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
/2311111111111111111111111000000000network bitshost bits

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

/23
H =
2.Easy
/2711111111111111111111111111100000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /27?

/27
H =
3.Medium
/?11111111111111111111111110000000network bitshost bits

A department needs 113 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

113 hosts
p =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 10.123.112.0/24 is divided into equal subnets with prefix /26. How many subnets N are there?

10.123.112.0/24/26
N =
5.Hard
third octet 83 … 85012816403211608041211commonvaries

A router has routes to these networks: 10.38.83.0/24, 10.38.84.0/24, 10.38.85.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.38.83.0/24 … 10.38.85.0/24
p =
6.Hard
last octet = 63012806413211618141211networkhost

A host has the address 10.20.205.63/28. What is the fourth octet x of its network address?

10.20.205.63/28
x =

Answer key

  1. 1. H = 510
  2. 2. H = 30
  3. 3. p = 25
  4. 4. N = 4
  5. 5. p = 21
  6. 6. x = 48

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