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
/2911111111111111111111111111111000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /29?

/29
H =
2.Easy
/2011111111111111111111000000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /20?

/20
H =
3.Medium
/22 → /2611111111111111111111111111000000network bitshost bits

The network 10.91.236.0/22 is divided into equal subnets with prefix /26. How many subnets N are there?

10.91.236.0/22/26
N =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 20 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2420 subnets
H =
5.Hard

The network 192.168.187.0/24 is split with VLSM for these LANs: A: 20 hosts, B: 28 hosts, C: 87 hosts, D: 5 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 A?

A: 20B: 28C: 87D: 5
x =
6.Hard
third octet = 126012816413211618141201networkhost

A host has the address 172.20.126.184/20. What is the third octet x of its network address?

172.20.126.184/20
x =

Answer key

  1. 1. H = 6
  2. 2. H = 4094
  3. 3. N = 16
  4. 4. H = 6
  5. 5. x = 160
  6. 6. x = 112

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