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.

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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
/2511111111111111111111111110000000network bitshost bits

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

/25
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1158 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1158 hosts
p =
4.Medium
/22 → /2611111111111111111111111111000000network bitshost bits

The network 10.87.124.0/22 is divided into equal subnets with prefix /26. How many subnets N are there?

10.87.124.0/22/26
N =
5.Hard

The network 192.168.233.0/24 is split with VLSM for these LANs: A: 38 hosts, B: 28 hosts, C: 36 hosts, D: 11 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: 38B: 28C: 36D: 11
x =
6.Hard
third octet 239 … 241112816413201618141211commonvaries

A router has routes to these networks: 10.44.239.0/24, 10.44.240.0/24, 10.44.241.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.44.239.0/24 … 10.44.241.0/24
p =

Answer key

  1. 1. H = 6
  2. 2. H = 126
  3. 3. p = 21
  4. 4. N = 16
  5. 5. x = 64
  6. 6. p = 19

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