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Appendix D IP Addresses and Subnetting
Table 67 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 68 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 69 24-bit Network Number Subnet Planning
NO. "BORROWED"
HOST BITS
1
2
3
4
5
6
7
196
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
HES-309M Series User's Guide
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