ZyXEL NBG6615 User Guide - Page 144
Example: Eight Subnets, Subnet Planning, LAST OCTET BIT VALUE
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Appendix A IP Addresses and Subnetting Table 57 Subnet 4 (continued) IP/SUBNET MASK NETWORK NUMBER Subnet Mask (Binary) 11111111.11111111.11111111. 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 LAST OCTET BIT VALUE 11000000 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 58 Eight Subnets SUBNET SUBNET ADDRESS FIRST ADDRESS LAST ADDRESS 1 0 1 30 2 32 33 62 3 64 65 94 4 96 97 126 5 128 129 158 6 160 161 190 7 192 193 222 8 224 225 254 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 59 24-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK 1 255.255.255.128 (/25) 2 255.255.255.192 (/26) 3 255.255.255.224 (/27) 4 255.255.255.240 (/28) 5 255.255.255.248 (/29) 6 255.255.255.252 (/30) 7 255.255.255.254 (/31) NO. SUBNETS 2 4 8 16 32 64 128 NO. HOSTS PER SUBNET 126 62 30 14 6 2 1 The following table is a summary for subnet planning on a network with a 16-bit network number. Table 60 16-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK 1 255.255.128.0 (/17) 2 255.255.192.0 (/18) NO. SUBNETS 2 4 NO. HOSTS PER SUBNET 32766 16382 NBG6615's User's Guide 144