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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
/2711111111111111111111111111100000network bitshost bits

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

/27
H =
2.Easy
255.255.128.011111111111111111000000000000000network bitshost bits

A subnet has the mask 255.255.128.0. What is its prefix length p?

255.255.128.0
p =
3.Medium
/20 → /2611111111111111111111111111000000network bitshost bits

The network 10.170.192.0/20 is divided into equal subnets with prefix /26. How many subnets N are there?

10.170.192.0/20/26
N =
4.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1124 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1124 hosts
p =
5.Hard
third octet = 176112806413211608040201networkhost

A host has the address 172.20.176.174/20. What is the third octet x of its network address?

172.20.176.174/20
x =
6.Hard
last octet = 209112816403211608040211networkhost

A host has the address 10.20.83.209/27. What is the fourth octet x of the last usable host address in its subnet?

10.20.83.209/27
x =

Answer key

  1. 1. H = 30
  2. 2. p = 17
  3. 3. N = 64
  4. 4. p = 21
  5. 5. x = 176
  6. 6. x = 222

Full step-by-step solutions: practise this topic on examproblems.com.