|
CIDR Prefix
|
Netmask
|
Binary
|
Number of Networks
|
|---|
|
/1
|
128.0.0.0
|
10000000000000000000000000000000
|
128 Class A domains
|
|
/2
|
192.0.0.0
|
11000000000000000000000000000000
|
64 Class A domains
|
|
/3
|
224.0.0.0
|
11100000000000000000000000000000
|
32 Class A domains
|
|
/4
|
240.0.0.0
|
11110000000000000000000000000000
|
16 Class A domains
|
|
/5
|
248.0.0.0
|
11111000000000000000000000000000
|
8 Class A domains
|
|
/6
|
252.0.0.0
|
11111100000000000000000000000000
|
4 Class A domains
|
|
/7
|
254.0.0.0
|
11111110000000000000000000000000
|
2 Class A domains
|
|
/8
|
255.0.0.0
|
11111111000000000000000000000000
|
1 Class A domain
|
|
/9
|
255.128.0.0
|
11111111100000000000000000000000
|
128 Class B domains
|
|
/10
|
255.192.0.0
|
11111111110000000000000000000000
|
64 Class B domains
|
|
/11
|
255.224.0.0
|
11111111111000000000000000000000
|
32 Class B domains
|
|
/12
|
255.240.0.0
|
11111111111100000000000000000000
|
16 Class B domains
|
|
/13
|
255.248.0.0
|
11111111111110000000000000000000
|
8 Class B domains
|
|
/14
|
255.252.0.0
|
11111111111111000000000000000000
|
4 Class B domains
|
|
/15
|
255.254.0.0
|
11111111111111100000000000000000
|
2 Class B domains
|
|
/16
|
255.255.0.0
|
11111111111111110000000000000000
|
1 Class B domain
|
|
/17
|
255.255.128.0
|
11111111111111111000000000000000
|
128 Class C domains
|
|
/18
|
255.255.192.0
|
11111111111111111100000000000000
|
64 Class C domains
|
|
/19
|
255.255.224.0
|
11111111111111111110000000000000
|
32 Class C domains
|
|
/20
|
255.255.240.0
|
11111111111111111111000000000000
|
16 Class C domains
|
|
/21
|
255.255.248.0
|
11111111111111111111100000000000
|
8 Class C domains
|
|
/22
|
255.255.252.0
|
11111111111111111111110000000000
|
4 Class C domains
|
|
/23
|
255.255.254.0
|
11111111111111111111111000000000
|
2 Class C domains
|
|
/24
|
255.255.255.0
|
11111111111111111111111100000000
|
1 Class C domain
|
|
/25
|
255.255.255.128
|
11111111111111111111111110000000
|
128 hosts
|
|
/26
|
255.255.255.192
|
11111111111111111111111111000000
|
64 hosts
|
|
/27
|
255.255.255.224
|
11111111111111111111111111100000
|
32 hosts
|
|
/28
|
255.255.255.240
|
11111111111111111111111111110000
|
16 hosts
|
|
/29
|
255.255.255.248
|
11111111111111111111111111111000
|
8 hosts
|
|
/30
|
255.255.255.252
|
11111111111111111111111111111100
|
4 hosts
|
|
/31
|
255.255.255.254
|
11111111111111111111111111111110
|
2 hosts
|
|
/32
|
255.255.255.255
|
11111111111111111111111111111111
|
1 host
|
