Table 92 Eight Subnets; Table 93 24-Bit Network Number Subnet Planning - ZyXEL Communications Dimension ES-2108 User Manual

ES-2108 Series User's Guide
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.

Table 92 Eight Subnets

SUBNET
1
2
3
4
5
6
7
8
Subnet Planning
The following table is a summary for subnet planning on a network with a 24-bit network
number.

Table 93 24-bit Network Number Subnet Planning

NO. "BORROWED"
HOST BITS
1
2
3
4
5
6
7
268
SUBNET ADDRESS FIRST ADDRESS
0 1
32 33
64 65
96 97
128 129
160 161
192 193
224 225
SUBNET MASK
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
255.255.255.240 (/28)
255.255.255.248 (/29)
255.255.255.252 (/30)
255.255.255.254 (/31)
BROADCAST
LAST ADDRESS
ADDRESS
30 31
62 63
94 95
126 127
158 159
190 191
222 223
254 255
NO. HOSTS PER
NO. SUBNETS
SUBNET
2 126
4 62
8 30
16 14
32 6
64 2
128 1
Appendix B IP Addresses and Subnetting