ITT-116 Subnetting Worksheet
Use the following tables as references for the remainder of the document.
IP Address Classes
Class A
1-127
Leading bit pattern
0
Network.Host.Host.Host
Class B
128-191
Leading bit pattern
10
Network.Network.Host.Host
Class C
224-239
Leading bit pattern
110
Network.Network.Network.Host
Class D
224-230
Reserved for multicast
Class E
240-255
Reserved for experimental, used for research.
Private Addresses
Class A
10.0.0.0 – 10.255.255.255
Class B
172.16.0.0 – 172.31.255.255
Class C
192.168.0.0 – 192.168.255.255
APIPA
169.254.0.1 – 169.254.255.254
Binary to Decimal Conversion
128
64
32
16
8
4
2
1
Answers
0
0
0
1
1
0
1
1
0
0
1
1
1
0
1
1
1
1
1
1
0
0
0
0
0
0
1
1
0
0
0
1
1
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
0
1
1
0
1
1
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
1
0
Decimal to Binary Conversion
128
64
32
16
8
4
2
1
Problem
200
255
107
224
192
98
242
224
172
100
Address Classes
Address
Class
148.17.9.1
220.200.23.1
177.100.15.4
249.241.80.78
198.155.72.56
10.0.0.1
192.168.123.42
123.231.132.9
42.42.42.42
242.81.64.3
Network Identification
Highlight the Network Portion:
117.
89.
56.
90
33.
0.
0.
2
10.
252
1.
1
150.
15.
16.
3
192.
168.
123.
1
199.
155.
66.
56
242.
200.
23.
1
158.
200.
45.
62
218.
155.
230.
41
100.
25.
1.
1
Highlight the Host Portion
117.
89.
56.
90
33.
0.
0.
2
10.
252
1.
1
150.
15.
16.
3
192.
168.
123.
1
199.
155.
66.
56
242.
200.
23.
1
158.
200.
45.
62
218.
155.
230.
41
100.
25.
1.
1
Network Addressing
Write the network addresses for the provided IP address/subnet mask.
10.10.48.80 255.255.255.0
10.10.10.10 255.0.0.0
27.125.200.151 255.0.0.0
199.203.32.91 255.255.255.0
186.31.32.110 255.255.0.0
192.168.24.19 255.255.0.0
15.30.20.20 255.255.255.0
27.0.2.1 255.0.0.0
164.42.3.4 255.255.255.0
25.25.142.8 255.0.0.0
Host Addresses
Using the IP address and subnet mask shown, write the host address
10.10.48.80 255.255.255.0
10.10.10.10 255.0.0.0
27.125.200.151 255.0.0.0
199.203.32.91 255.255.255.0
186.31.32.110 255.255.0.0
192.168.24.19 255.255.0.0
15.30.20.20 255.255.255.0
27.0.2.1 255.0.0.0
164.42.3.4 255.255.255.0
25.25.142.8 255.0.0.0
Default Subnet Mask
Write the correct default subnet mask for each
10.10.48.80 255.255.255.0
10.10.10.10 255.0.0.0
27.125.200.151 255.0.0.0
199.203.32.91 255.255.255.0
186.31.32.110 255.255.0.0
192.168.24.19 255.255.0.0
15.30.20.20 255.255.255.0
27.0.2.1 255.0.0.0
164.42.3.4 255.255.255.0
25.25.142.8 255.0.0.0
Custom Subnet Masks
Fill in the blanks
Required Subnets
14
Required Hosts
14
Network Address
192.10.10.0
Address Class
Default Subnet Mask
Custom Subnet Mask
Total Number of Subnets
Total Number of Host Addresses
Number of Usable Addresses
Number of Bits Borrowed
What is the 10th Subnet Range?
What is the subnet number for the 2nd Subnet?
What is the broadcast address for the 12th Subnet?
What are the usable addresses for the 10th Subnet?
Required Subnets
1000
Required Hosts
60
Network Address
156.100.0.0
Address Class
Default Subnet Mask
Custom Subnet Mask
Total Number of Subnets
Total Number of Host Addresses
Number of Usable Addresses
Number of Bits Borrowed
What is the 10th Subnet Range?
What is the subnet number for the 2nd Subnet?
What is the broadcast address for the 12th Subnet?
What are the usable addresses for the 100th Subnet?
Required Subnets
6
Required Hosts
28
Network Address
182.86.7.0
Address Class
Default Subnet Mask
Custom Subnet Mask
Total Number of Subnets
Total Number of Host Addresses
Number of Usable Addresses
Number of Bits Borrowed
What is the 3rd Subnet Range?
What is the subnet number for the 2nd Subnet?
What is the broadcast address for the 1st Subnet?
What are the usable addresses for the 6th Subnet?
Required Subnets
2000
Required Hosts
15
Network Address
187.112.0.0
Address Class
Default Subnet Mask
Custom Subnet Mask
Total Number of Subnets
Total Number of Host Addresses
Number of Usable Addresses
Number of Bits Borrowed
What is the 100th Subnet Range?
What is the subnet number for the 200th Subnet?
What is the broadcast address for the 42nd Subnet?
What are the usable addresses for the 10th Subnet?
Required Subnets
412
Required Hosts
1000
Network Address
128.47.0.0
Address Class
Default Subnet Mask
Custom Subnet Mask
Total Number of Subnets
Total Number of Host Addresses
Number of Usable Addresses
Number of Bits Borrowed
What is the 10th Subnet Range?
What is the subnet number for the 42nd Subnet?
What is the broadcast address for the 300th Subnet?
What are the usable addresses for the 12th Subnet?
Create the subnetting table for each subnet required for your corporate network.
Required Subnets
Required Hosts
Network Address
Address Class
Default Subnet Mask
Custom Subnet Mask
Total Number of Subnets
Total Number of Host Addresses
Number of Usable Addresses
Number of Bits Borrowed
What are the usable addresses for the 1st Subnet?
What are the usable addresses for the 2nd Subnet?
What are the usable addresses for the 3rd Subnet?
What are the usable addresses for the 4th Subnet?
What are the usable addresses for the 5th Subnet?