ZyXEL NBG-460N User Guide - Page 318
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Appendix B IP Addresses and Subnetting As these two IP addresses cannot be used for individual hosts, calculate the maximum number of possible hosts in a network as follows: Table 121 Maximum Host Numbers SUBNET MASK HOST ID SIZE 8 bits 255.0.0.0 24 bits 16 bits 255.255.0.0 16 bits 24 bits 255.255.255.0 8 bits 29 bits 255.255.255.2 3 bits 48 224 - 2 216 - 2 28 - 2 23 - 2 MAXIMUM NUMBER OF HOSTS 16777214 65534 254 6 Notation Since the mask is always a continuous number of ones beginning from the left, followed by a continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the number of ones instead of writing the value of each octet. This is usually specified by writing a "/" followed by the number of bits in the mask after the address. 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 122 Alternative Subnet Mask Notation SUBNET MASK ALTERNATIVE LAST OCTET NOTATION (BINARY) 255.255.255.0 /24 0000 0000 255.255.255.12 /25 8 1000 0000 255.255.255.19 /26 2 1100 0000 255.255.255.22 /27 4 1110 0000 255.255.255.24 /28 0 1111 0000 255.255.255.24 /29 8 1111 1000 255.255.255.25 /30 2 1111 1100 LAST OCTET (DECIMAL) 0 128 192 224 240 248 252 318 NBG-460N User's Guide