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
/2011111111111111111111000000000000network bitshost bits

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

/20
H =
2.Easy
/2211111111111111111111110000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /22?

/22
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 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.230.0/24 is divided into /29 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 9?

192.168.230.0/24/29subnet 9 (subnet 1 starts at .0)
x =
5.Hard
last octet = 11012806403201618041211networkhost

A host has the address 10.20.73.11/27. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.73.11/27
x =
6.Hard
third octet = 74012816403201618041201networkhost

A host has the address 172.20.74.227/19. What is the third octet x of its subnet's broadcast address?

172.20.74.227/19
x =

Answer key

  1. 1. H = 4094
  2. 2. H = 1022
  3. 3. H = 4094
  4. 4. x = 64
  5. 5. x = 31
  6. 6. x = 95

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