... 255 .0.0.0B w.x.0.0 128–191 16,384 65, 534 255 . 255 .0.0C w.x.y.0 192–223 2,097, 152 254 255 . 255 . 255 .0D N/A 224–239 N/A N/A N/AE N/A 240– 255 N/A N/A N/A!1 3-4 312. Click Add to add the third DNS ... 10. 255 . 255 . 255 ■ Class B: 172.16.0.0 through 172.31. 255 . 255 ■ Class C: 192.168.0.0 through 192.168. 255 . 255 You can choose whichever range you like to use for your network and implement cus-tom ... value 255 or the minimum value 0. The four numbers are then arranged ascontiguous octets of 255 , followed by contiguous octets of 0. For example, 255 . 255 .0.0is a valid subnet mask, whereas 255 .0. 255 .0...