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
/2311111111111111111111111000000000network bitshost bits

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

/23
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
255.255.240.011111111111111111111000000000000network bitshost bits

A subnet uses the mask 255.255.240.0. How many usable host addresses H does it have?

255.255.240.0
H =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.1.0/24 is divided into /27 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 5?

192.168.1.0/24/27subnet 5 (subnet 1 starts at .0)
x =
5.Hard
last octet = 106012816413201618041201networkhost

A host has the address 10.20.17.106/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.17.106/29
x =
6.Hard

The network 192.168.176.0/24 is split with VLSM for these LANs: A: 106 hosts, B: 8 hosts, C: 23 hosts, D: 35 hosts. Subnets are allocated from .0 upwards, the LAN with the most hosts first, each with the smallest subnet that fits. What is the fourth octet x of the network address of LAN C?

A: 106B: 8C: 23D: 35
x =

Answer key

  1. 1. H = 510
  2. 2. H = 62
  3. 3. H = 4094
  4. 4. x = 159
  5. 5. x = 111
  6. 6. x = 192

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