Appendix B IP Addresses and Subnetting
Subnet Planning
The following table is a summary for subnet planning on a network with a
Table 107
NO. “BORROWED” | SUBNET MASK | NO. SUBNETS | NO. HOSTS PER | |
HOST 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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The following table is a summary for subnet planning on a network with a
Table 108
NO. “BORROWED” | SUBNET MASK | NO. SUBNETS | NO. HOSTS PER | |
HOST BITS | SUBNET | |||
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1 | 255.255.128.0 (/17) | 2 | 32766 | |
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2 | 255.255.192.0 (/18) | 4 | 16382 | |
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3 | 255.255.224.0 (/19) | 8 | 8190 | |
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4 | 255.255.240.0 (/20) | 16 | 4094 | |
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5 | 255.255.248.0 (/21) | 32 | 2046 | |
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6 | 255.255.252.0 (/22) | 64 | 1022 | |
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7 | 255.255.254.0 (/23) | 128 | 510 | |
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8 | 255.255.255.0 (/24) | 256 | 254 | |
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9 | 255.255.255.128 (/25) | 512 | 126 | |
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10 | 255.255.255.192 (/26) | 1024 | 62 | |
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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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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 addresses, follow their instructions in selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single user account and the ISP will assign you a dynamic IP address when the connection is established. If this is the case, it is recommended that you select a network number from 192.168.0.0 to 192.168.255.0. The Internet Assigned Number Authority (IANA) reserved this block of addresses specifically for private use; please do not use any other number unless you are told otherwise. You must also enable Network Address Translation (NAT) on the
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