ZyXEL MWR102 User Guide - Page 97
Subnetting, Table 29,
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For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with subnet mask 255.255.255.128. The following table shows some possible subnet masks using both notations. Table 29 Alternative Subnet Mask Notation SUBNET MASK ALTERNATIV LAST OCTET LAST OCTET E NOTATION (BINARY) (DECIMAL) 255.255.255.0 /24 255.255.255.128 /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 0000 0000 0 1000 0000 128 1100 0000 192 1110 0000 224 1111 0000 240 1111 1000 248 1111 1100 252 Subnetting You can use subnetting to divide one network into multiple sub-networks. In the following example a network administrator creates two sub-networks to isolate a group of servers from the rest of the company network for security reasons. In this example, the company network address is 192.168.1.0. The first three octets of the address (192.168.1) are the network number, and the remaining octet is the host ID, allowing a maximum of 28 - 2 or 254 possible hosts. The following figure shows the company network before subnetting. Figure 43 Subnetting Example: Before Subnetting 97