ZyXEL FSG1100HN User Guide - Page 116
Network Size, Subnet Mask - Identifying Network Number, Subnet Masks
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Appendix B IP Addresses and Subnetting Subnet Mask - Identifying Network Number Network Number Host ID 1ST OCTET: (192) 11000000 2ND OCTET: (168) 10101000 3RD OCTET: (1) 00000001 4TH OCTET: (2) 00000010 By convention, subnet masks always consist of a continuous sequence of ones beginning from the leftmost bit of the mask, followed by a continuous sequence of zeros, for a total number of 32 bits. Subnet masks can be referred to by the size of the network number part (the bits with a "1" value). For example, an "8-bit mask" means that the first 8 bits of the mask are ones and the remaining 24 bits are zeroes. Subnet masks are expressed in dotted decimal notation just like IP addresses. The following examples show the binary and decimal notation for 8-bit, 16-bit, 24-bit and 29-bit subnet masks. Subnet Masks 8-bit mask 16-bit mask 24-bit mask 29-bit mask BINARY 1ST OCTET 11111111 2ND OCTET 00000000 3RD OCTET 00000000 4TH OCTET 00000000 DECIMAL 255.0.0. 11111111 11111111 00000000 00000000 255.255.0.0 11111111 11111111 11111111 00000000 255.255.255.0 11111111 11111111 11111111 11111000 255.255.255.248 Network Size The size of the network number determines the maximum number of possible hosts you can have on your network. The larger the number of network number bits, the smaller the number of remaining host ID bits. An IP address with host IDs of all zeros is the IP address of the network (192.168.1.0 with a 24-bit subnet mask, for example). An IP address with host IDs of all ones is the broadcast address for that network (192.168.1.255 with a 24-bit subnet mask, for example). 116 FSG1100HN User's Guide