IP段对应表
24 --1 Subnets -- 254 Hosts/Subnet
/25 -- 2 Subnets -- 126 Hosts/Subnet
26 -- 4 Subnets -- 62 Hosts/Subnet
/27 -- 8 Subnets -- 30 Hosts/Subnet
/28 -- 16 Subnets -- 14 Hosts/Subnet
/29 -- 32 Subnets -- 6 Hosts/Subnet
/30 -- 64 Subnets -- 2 Hosts/Subnet
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