Understanding IP Addressing: Everything You Ever Wanted To Know

Appendix C – Subnetting Examples

Subnetting Exercise #1
Assume that you have been assigned the 132.45.0.0/16 network block. You need to establish eight subnets

1. __________ binary digits are required to define eight subnets.

2. Specify the extended-network-prefix that allows the creation of 8 subnets.
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3. Express the subnets in binary format and dotted decimal notation:
#0 ________________________________________________________________
#1 ________________________________________________________________
#2 ________________________________________________________________
#3 ________________________________________________________________
#4 ________________________________________________________________
#5 ________________________________________________________________
#6 ________________________________________________________________
#7 ________________________________________________________________

4. List the range of host addresses that can be assigned to Subnet #3 (132.45.96.0/19).
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5. What is the broadcast address for Subnet #3 (132.45.96.0/19).
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Subnetting Exercise #2

1. Assume that you have been assigned the 200.35.1.0/24 network block. Define an extended-network-prefix that allows the creation of 20 hosts on each subnet.
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2. What is the maximum number of hosts that can be assigned to each subnet?
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3. What is the maximum number of subnets that can be defined?
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4. Specify the subnets of 200.35.1.0/24 in binary format and dotted decimal notation.
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5. List range of host addresses that can be assigned to Subnet #6 (200.35.1.192/27)
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6. What is the broadcast address for subnet 200.35.1.192/27?
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Solution for Subnetting Exercise #1
Assume that you have been assigned the 132.45.0.0/16 network block. You need to establish 8 subnets.

1. Three binary digits are required to define the eight subnets.

2. Specify the extended-network-prefix that allows the creation of 8 subnets.
/19 or 255.255.224.0

3. Express the subnets in binary format and dotted decimal notation:
Subnet #0: 10000100.00101101. 000 00000.00000000 = 132.45.0.0/19
Subnet #1: 10000100.00101101. 001 00000.00000000 = 132.45.32.0/19
Subnet #2: 10000100.00101101. 010 00000.00000000 = 132.45.64.0/19
Subnet #3: 10000100.00101101. 011 00000.00000000 = 132.45.96.0/19
Subnet #4: 10000100.00101101. 100 00000.00000000 = 132.45.128.0/19
Subnet #5: 10000100.00101101. 101 00000.00000000 = 132.45.160.0/19
Subnet #6: 10000100.00101101. 110 00000.00000000 = 132.45.192.0/19
Subnet #7: 10000100.00101101. 111 00000.00000000 = 132.45.224.0/19

4. List the range of host addresses that can be assigned to Subnet #3 (132.45.96.0/19).
Subnet #3: 10000100.00101101.011 00000.00000000 = 132.45.96.0/19
Host #1: 10000100.00101101.011 00000.00000001 = 132.45.96.1/19
Host #2: 10000100.00101101.011 00000.00000010 = 132.45.96.2/19
Host #3: 10000100.00101101.011 00000.00000011 = 132.45.96.3/19
:
Host #8190: 10000100.00101101.011 11111.11111110 = 132.45.127.254/19

4. What is the broadcast address for Subnet #3 (132.45.96.0/19)?
10000100.00101101.011 11111.11111111 = 132.45.127.255/19

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Solution for Subnetting Exercise #2
1. Assume that you have been assigned the 200.35.1.0/24 network block. Define an extended-network-prefix that allows the creation of 20 hosts on each subnet.
A minimum of five bits are required to define 20 hosts so the extended-network- prefix is a /27 (27 = 32-5).

2. What is the maximum number of hosts that can be assigned to each subnet?
The maximum number of hosts on each subnet is 2 5 -2, or 30.

3. What is the maximum number of subnets that can be defined?
The maximum number of subnets is 2 3 , or 8.

4. Specify the subnets of 200.35.1.0/24 in binary format and dotted decimal notation.
Subnet #0: 11001000.00100011.00000001. 000 00000 = 200.35.1.0/27
Subnet #1: 11001000.00100011.00000001. 001 00000 = 200.35.1.32/27
Subnet #2: 11001000.00100011.00000001. 010 00000 = 200.35.1.64/27
Subnet #3: 11001000.00100011.00000001. 011 00000 = 200.35.1.96/27
Subnet #4: 11001000.00100011.00000001. 100 00000 = 200.35.1.128/27
Subnet #5: 11001000.00100011.00000001. 101 00000 = 200.35.1.160/27
Subnet #6: 11001000.00100011.00000001. 110 00000 = 200.35.1.192/27
Subnet #7: 11001000.00100011.00000001. 111 00000 = 200.35.1.224/27

5. List range of host addresses that can be assigned to Subnet #6 (200.35.1.192/27)
Subnet #6: 11001000.00100011.00000001. 110 00000 = 200.35.1.192/27
Host #1: 11001000.00100011.00000001.110 00001 = 200.35.1.193/27
Host #2: 11001000.00100011.00000001.110 00010 = 200.35.1.194/27
Host #3: 11001000.00100011.00000001.110 00011 = 200.35.1.195/27
:
Host #29: 11001000.00100011.00000001.110 11101 = 200.35.1.221/27
Host #30: 11001000.00100011.00000001.110 11110 = 200.35.1.222/27

6. What is the broadcast address for subnet 200.35.1.192/27?
11001000.00100011.00000001.110 11111 = 200.35.1.223

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