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
/2811111111111111111111111111110000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /28?

/28
H =
2.Easy
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
3.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 10.215.25.0/24 is divided into equal subnets with prefix /27. How many subnets N are there?

10.215.25.0/24/27
N =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.34.0/24 is divided into /29 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the broadcast address of subnet 10?

192.168.34.0/24/29subnet 10 (subnet 1 starts at .0)
x =
5.Hard
third octet 191 … 192112806413211618141211commonvaries

A router has routes to these networks: 10.143.191.0/24, 10.143.192.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.143.191.0/24 … 10.143.192.0/24
p =
6.Hard
last octet = 236112816413201618140201networkhost

A host has the address 10.20.74.236/29. What is the fourth octet x of the last usable host address in its subnet?

10.20.74.236/29
x =

Answer key

  1. 1. H = 14
  2. 2. H = 62
  3. 3. N = 8
  4. 4. x = 79
  5. 5. p = 17
  6. 6. x = 238

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