ZyXEL P-870H-53A v2 User Guide - Page 288
Example: Eight Subnets, Subnet Planning
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Appendix C IP Addresses and Subnetting Table 102 Subnet 4 (continued) IP/SUBNET MASK NETWORK NUMBER LAST OCTET BIT VALUE 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 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 SUBNET ADDRESS 1 0 2 32 3 64 4 96 5 128 6 160 7 192 8 224 FIRST ADDRESS 1 33 65 97 129 161 193 225 LAST ADDRESS 30 62 94 126 158 190 222 254 BROADCAST ADDRESS 31 63 95 127 159 191 223 255 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 SUBNET MASK 255.255.255.128 (/25) NO. SUBNETS NO. HOSTS PER SUBNET 2 126 2 255.255.255.192 (/26) 4 62 3 255.255.255.224 (/27) 8 30 4 255.255.255.240 (/28) 16 14 5 255.255.255.248 (/29) 32 6 6 255.255.255.252 (/30) 64 2 7 255.255.255.254 (/31) 128 1 288 P-870H/HW Series User's Guide