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This page was last updated:
October 14, 2002
, and now I am betting you have a headache.
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Bits
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1st
Octet
|
Networks
|
Hosts
|
|
A
|
0
|
1-126
|
126
|
16,777,214
|
|
B
|
10
|
128-191
|
16,384
|
65,534
|
|
C
|
110
|
192-223
|
2,097,152
|
254
|
|
Mask:
|
-
|
192
|
224
|
240
|
248
|
252
|
254
|
255
|
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Value of bit
&
# of Supernets:
|
128
|
64
|
32
|
16
|
8
|
4
|
2
|
1
|
|
# of Subnets:
|
-
|
2
|
6
|
14
|
30
|
62
|
126
|
254
|
Binary Equivalents
|
21-2
|
0
|
29-2
|
510
|
217-2
|
131,070
|
225-2
|
33,554,430
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|
22-2
|
2
|
210-2
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1,022
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218-2
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262,142
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226-2
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67,108,862
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23-2
|
6
|
211-2
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2,046
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219-2
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524,286
|
227-2
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134,217,726
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24-2
|
14
|
212-2
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4,094
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220-2
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1,048,574
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228-2
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268,435,454
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|
25-2
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30
|
213-2
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8,190
|
221-2
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2,097,150
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229-2
|
536,870,910
|
|
26-2
|
62
|
214-2
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16,382
|
222-2
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4,194,302
|
230-2
|
1,073,741,822
|
|
27-2
|
126
|
215-2
|
32,766
|
223-2
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8,388,606
|
231-2
|
2,147,483,646
|
|
28-2
|
254
|
216-2
|
65,534
|
224-2
|
16,777,214
|
232-2
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4,294,967,294
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|
W .
|
X .
|
Y .
|
Z .
|
|
W .
|
X .
|
Y .
|
Z .
|
|
170 .
|
85 .
|
106 .
|
202 .
|
|
10101010
|
01010101
|
01101010
|
11001010
|
|
255 .
|
255 .
|
224 .
|
0 .
|
|
11111111
|
11111111
|
11100000
|
00000000
|
 Lowest high order parity bit = 32
Beginning of subnet = 96
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