ZyXEL Communications P-870H Series User Manual page 295

Appendix C IP Addresses and Subnetting
Table 102 Subnet 4 (continued)
IP/SUBNET MASK
Subnet Address:
192.168.1.192
Broadcast Address:
192.168.1.255
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 103 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 104 24-bit Network Number Subnet Planning
NO. "BORROWED"
HOST BITS
1
2
3
4
5
6
7
296
NETWORK NUMBER
Lowest Host ID: 192.168.1.193
Highest Host ID: 192.168.1.254
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)
LAST OCTET BIT
VALUE
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
P-870H/HW Series User's Guide