The 16 subnets of the 140.25.0.0/16 address block are listed in the fol 
lowing code sample. The subnets are numbered 0 through 15. The
underlined portion of each address identifies the extended network pre 
fix, while the bold digits identify the 4 bits representing the subnet
number field: 
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 
Define the Host Addresses for Subnet #3 (140.25.48.0/20)
Figure 23 shows the host addresses that can be assigned to Subnet #3
(140.25.48.0/20). 
F I G U R E   2 3 .   H o s t   A d d re s s   f o r   S u b n e t   # 3   ( 1 4 0 . 2 5 . 4 8 . 0 / 2 0 )
Since the host number field of Subnet #3 contains 12 bits, there are
4,094 valid host addresses (212  2) in the address block. The hosts are
numbered 1 through 4,094. The valid host addresses for Subnet #3 are
listed in the following sample code. The underlined 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 
2 7






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