ZyXEL Communications FSG1100HN User Manual page 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 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
FSG1100HN User's Guide
SUBNET SUBNET
ADDRESS
1 0
2 32
3 64
4 96
5 128
6 160
7 192
8 224
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)
Appendix B IP Addresses and Subnetting
FIRST LAST
ADDRESS ADDRESS
1 30
33 62
65 94
97 126
129 158
161 190
193 222
225 254
NO. SUBNETS
2
4
8
16
32
64
128
BROADCAST
ADDRESS
31
63
95
127
159
191
223
255
NO. HOSTS
PER SUBNET
126
62
30
14
6
2
1
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