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
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
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
/?11111111111111111111100000000000network bitshost bits

A department needs 1135 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1135 hosts
p =
5.Hard
last octet = 128112806403201608040201networkhost

A host has the address 10.20.132.128/28. What is the fourth octet x of its network address?

10.20.132.128/28
x =
6.Hard
last octet = 159112806403211618141211networkhost

A host has the address 10.20.35.159/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.35.159/29
x =

Answer key

  1. 1. H = 14
  2. 2. H = 62
  3. 3. H = 4094
  4. 4. p = 21
  5. 5. x = 128
  6. 6. x = 159

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