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IP ADDRESSING GUIDE |
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Class A |
1-127* |
*loop back |
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Leading bits |
0 |
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Class B |
128-191 |
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10 |
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Class C |
192-223 |
|
110 |
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Class D |
224-239 |
Multicast |
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1110 |
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Class E |
240-255 |
Xperimental |
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11110 |
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Formula to determine number of subnets or
hosts created by borrowing bits from the host portion of the address |
M= number
of bits borrowed (Masked) |
U= the
number of bits remaining or not borrowed (unmasked) |
2^M= Total
number of subnets created |
2^U= Total number of hosts on each
subnet |
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2^M - 2
=Usable number of subnets created |
2^U - 2= Usable number of hosts on
each subnet |
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Class A License N.H.H.H |
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# of
bits |
Subnet mask |
total subnets |
usable subnets |
Total Hosts |
Usable Hosts |
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2 |
255.192.0.0 |
4 |
2 |
4,194,304 |
4,194,302 |
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3 |
255.224.0.0 |
8 |
6 |
2,097,152 |
2,097,150 |
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4 |
255.240.0.0 |
16 |
14 |
1,048,576 |
1,048,574 |
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5 |
255.248.0.0 |
32 |
30 |
524,288 |
524,286 |
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6 |
255.252.0.0 |
64 |
62 |
262,144 |
262,142 |
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7 |
255.254.0.0 |
128 |
126 |
131,072 |
131,070 |
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8 |
255.255.0.0 |
256 |
254 |
65,536 |
65,534 |
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9 |
255.255.128.0 |
512 |
510 |
32,768 |
32,766 |
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10 |
255.255.192.0 |
1,024 |
1,022 |
16,384 |
16,382 |
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11 |
255.255.224.0 |
2,048 |
2,046 |
8,192 |
8,190 |
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12 |
255.255.240.0 |
4,096 |
4,094 |
4,096 |
4,094 |
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13 |
255.255.248.0 |
8,192 |
8,190 |
2,048 |
2,046 |
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14 |
255.255.252.0 |
16,384 |
16,382 |
1,024 |
1,022 |
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15 |
255.255.254.0 |
32,768 |
32,766 |
512 |
510 |
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16 |
255.255.255.0 |
65,536 |
65,534 |
256 |
254 |
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17 |
255.255.255.128 |
131,072 |
131,070 |
128 |
126 |
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18 |
255.255.255.192 |
262,144 |
262,142 |
64 |
62 |
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19 |
255.255.255.224 |
524,288 |
524,286 |
32 |
30 |
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20 |
255.255.255.240 |
1,048,576 |
1,048,574 |
16 |
14 |
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21 |
255.255.255.248 |
2,097,152 |
2,097,150 |
8 |
6 |
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22 |
255.255.255.252 |
4,194,304 |
4,194,302 |
4 |
2 |
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Class
B Liscense N.N.H.H |
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# of
bits |
Subnet mask |
total subnets |
usable subnets |
Total Hosts |
Usable Hosts |
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2 |
255.255.192.0 |
4 |
2 |
16,384 |
16,382 |
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3 |
255.255.224.0 |
8 |
6 |
8,192 |
8,190 |
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4 |
255.255.240.0 |
16 |
14 |
4,096 |
4,094 |
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5 |
255.255.248.0 |
32 |
30 |
2,048 |
2,046 |
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6 |
255.255.252.0 |
64 |
62 |
1,024 |
1,022 |
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7 |
255.255.254.0 |
128 |
126 |
512 |
510 |
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8 |
255.255.255.0 |
256 |
254 |
256 |
254 |
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9 |
255.255.255.128 |
512 |
510 |
128 |
126 |
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10 |
255.255.255.192 |
1,024 |
1,022 |
64 |
62 |
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11 |
255.255.255.224 |
2,048 |
2,046 |
32 |
30 |
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12 |
255.255.255.240 |
4,096 |
4,094 |
16 |
14 |
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13 |
255.255.255.248 |
8,192 |
8,190 |
8 |
6 |
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14 |
255.255.255.252 |
16,384 |
16,382 |
4 |
2 |
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Class C License N.N.N.H |
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# of
bits |
Subnet mask |
total subnets |
usable subnets |
Total Hosts |
Usable Hosts |
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2 |
255.255.255.192 |
4 |
2 |
64 |
62 |
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3 |
255.255.255.224 |
8 |
6 |
32 |
30 |
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4 |
255.255.255.240 |
16 |
14 |
16 |
14 |
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5 |
255.255.255.248 |
32 |
30 |
8 |
6 |
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6 |
255.255.255.252 |
64 |
62 |
4 |
2 |
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