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
third octet of /17112806403201608040201oneszeros

Write the subnet mask of a /17 network in dotted-decimal notation. What is the value x of its third octet?

/17
x =
2.Easy
255.255.255.19211111111111111111111111111000000network bitshost bits

A subnet has the mask 255.255.255.192. What is its prefix length p?

255.255.255.192
p =
3.Medium
/20 → /2211111111111111111111110000000000network bitshost bits

The network 10.13.32.0/20 is divided into equal subnets with prefix /22. How many subnets N are there?

10.13.32.0/20/22
N =
4.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.180.0/24 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?

192.168.180.0/24/28subnet 8 (subnet 1 starts at .0)
x =
5.Hard
last octet = 98012816413201608041201networkhost

A host has the address 10.20.244.98/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.244.98/30
x =
6.Hard
last octet = 80012816403211608040201networkhost

A host has the address 10.20.192.80/28. What is the fourth octet x of its network address?

10.20.192.80/28
x =

Answer key

  1. 1. x = 128
  2. 2. p = 26
  3. 3. N = 4
  4. 4. x = 112
  5. 5. x = 99
  6. 6. x = 80

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