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
/2711111111111111111111111111100000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /27?

/27
H =
2.Easy
255.255.255.12811111111111111111111111110000000network bitshost bits

A subnet has the mask 255.255.255.128. What is its prefix length p?

255.255.255.128
p =
3.Medium
255.255.255.19211111111111111111111111111000000network bitshost bits

A subnet uses the mask 255.255.255.192. How many usable host addresses H does it have?

255.255.255.192
H =
4.Medium
255.255.254.011111111111111111111111000000000network bitshost bits

A subnet uses the mask 255.255.254.0. How many usable host addresses H does it have?

255.255.254.0
H =
5.Hard
last octet = 28012806403211618140201networkhost

A host has the address 10.20.255.28/26. What is the fourth octet x of the last usable host address in its subnet?

10.20.255.28/26
x =
6.Hard
last octet = 110012816413201618141201networkhost

A host has the address 10.20.126.110/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.126.110/29
x =

Answer key

  1. 1. H = 30
  2. 2. p = 25
  3. 3. H = 62
  4. 4. H = 510
  5. 5. x = 62
  6. 6. x = 111

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