ZyXEL Communications ENTERPRISE NETWORK CENTER Manual page 273

The following table shows IP address last octet values for each subnet.
Table 143 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 144 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 145 16-bit Network Number Subnet Planning
NO. "BORROWED"
HOST BITS
1
2
3
4
5
6
7
8
9
10
11
12
ENC 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)
255.255.252.0 (/22)
255.255.254.0 (/23)
255.255.255.0 (/24)
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
255.255.255.240 (/28)
Appendix B 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
64 1022
128 510
256 254
512 126
1024 62
2048 30
4096 14
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