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
/2411111111111111111111111100000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /24?

/24
H =
3.Medium
255.255.248.011111111111111111111100000000000network bitshost bits

A subnet uses the mask 255.255.248.0. How many usable host addresses H does it have?

255.255.248.0
H =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.237.0/24 is divided into /26 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?

192.168.237.0/24/26subnet 4 (subnet 1 starts at .0)
x =
5.Hard
last octet = 229112816413201608140211networkhost

A host has the address 10.20.241.229/25. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.241.229/25
x =
6.Hard
third octet = 184112806413211618040201networkhost

A host has the address 172.20.184.70/17. What is the third octet x of its subnet's broadcast address?

172.20.184.70/17
x =

Answer key

  1. 1. H = 14
  2. 2. H = 254
  3. 3. H = 2046
  4. 4. x = 192
  5. 5. x = 255
  6. 6. x = 255

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