ZyXEL MI-7248 User Guide - Page 285
Subnetting With Class A and Class B Networks.
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Appendix A IP Addresses and Subnetting Table 127 Class C Subnet Planning (continued) NO. "BORROWED" HOST BITS SUBNET MASK 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 8 16 32 64 128 NO. HOSTS PER SUBNET 30 14 6 2 1 Subnetting With Class A and Class B Networks. For class "A" and class "B" addresses the subnet mask also determines which bits are part of the network number and which are part of the host ID. A class "B" address has two host ID octets available for subnetting and a class "A" address has three host ID octets (see Table 115 on page 279) available for subnetting. The following table is a summary for class "B" subnet planning. Table 128 Class B Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK NO. SUBNETS NO. HOSTS PER SUBNET 1 255.255.128.0 (/17) 2 32766 2 255.255.192.0 (/18) 4 16382 3 255.255.224.0 (/19) 8 8190 4 255.255.240.0 (/20) 16 4094 5 255.255.248.0 (/21) 32 2046 6 255.255.252.0 (/22) 64 1022 7 255.255.254.0 (/23) 128 510 8 255.255.255.0 (/24) 256 254 9 255.255.255.128 (/25) 512 126 10 255.255.255.192 (/26) 1024 62 11 255.255.255.224 (/27) 2048 30 12 255.255.255.240 (/28) 4096 14 13 255.255.255.248 (/29) 8192 6 14 255.255.255.252 (/30) 16384 2 15 255.255.255.254 (/31) 32768 1 MS-7206 User's Guide 285