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
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
2.Easy
/2811111111111111111111111111110000network bitshost bits

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

/28
H =
3.Medium
/20 → /2711111111111111111111111111100000network bitshost bits

The network 10.81.144.0/20 is divided into equal subnets with prefix /27. How many subnets N are there?

10.81.144.0/20/27
N =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.248.0/24 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 4?

192.168.248.0/24/27subnet 4 (subnet 1 starts at .0)
x =
5.Hard
last octet = 54012806413211608141201networkhost

A host has the address 10.20.0.54/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.0.54/30
x =
6.Hard

The network 192.168.122.0/24 is split with VLSM for these LANs: A: 15 hosts, B: 60 hosts, C: 9 hosts, D: 59 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: 15B: 60C: 9D: 59
x =

Answer key

  1. 1. H = 62
  2. 2. H = 14
  3. 3. N = 128
  4. 4. x = 127
  5. 5. x = 55
  6. 6. x = 160

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