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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1.Easy
/2911111111111111111111111111111000network bitshost bits

An access list must match the network 192.168.1.0/29. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/29
x =
2.Easy
/2211111111111111111111110000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /22?

/22
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1633 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1633 hosts
p =
4.Medium
/20 → /2611111111111111111111111111000000network bitshost bits

The network 10.190.32.0/20 is divided into equal subnets with prefix /26. How many subnets N are there?

10.190.32.0/20/26
N =
5.Hard
third octet = 171112806413201618041211networkhost

A host has the address 172.20.171.184/19. What is the third octet x of its network address?

172.20.171.184/19
x =
6.Hard
last octet = 123012816413211618041211networkhost

A host has the address 10.20.222.123/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.222.123/30
x =

Answer key

  1. 1. x = 7
  2. 2. H = 1022
  3. 3. p = 21
  4. 4. N = 64
  5. 5. x = 160
  6. 6. x = 123

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