User`s guide

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XStack Storage User’s Guide 185

Base Network: 10001100.00011001.00000000.00000000 = 140.25.0.0/16

Subnet #0: 10001100.00011001.0000 0000.00000000 = 140.25.0.0/20

Subnet #1: 10001100.00011001.0001 0000.00000000 = 140.25.16.0/20

Subnet #2: 10001100.00011001.0010 0000.00000000 = 140.25.32.0/20

Subnet #3: 10001100.00011001.0011 0000.00000000 = 140.25.48.0/20

Subnet #4: 10001100.00011001.0100 0000.00000000 = 140.25.64.0/20

Subnet #13: 10001100.00011001.1101 0000.00000000 = 140.25.208.0/20

Subnet #14: 10001100.00011001.1110 0000.00000000 = 140.25.224.0/20

Subnet #15: 10001100.00011001.1111 0000.00000000 = 140.25.240.0/20

2. Define the Sub-Subnets for Subnet #3 (140.25.48.0/20)

Next, examine the host addresses that can be assigned to subnet #3 (140.25.48.0/20). Since

the host-number field of subnet #3 contains 12 bits, there are 4,094 valid host addresses (2

12 -2), numbered 1 through 4,094, in the address block.

The valid host addresses for subnet #3 are shown below. The italicized portion of each

address identifies the extended-network prefix, while the bold digits identify the 12-bit host-

number field:

Subnet #3: 10001100.00011001.0011 0000.00000000 = 140.25.48.0/20

Host #1: 10001100.00011001.0011 0000.00000001 = 140.25.48.1/20

Host #2: 10001100.00011001.0011 0000.00000010 = 140.25.48.2/20

Host #3: 10001100.00011001.0011 0000.00000011 = 140.25.48.3/20

Host #4093: 10001100.00011001.0011 1111.11111101 = 140.25.63.253/20

Host #4094: 10001100.00011001.0011 1111.11111110 = 140.25.63.254/20

3. Define the Sub-Subnets for Subnet #14 (140.25.224.0/20)

After the base network address is divided into sixteen subnets, subnet #14 is further

subdivided into 16 equal-size address blocks. Since 16 = 2

, four more bits are required to

identify each of the 16 subnets. This means the organization must use a /24 as the extended

network prefix length.

The 16 subnets of the 140.25.224.0/20 address block are shown below. The subnets are

numbered 0 through 15. The italicized portion of each sub-subnet address identifies the

extended-network prefix, while the bold digits identify the 4-bits representing the sub-

subnet-number field:

Subnet #14: 10001100.00011001.1110 0000.00000000 = 140.25.224.0/20

Subnet #14-0: 10001100.00011001.1110 0000.00000000 = 140.25.224.0/24

Subnet #14-1: 10001100.00011001.1110 0001.00000000 = 140.25.225.0/24

Subnet #14-2: 10001100.00011001.1110 0010.00000000 = 140.25.226.0/24

Subnet #14-3: 10001100.00011001.1110 0011.00000000 = 140.25.227.0/24

Subnet #14-4: 10001100.00011001.1110 0100.00000000 = 140.25.228.0/24

Subnet #14-14: 10001100.00011001.1110 1110.00000000 = 140.25.238.0/24

Subnet #14-15: 10001100.00011001.1110 1111.00000000 = 140.25.239.0/24