ZyXEL FSG1100HN User Guide - Page 121

Example: Eight Subnets, Subnet Planning, SUBNET, ADDRESS, FIRST, BROADCAST, NO. BORROWED, HOST BITS

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Appendix B IP Addresses and Subnetting Example: Eight Subnets Similarly, use a 27-bit mask to create eight subnets (000, 001, 010, 011, 100, 101, 110 and 111). The following table shows IP address last octet values for each subnet. Eight Subnets SUBNET 1 2 3 4 5 6 7 8 SUBNET ADDRESS 0 32 64 96 128 160 192 224 FIRST ADDRESS 1 33 65 97 129 161 193 225 LAST ADDRESS 30 62 94 126 158 190 222 254 BROADCAST ADDRESS 31 63 95 127 159 191 223 255 Subnet Planning The following table is a summary for subnet planning on a network with a 24-bit network number. 24-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS 1 2 3 4 5 6 7 SUBNET MASK 255.255.255.128 (/25) 255.255.255.128 (/26) 255.255.255.128 (/27) 255.255.255.128 (/28) 255.255.255.128 (/29) 255.255.255.128 (/30) 255.255.255.128 (/31) NO. SUBNETS 2 4 8 16 32 64 128 NO. HOSTS PER SUBNET 126 62 30 14 6 2 1 FSG1100HN User's Guide 121

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Appendix B IP Addresses and Subnetting
FSG1100HN User’s Guide
121
Example: Eight Subnets
Similarly, use a 27-bit mask to create eight subnets (000, 001, 010, 011, 100,
101, 110 and 111).
The following table shows IP address last octet values for each subnet.
Eight Subnets
SUBNET
SUBNET
ADDRESS
FIRST
ADDRESS
LAST
ADDRESS
BROADCAST
ADDRESS
1
0
1
30
31
2
32
33
62
63
3
64
65
94
95
4
96
97
126
127
5
128
129
158
159
6
160
161
190
191
7
192
193
222
223
8
224
225
254
255
Subnet Planning
The following table is a summary for subnet planning on a network with a 24-bit
network number.
24-bit Network Number Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS
PER SUBNET
1
255.255.255.128 (/25)
2
126
2
255.255.255.128 (/26)
4
62
3
255.255.255.128 (/27)
8
30
4
255.255.255.128 (/28)
16
14
5
255.255.255.128 (/29)
32
6
6
255.255.255.128 (/30)
64
2
7
255.255.255.128 (/31)
128
1