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
/2011111111111111111111000000000000network bitshost bits

An access list must match the network 172.16.0.0/20. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/20
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
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.249.0/24 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 9?

192.168.249.0/24/29subnet 9 (subnet 1 starts at .0)
x =
4.Medium
/22 → /2611111111111111111111111111000000network bitshost bits

The network 10.2.248.0/22 is divided into equal subnets with prefix /26. How many subnets N are there?

10.2.248.0/22/26
N =
5.Hard
last octet = 214112816403211608141201networkhost

A host has the address 10.20.162.214/25. What is the fourth octet x of the last usable host address in its subnet?

10.20.162.214/25
x =
6.Hard
last octet = 240112816413211608040201networkhost

A host has the address 10.20.48.240/28. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.48.240/28
x =

Answer key

  1. 1. x = 15
  2. 2. H = 510
  3. 3. x = 71
  4. 4. N = 16
  5. 5. x = 254
  6. 6. x = 255

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