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 /22112816413211618140201oneszeros

Write the subnet mask of a /22 network in dotted-decimal notation. What is the value x of its third octet?

/22
x =
2.Easy
/2311111111111111111111111000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /23?

/23
H =
3.Medium
255.255.254.011111111111111111111111000000000network bitshost bits

A subnet uses the mask 255.255.254.0. How many usable host addresses H does it have?

255.255.254.0
H =
4.Medium
/?11111111111111111111111111110000network bitshost bits

A department needs 10 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

10 hosts
p =
5.Hard
last octet = 36012806413201608140201networkhost

A host has the address 10.20.107.36/30. What is the fourth octet x of the last usable host address in its subnet?

10.20.107.36/30
x =
6.Hard
last octet = 179112806413211608041211networkhost

A host has the address 10.20.63.179/27. What is the fourth octet x of its network address?

10.20.63.179/27
x =

Answer key

  1. 1. x = 252
  2. 2. H = 510
  3. 3. H = 510
  4. 4. p = 28
  5. 5. x = 38
  6. 6. x = 160

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