IPv4 subnetting worksheet with answers

Free printable IPv4 subnetting worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________ Date: ____________

1.Easy

Write the subnet mask of a /19 network in dotted-decimal notation. What is the value x of its third octet?

/19

x =

2.Easy

Write the subnet mask of a /26 network in dotted-decimal notation. What is the value x of its fourth octet?

/26

x =

3.Medium

The network 172.26.0.0/16 is divided into equal subnets with prefix /22. How many subnets N are there?

172.26.0.0/16/22

N =

4.Medium

The network 192.168.47.0/24 is divided into /28 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the network address of subnet 8?

192.168.47.0/24/28subnet 8 (subnet 1 starts at .0)

x =

5.Hard

A router has routes to these networks: 10.44.172.0/24, 10.44.173.0/24, 10.44.174.0/24, 10.44.175.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.44.172.0/24 … 10.44.175.0/24

p =

6.Hard

A router has routes to these networks: 10.76.82.0/24, 10.76.83.0/24, 10.76.84.0/24, 10.76.85.0/24, 10.76.86.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.76.82.0/24 … 10.76.86.0/24

p =

Answer key

1. x = 224
2. x = 192
3. N = 64
4. x = 112
5. p = 22
6. p = 21

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