I always forget this stuff. I'm a programmer not a network guy so I don't really try to remember this stuff. So now you don't either, bookmark this page and you'll always know what the hell a slash twenty four is.
CIDR Dotted Networks Number of
Notation Decimal Available IP's
----------------------------------------------------------------------
/32 255.255.255.255 1/256 Class C 1
/31 255.255.255.254 1/128 Class C 2
/30 255.255.255.252 1/64 Class C 4
/29 255.255.255.248 1/32 Class C 8
/28 255.255.255.240 1/16 Class C 16
/27 255.255.255.224 1/8 Class C 32
/26 255.255.255.192 1/4 Class C 64
/25 255.255.255.128 1/2 Class C 128
/24 255.255.255.0 1 Class C 256
