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
255.255.254.011111111111111111111111000000000network bitshost bits

A subnet has the mask 255.255.254.0. What is its prefix length p?

255.255.254.0
p =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1873 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1873 hosts
p =
4.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1964 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1964 hosts
p =
5.Hard
last octet = 114012816413211608041201networkhost

A host has the address 10.20.45.114/30. What is the fourth octet x of its network address?

10.20.45.114/30
x =
6.Hard
last octet = 237112816413201618140211networkhost

A host has the address 10.20.53.237/29. What is the fourth octet x of the last usable host address in its subnet?

10.20.53.237/29
x =

Answer key

  1. 1. H = 30
  2. 2. p = 23
  3. 3. p = 21
  4. 4. p = 21
  5. 5. x = 112
  6. 6. x = 238

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