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Class A Network |
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Class A Formulas:
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IP Address:xxx.yyy.zzz.vvv
where the First Octet Range xxx's is: 1 - 126.
and the other's Octet Range xxx or yyy or zzz is: 0 - 255
xxx : Network
yyy.zzz.vvv Hosts
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Definitions:
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Mask : One of the elemnts of the following array:
In decimal: [M] = {128, 192, 224, 240, 248, 252, 254, 255}
In binary: [M] = {10000000, 11000000, 11100000, 11110000, 11111000, 11111100, 11111110, 1111111}
Subnet Bits = the number of 1 in binary's representation of the Mask
Subnet Mask: 255.m.0.0 and 255.255.m.0 and 255.255.255.m (m belongs to [M])
Max Subnet = 2Subnet Bits
Number of Hosts = (256 - Mask) x 256 x 256 - 2
- 2 stands for that we reseve the first and the last host addresses: The first is called
Subnet ID, the second Broadcast Address
Subnet ID = xxx.0.0.0
Broadcast Address: xxx.(255 - Mask).(255 - Mask).(255 - Mask)
Wildcard Mask:
0.0.(255 - Mask).255
Host Address Range:
xxx.0.0.1 - xxx.(255 - Mask).(255 - Mask).(255 - Mask)
Calss A:
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We mask as follow:
Subnet Mask
0 255.0.0.0
1 255.128.0.0
2 255.192.0.0
3 255.224.0.0
4 255.240.0.0
5 255.248.0.0
6 255.252.0.0
7 255.254.0.0
8 255.255.0.0
9 255.255.128.0
10 255.255.192.0
11 255.255.224.0
12 255.255.240.0
13 255.255.248.0
14 255.255.252.0
15 255.255.254.0
16 255.255.255.0
17 255.255.255.128
18 255.255.255.192
19 255.255.255.224
20 255.255.255.240
21 255.255.255.248
22 255.255.255.252
23 255.255.255.255
We vary xxx and fix yyy.zzz to 0.0 (from 0 - 7)
We vary yyy and fix xxx and zzz to 255 and 000 (from 8 - 15)
We vary zzz and fix xxx.yyy to 255.255 (from 16 - 23)
(From 0 to 7)
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Wildcard Mask: 0.(255 - Mask).255.255
Broadcast Address: 12.(255 - Mask).255.255
Hosts: (256 - Mask) x 256 x 256 - 2
Host Address Range: 12.0.0.1 - 12.(255 - Mask).255.254
(From 8 to 15)
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Wildcard Mask: 0.255.(255 - Mask).255
Broadcast Address: 12.255.(255 - Mask).255
Hosts: (256 - Mask) x 256 - 2
Host Address Range: 12.0.0.1 - 12.255.(255 - Mask).254
(From 16 to 23)
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Wildcard Mask: 0.255.255.(255 - Mask)
Broadcast Address: 12.255.255.(255 - Mask)
Hosts: (256 - Mask) - 2
Host Address Range: 12.0.0.1 - 12.255.255.(255 - Mask)
Table:
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Subnet Mask Subnet Max
Bits Subnet Hosts
0 255.0.0.0 0 1 256 x 256 x 256 - 2 = 16,777,214
1 255.128.0.0 1 2 128 x 256 x 256 - 2 = 8,388,606
2 255.192.0.0 2 4 64 x 256 x 256 - 2 = 4,194,302
3 255.224.0.0 3 8 32 x 256 x 256 - 2 = 2,097,150
4 255.240.0.0 4 16 16 x 256 x 256 - 2 = 1,048,574
5 255.248.0.0 5 32 8 x 256 x 256 - 2 = 524,286
6 255.252.0.0 6 64 4 x 256 x 256 - 2 = 262,142
7 255.254.0.0 7 128 2 x 256 x 256 - 2 = 131,070
8 255.255.0.0 8 256 256 x 256 - 2 = 65,534
9 255.255.128.0 9 512 128 x 256 - 2 = 32,766
10 255.255.192.0 10 1024 64 x 256 - 2 = 16,382
11 255.255.224.0 11 2048 32 x 256 - 2 = 8,190
12 255.255.240.0 12 4096 16 x 256 - 2 = 4,094
13 255.255.248.0 13 8192 8 x 256 - 2 = 2,046
14 255.255.252.0 14 16384 4 x 256 - 2 = 1,022
15 255.255.254.0 15 32768 2 x 256 - 2 = 510
16 255.255.255.0 16 65536 256 - 2 = 254
17 255.255.255.128 17 131072 128 - 2 = 126
18 255.255.255.192 18 262144 64 - 2 = 62
19 255.255.255.224 19 524288 32 - 2 = 30
20 255.255.255.240 20 1048576 16 - 2 = 14
