The broadcast address for Subnet #3 is the all 1s host address or: 
10001100.00011001.0011 1111.11111111 = 140.25.63.255 
The broadcast address for Subnet #3 is exactly one less than the base
address for Subnet #4 (140.25.64.0). 
Define the Sub Subnets for Subnet #14 (140.25.224.0/20)
After the base network address is divided into 16 subnets, Subnet #14
is subdivided into 16 equally sized address blocks. This division is illus 
trated in Figure 24. 
F I G U R E   2 4 .   S u b   S u b n e t s   f o r   S u b n e t   # 1 4   ( 1 4 0 . 2 5 . 2 2 4 . 0 / 2 0 )
Since 16 = 24, four more bits are required to identify each of the 16
subnets. This means that the organization will need to use a /24 as the
extended network prefix length. The 16 subnets of the 140.25.224.0/20
address block are listed in the following sample code. The subnets are
numbered 0 through 15. The underlined 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 
U N D E R S TA N D I N G   I P   A D D R E S S I N G
2 8






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