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
/2511111111111111111111111110000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /25?

/25
H =
2.Easy
/2411111111111111111111111100000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /24?

/24
H =
3.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 10.10.90.0/24 is divided into equal subnets with prefix /28. How many subnets N are there?

10.10.90.0/24/28
N =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 5 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/245 subnets
H =
5.Hard
third octet = 144112806403211608040201networkhost

A host has the address 172.20.144.9/19. What is the third octet x of its network address?

172.20.144.9/19
x =
6.Hard
third octet = 53012806413211608140211networkhost

A host has the address 172.20.53.26/19. What is the third octet x of its subnet's broadcast address?

172.20.53.26/19
x =

Answer key

  1. 1. H = 126
  2. 2. H = 254
  3. 3. N = 16
  4. 4. H = 30
  5. 5. x = 128
  6. 6. x = 63

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