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
/2811111111111111111111111111110000network bitshost bits

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

/28
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
255.255.255.25211111111111111111111111111111100network bitshost bits

A subnet uses the mask 255.255.255.252. How many usable host addresses H does it have?

255.255.255.252
H =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.125.0/24 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 network address of subnet 4?

192.168.125.0/24/27subnet 4 (subnet 1 starts at .0)
x =
5.Hard
third octet = 79012816403201618141211networkhost

A host has the address 172.20.79.253/22. What is the third octet x of its subnet's broadcast address?

172.20.79.253/22
x =
6.Hard
last octet = 239112816413201618141211networkhost

A host has the address 10.20.10.239/29. What is the fourth octet x of the last usable host address in its subnet?

10.20.10.239/29
x =

Answer key

  1. 1. H = 14
  2. 2. H = 4094
  3. 3. H = 2
  4. 4. x = 96
  5. 5. x = 79
  6. 6. x = 238

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