21 255.255.255.248 21 2097152 8 - 2 = 6
22 255.255.255.252 22 4194304 4 - 2 = 2
23 255.255.255.255 23 8388608 2 - 2 = 0
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Subnet ID Example: 12.0.0.0
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(From 0 to 7)
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Wildcard Mask: 0.(255 - Mask).255.255
Broadcast Address: 12.(255 - Mask).255.255
Host Address Range: 12.0.0.1 - 12.(255 - Mask).255.255
Broadcast Address: 12.255.255.255
0 + 255 = 255
Wildcard Mask: 0.255.255.255
12.0.0.1 - 12.255.255.254
Broadcast Address: 12.127.255.255
128 + 127 = 255
Wildcard Mask: 0.127.255.255
Host Address Range 12.0.0.1 - 12.127.255.254
Broadcast Address: 12.63.255.255
192 + 63 = 255
Wildcard Mask: 0.63.255.255
Host Address Range: 12.0.0.1 - 12.63.255.254
Broadcast Address: 12.31.255.255
224 + 31 = 255
Wildcard Mask: 0.63.255.255
Host Address Range12.0.0.1 - 12.31.255.254
Broadcast Address: 12.15.255.255
240 + 15 = 255
Wildcard Mask: 0.63.255.255
Host Address Range12.0.0.1 - 12.15.255.254
Broadcast Address: 12.7.255.255
248 + 7 = 255
Wildcard Mask: 0.7.255.255
Host Address Range12.0.0.1 - 12.7.255.254
Broadcast Address: 12.3.255.255
252 + 3 = 255
Wildcard Mask: 0.3.255.255
Host Address Range12.0.0.1 - 12.3.255.254
Broadcast Address: 12.1.255.255
254 + 1 = 255
Wildcard Mask: 0.1.255.255
Host Address Range12.0.0.1 - 12.1.255.254
(From 8 to 15)
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Wildcard Mask: 0.0.(255 - Mask).255
Broadcast Address: 12.0.(255 - Mask).255
Host Address Range: 12.0.0.1 - 12.0.(255 - Mask).255
Mask : 0
Wildcard Mask: 0.0.255.255
Broadcast Address: 12.0.255.255
Host Address Range: 12.0.0.1 - 12.0.255.254
Mask : 128
Wildcard Mask: 0.0.127.255
Broadcast Address: 12.0.127.255
Host Address Range: 12.0.0.1 - 12.0.127.254
Mask : 192
Wildcard Mask: 0.0.63.255
Broadcast Address: 12.0.63.255
Host Address Range: 12.0.0.1 - 12.0.63.254
Mask : 224
Wildcard Mask: 0.0.31.255
Broadcast Address: 12.0.31.255
Host Address Range: 12.0.0.1 - 12.0.31.254
Mask : 240
Wildcard Mask: 0.0.15.255
Broadcast Address: 12.0.15.255
Host Address Range: 12.0.0.1 - 12.0.15.254
Mask : 248
Wildcard Mask: 0.0.7.255
Broadcast Address: 12.0.7.255
Host Address Range: 12.0.0.1 - 12.0.7.254
Mask : 252
Wildcard Mask: 0.0.3.255
Broadcast Address: 12.0.3.255
Host Address Range: 12.0.0.1 - 12.0.3.2554
Mask : 254
Wildcard Mask: 0.0.1.255
Broadcast Address: 12.255.1.255
Host Address Range: 12.0.0.1 - 12.255.1.254
Mask : 255
Wildcard Mask: 0.0.0.255
Broadcast Address: 12.255.0.255
Host Address Range: 12.0.0.1 - 12.255.0.254
(From 16 to 23)
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Wildcard Mask: 0.0.0.(255 - Mask)
Broadcast Address: 12.0.0.(255 - Mask)
Host Address Range: 12.0.0.1 - 12.0.0.(255 - Mask)
Mask: 0
Wildcard Mask: 0.0.0.255
Broadcast Address: 12.0.0.255
Host Address Range: 12.0.0.1 - 12.0.0.254
Mask: 128
Wildcard Mask: 0.0.0.127
Broadcast Address: 12.0.0.127
Host Address Range: 12.0.0.1 - 12.0.0.126
Mask: 192
Wildcard Mask: 0.0.0.63
Broadcast Address: 12.0.0.63
Host Address Range: 12.0.0.1 - 12.0.0.62
Mask: 224
Wildcard Mask: 0.0.0.31
Broadcast Address: 12.0.0.31
Host Address Range: 12.0.0.1 - 12.0.0.30
Mask: 240
Wildcard Mask: 0.0.0.15
Broadcast Address: 12.0.0.15
Host Address Range: 12.0.0.1 - 12.0.0.14
Mask: 248
Wildcard Mask: 0.0.0.7
Broadcast Address: 12.0.0.7
Host Address Range: 12.0.0.1 - 12.0.0.6
Mask: 252
Wildcard Mask: 0.0.0.3
Broadcast Address: 12.0.0.3
Host Address Range: 12.0.0.1 - 12.0.0.2
Mask: 254
Wildcard Mask: 0.0.0.1
Broadcast Address: 12.0.0.1
Host Address Range: 12.0.0.1 - 12.0.0.0
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