Row span is not working as i expected

I want to achieve this

and i did these with tag but only col span is working correctly

            <tr>
                <td><input type="checkbox"></td>
                <td>hu043</td>
                <td>7903</td>
                <td>90df78</td> 
              </tr>
            <tr>

            <tr>

                <td colspan="4" rowspan="4">&nbsp;</td>

            </tr>