CIDR Total number Network
Description:
Notation:
of addresses:
Mask:
--------------------------------------------------------------
/0
4,294,967,296 0.0.0.0
Every Address
/1
2,147,483,648 128.0.0.0
128 /8 nets
/2
1,073,741,824 192.0.0.0 64
/8 nets
/3 536,870,912
224.0.0.0 32 /8 nets
/4
268,435,456 240.0.0.0
16 /8 nets
/5
134,217,728 248.0.0.0
8 /8 nets
/6
67,108,864 252.0.0.0
4 /8 nets
/7 33,554,432
254.0.0.0 2 /8
nets
/8 16,777,214
255.0.0.0 1 /8
net
--------------------------------------------------------------
/9
8,388,608
255.128.0.0 128 /16 nets
/10
4,194,304
255.192.0.0 64 /16 nets
/11
2,097,152
255.224.0.0 32 /16 nets
/12
1,048,576
255.240.0.0 16 /16 nets
/13
524,288
255.248.0.0 8 /16 nets
/14
262,144
255.252.0.0 4 /16 nets
/15
131.072
255.254.0.0 2 /16 nets
/16
65,536
255.255.0.0 1
/16
--------------------------------------------------------------
/17
32,768
255.255.128.0 128 /24 nets
/19
16,384
255.255.192.0 64 /24 nets
/19
8,192 255.255.224.0
32 /24 nets
/20
4,096 255.255.240.0
16 /24 nets
/21 2,048
255.255.248.0 8
/24 nets
/22 1,024
255.255.252.0 4 /24
nets
/23 512
255.255.254.0 2 /24
nets
/24 256
255.255.255.0 1
/24
--------------------------------------------------------------
/25
128
255.255.255.128 Half of a /24
/26
64
255.255.255.192 Fourth of a /24
/27
32
255.255.255.224 Eighth of a /24
/28
16
255.255.255.240 1/16th of a /24
/29
8
255.255.255.248 5 Usable addresses
/30
4
255.255.255.252 1 Usable address
/31
2
255.255.255.254 Unusable
/32
1
255.255.255.255 Single
host
--------------------------------------------------------------
[Via (Is it
even a box?)]
I've needed this a few times myself...thanks, Paul.