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
third octet of /22112816413211618140201oneszeros

Write the subnet mask of a /22 network in dotted-decimal notation. What is the value x of its third octet?

/22
x =
2.Easy
/2811111111111111111111111111110000network bitshost bits

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

/28
H =
3.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 787 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

787 hosts
p =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.202.0/24 is divided into /26 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the network address of subnet 2?

192.168.202.0/24/26subnet 2 (subnet 1 starts at .0)
x =
5.Hard
last octet = 119012816413211608141211networkhost

A host has the address 10.20.184.119/29. What is the fourth octet x of its network address?

10.20.184.119/29
x =
6.Hard

The network 192.168.205.0/24 is split with VLSM for these LANs: A: 27 hosts, B: 4 hosts, C: 21 hosts, D: 14 hosts, E: 3 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 B?

A: 27B: 4C: 21D: 14E: 3
x =

Answer key

  1. 1. x = 252
  2. 2. H = 14
  3. 3. p = 22
  4. 4. x = 64
  5. 5. x = 112
  6. 6. x = 80

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