Allowed Class A Subnets and Host IP addresses
(Total Hosts = #of Subnets times
#of Hosts)
# bits
|
Subnet Mask
|
CIDR
|
# Subnets
|
# Hosts
|
Total Hosts
|
2
|
255.192.0.0
|
/10
|
2
|
4194302
|
8388604
|
3
|
255.224.0.0
|
/11
|
6
|
2097150
|
12582900
|
4
|
255.240.0.0
|
/12
|
14
|
1048574
|
14680036
|
5
|
255.248.0.0
|
/13
|
30
|
524286
|
15728580
|
6
|
255.252.0.0
|
/14
|
62
|
262142
|
16252804
|
7
|
255.254.0.0
|
/15
|
126
|
131070
|
16514820
|
8
|
255.255.0.0
|
/16
|
254
|
65534
|
16645636
|
9
|
255.255.128.0
|
/17
|
510
|
32766
|
16710660
|
10
|
255.255.192.0
|
/18
|
1022
|
16382
|
16742404
|
11
|
255.255.224.0
|
/19
|
2046
|
8190
|
16756740
|
12
|
255.255.240.0
|
/20
|
4094
|
4094
|
16760836
|
13
|
255.255.248.0
|
/21
|
8190
|
2046
|
16756740
|
14
|
255.255.252.0
|
/22
|
16382
|
1022
|
16742404
|
15
|
255.255.254.0
|
/23
|
32766
|
510
|
16710660
|
16
|
255.255.255.0
|
/24
|
65534
|
254
|
16645636
|
17
|
255.255.255.128
|
/25
|
131070
|
126
|
16514820
|
18
|
255.255.255.192
|
/26
|
262142
|
62
|
16252804
|
19
|
255.255.255.224
|
/27
|
524286
|
30
|
15728580
|
20
|
255.255.255.240
|
/28
|
1048574
|
14
|
14680036
|
21
|
255.255.255.248
|
/29
|
2097150
|
6
|
12582900
|
22
|
255.255.255.252
|
/30
|
4194302
|
2
|
8388604
|
Allowed Class B Subnets and Host IP addresses
(Total Hosts = #of Subnets times
#of Hosts)
# bits
|
Subnet Mask
|
CIDR
|
# Subnets
|
# Hosts
|
Total Hosts
|
2
|
255.255.192.0
|
/18
|
2
|
16382
|
32764
|
3
|
255.255.224.0
|
/19
|
6
|
8190
|
49140
|
4
|
255.255.240.0
|
/20
|
14
|
4094
|
57316
|
5
|
255.255.248.0
|
/21
|
30
|
2046
|
61380
|
6
|
255.255.252.0
|
/22
|
62
|
1022
|
63364
|
7
|
255.255.254.0
|
/23
|
126
|
510
|
64260
|
8
|
255.255.255.0
|
/24
|
254
|
254
|
64516
|
9
|
255.255.255.128
|
/25
|
510
|
126
|
64260
|
10
|
255.255.255.192
|
/26
|
1022
|
62
|
63364
|
11
|
255.255.255.224
|
/27
|
2046
|
30
|
61380
|
12
|
255.255.255.240
|
/28
|
4094
|
14
|
57316
|
13
|
255.255.255.248
|
/29
|
8190
|
6
|
49140
|
14
|
255.255.255.252
|
/30
|
16382
|
2
|
32764
|
Allowed Class C Subnets and Host IP addresses
(Total Hosts = #of Subnets times
#of Hosts)
# bits
|
Subnet Mask
|
CIDR
|
# Subnets
|
# Hosts
|
Total Hosts
|
2
|
255.255.255.192
|
/26
|
2
|
62
|
124
|
3
|
255.255.255.224
|
/27
|
6
|
30
|
180
|
4
|
255.255.255.240
|
/28
|
14
|
14
|
196
|
5
|
255.255.255.248
|
/29
|
30
|
6
|
180
|
6
|
255.255.255.252
|
/30
|
62
|
2
|
124
|
|