Appendix D IP Addresses and Subnetting
User’s Guide
306
Example: Eight SubnetsSimilarly, 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.
Subnet PlanningThe following table is a summary for subnet planning on a network with a 24-bit
network number.
Subnet Address:
192.168.1.192 Lowest Host ID: 192.168.1.193
Broadcast Address:
192.168.1.255 Highest Host ID: 192.168.1.254
Table 121 Subnet 4 (continued)
IP/SUBNET MASK NETWORK NUMBER LAST OCTET BIT
VALUE
Table 122 Eight Subnets
SUBNET SUBNET
ADDRESS FIRST ADDRESS LAST
ADDRESS BROADCAST
ADDRESS
1 0 1 30 31
232 33 62 63
364 65 94 95
496 97 126 127
5128 129 158 159
6160 161 190 191
7192 193 222 223
8224 225 254 255
Table 123 24-bit Network Number Subnet Planning
NO. “BORROWED”
HOST BITS SUBNET MASK NO. SUBNETS NO. HOSTS PER
SUBNET
1255.255.255.128 (/25) 2126
2255.255.255.192 (/26) 462
3255.255.255.224 (/27) 830
4255.255.255.240 (/28) 16 14
5255.255.255.248 (/29) 32 6
6255.255.255.252 (/30) 64 2
7255.255.255.254 (/31) 128 1