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
/2711111111111111111111111111100000network bitshost bits

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

/27
H =
3.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 991 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

991 hosts
p =
4.Medium
/?11111111111111111111111100000000network bitshost bits

A department needs 233 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

233 hosts
p =
5.Hard
last octet = 54012806413211608141201networkhost

A host has the address 10.20.213.54/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.213.54/29
x =
6.Hard
last octet = 132112806403201608140201networkhost

A host has the address 10.20.154.132/28. What is the fourth octet x of its network address?

10.20.154.132/28
x =

Answer key

  1. 1. H = 14
  2. 2. H = 30
  3. 3. p = 22
  4. 4. p = 24
  5. 5. x = 55
  6. 6. x = 128

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