Appendix B IP Addresses and Subnetting
Subnet Planning
The following table is a summary for subnet planning on a network with a
Table 124
NO. “BORROWED” | SUBNET MASK | NO. SUBNETS | NO. HOSTS PER |
HOST BITS |
|
| SUBNET |
1 | 255.255.255.128 (/25) | 2 | 126 |
|
|
|
|
2 | 255.255.255.192 (/26) | 4 | 62 |
|
|
|
|
3 | 255.255.255.224 (/27) | 8 | 30 |
|
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|
|
4 | 255.255.255.240 (/28) | 16 | 14 |
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|
|
5 | 255.255.255.248 (/29) | 32 | 6 |
|
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|
|
6 | 255.255.255.252 (/30) | 64 | 2 |
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7 | 255.255.255.254 (/31) | 128 | 1 |
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|
The following table is a summary for subnet planning on a network with a
Table 125
NO. “BORROWED” | SUBNET MASK | NO. SUBNETS | NO. HOSTS PER |
HOST BITS |
|
| SUBNET |
1 | 255.255.128.0 (/17) | 2 | 32766 |
|
|
|
|
2 | 255.255.192.0 (/18) | 4 | 16382 |
|
|
|
|
3 | 255.255.224.0 (/19) | 8 | 8190 |
|
|
|
|
4 | 255.255.240.0 (/20) | 16 | 4094 |
|
|
|
|
5 | 255.255.248.0 (/21) | 32 | 2046 |
|
|
|
|
6 | 255.255.252.0 (/22) | 64 | 1022 |
|
|
|
|
7 | 255.255.254.0 (/23) | 128 | 510 |
|
|
|
|
8 | 255.255.255.0 (/24) | 256 | 254 |
|
|
|
|
9 | 255.255.255.128 (/25) | 512 | 126 |
|
|
|
|
10 | 255.255.255.192 (/26) | 1024 | 62 |
|
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|
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11 | 255.255.255.224 (/27) | 2048 | 30 |
|
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|
|
12 | 255.255.255.240 (/28) | 4096 | 14 |
|
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|
|
13 | 255.255.255.248 (/29) | 8192 | 6 |
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|
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14 | 255.255.255.252 (/30) | 16384 | 2 |
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15 | 255.255.255.254 (/31) | 32768 | 1 |
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Configuring IP Addresses
Where you obtain your network number depends on your particular situation. If the ISP or your network administrator assigns you a block of registered IP
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