ZyXEL Communications NBG6515 User Manual page 174

Exa m ple : Eig ht Sub ne ts
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 87 Eight Subnets
SUBNET
1
2
3
4
5
6
7
8
Sub ne t Pla nning
The following table is a summary for subnet planning on a network with a 24-bit network number.
Table 88 24-bit Network Number Subnet Planning
NO . "BO RRO WED"
HO ST BIT S
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 89 16-bit Network Number Subnet Planning
NO . "BO RRO WED"
HO ST BIT S
1
2
3
4
5
6
7
8
9
Appendix A IP Addresses and Subnetting
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)
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)
255.255.252.0 (/22)
255.255.254.0 (/23)
255.255.255.0 (/24)
255.255.255.128 (/25)
NBG6515 User's Guide
L AST ADDRESS
30
62
94
126
158
190
222
254
NO . SUBNET S
2
4
8
16
32
64
128
NO . SUBNET S
2
4
8
16
32
64
128
256
512
174
BRO ADC AST
ADDRESS
31
63
95
127
159
191
223
255
NO . HO ST S PER
SUBNET
126
62
30
14
6
2
1
NO . HO ST S PER
SUBNET
32766
16382
8190
4094
2046
1022
510
254
126