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
/2111111111111111111111100000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /21?

/21
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1701 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1701 hosts
p =
4.Medium
/16 → /1911111111111111111110000000000000network bitshost bits

The network 172.27.0.0/16 is divided into equal subnets with prefix /19. How many subnets N are there?

172.27.0.0/16/19
N =
5.Hard
third octet = 188112806413211618140201networkhost

A host has the address 172.20.188.104/19. What is the third octet x of its network address?

172.20.188.104/19
x =
6.Hard
third octet = 0012806403201608040201networkhost

A host has the address 172.20.0.206/23. What is the third octet x of its subnet's broadcast address?

172.20.0.206/23
x =

Answer key

  1. 1. H = 30
  2. 2. H = 2046
  3. 3. p = 21
  4. 4. N = 8
  5. 5. x = 160
  6. 6. x = 1

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