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
/2111111111111111111111100000000000network bitshost bits

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

/21
H =
2.Easy
/2511111111111111111111111110000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /25?

/25
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1153 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1153 hosts
p =
4.Medium
255.255.255.25211111111111111111111111111111100network bitshost bits

A subnet uses the mask 255.255.255.252. How many usable host addresses H does it have?

255.255.255.252
H =
5.Hard
third octet = 85012816403211608140211networkhost

A host has the address 172.20.85.254/19. What is the third octet x of its network address?

172.20.85.254/19
x =
6.Hard
last octet = 113012816413211608040211networkhost

A host has the address 10.20.133.113/27. What is the fourth octet x of its network address?

10.20.133.113/27
x =

Answer key

  1. 1. H = 2046
  2. 2. H = 126
  3. 3. p = 21
  4. 4. H = 2
  5. 5. x = 64
  6. 6. x = 96

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