Table 121 Eight Subnets; Table 122 24-Bit Network Number Subnet Planning; Table 123 16-Bit Network Number Subnet Planning - ZyXEL Communications MAX-206M2 User Manual

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 121 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 122 24-bit Network Number Subnet Planning

NO. "BORROWED"
HOST BITS
1
2
3
4
5
6
7
The following table is a summary for subnet planning on a network with a 16-bit network
number.

Table 123 16-bit Network Number Subnet Planning

NO. "BORROWED"
HOST BITS
1
2
3
4
5
User's Guide
SUBNET
FIRST ADDRESS
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)
SUBNET MASK
255.255.128.0 (/17)
255.255.192.0 (/18)
255.255.224.0 (/19)
255.255.240.0 (/20)
255.255.248.0 (/21)
Appendix D IP Addresses and Subnetting
LAST BROADCAST
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
NO. HOSTS PER
NO. SUBNETS
SUBNET
2 32766
4 16382
8 8190
16 4094
32 2046
273