas(P);
    end;
    WSACleanUp;
    if TMPResult <> '' then
      Result := TMPResult;
    else
      Result := '0';
    end;
  end;
end;