The following table shows class C IP address last octet values for each subnet.
Table 94 | Eight Subnets |
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SUBNET |
| SUBNET ADDRESS | FIRST ADDRESS | LAST ADDRESS | BROADCAST |
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1 |
| 0 | 1 | 30 | 31 |
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2 |
| 32 | 33 | 62 | 63 |
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3 |
| 64 | 65 | 94 | 95 |
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4 |
| 96 | 97 | 126 | 127 |
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5 |
| 128 | 129 | 158 | 159 |
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6 |
| 160 | 161 | 190 | 191 |
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7 |
| 192 | 193 | 222 | 223 |
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8 |
| 224 | 225 | 254 | 255 |
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The following table is a summary for class “C” subnet planning.
Table 95 Class C Subnet Planning
NO. “BORROWED” HOST | SUBNET MASK | NO. SUBNETS | NO. HOSTS PER | |
BITS | SUBNET | |||
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1 | 255.255.255.128 (/25) | 2 | 126 | |
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2 | 255.255.255.192 (/26) | 4 | 62 | |
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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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Subnetting With Class A and Class B Networks.
For class “A” and class “B” addresses the subnet mask also determines which bits are part of the network number and which are part of the host ID.
A class “B” address has two host ID octets available for subnetting and a class “A” address has three host ID octets (see Table 83 on page 296) available for subnetting.
Appendix B IP Addresses and Subnetting | 301 |