Netmask Address Prefix Length hosts/class C'S/class B'S/class A's255.255.255.255/ +    1255.255.255.254/ to    2255.255.255.252/ -    4255.255.255.248/ in    8255.255.255.240/ -     -255.255.255.224/ -     +255.255.255.192/ -     -255.255.255.128/ -     -255.255.255.0/ -(Class C) the/1255.255.254.0/ at     +/2255.255.252.0/ A    1,024/4255.255.248.0/ +    2,048/8255.255.240.0/ -    4,096/ -255.255.224.0/ +    8,192/ +255.255.192.0/ -     -,384/ -255.255.128.0/ -     +,768/ -255.255.0.0/ -(Class B) $,536/ the/1255.254.0.0/ the    131,072/ +/2255.252.0.0/ -    262,144/1024x768/4255.248.0.0/ -    524,288/2048/8255.240.0.0/ A    1,048,576/4096/16
255.224.0.0/ One    2,097, the/8129/ +255.192.0.0/Ten    4,194,304/ -,384/ -255.128.0.0/9    8,388,608/ +,768/ -255.0.0.0/8(Class A) -,777,216/ $,536/ the/1254.0.0.0/7     -,554,432/131,072/ +/2252.0.0.0/6     the,108,864/262,144/1,024/4248.0.0.0/5    134,217,728/524,288/2,048/8240.0.0.0/4    268,435,456/1,048,576/4,096/ -224.0.0.0/3    536,870,912/2,097, the/8,192/ +192.0.0.0/2    1,073,741,824/4,194,304/ -,384/ -128.0.0.0/1    2,147,483,648/8,388,608/ +,768/ -0.0.0.0/0(The Internet)4,294,967,296/ -,777,216/ $,536/256
.
Netmask v. Address Prefix Length