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
/1811111111111111111100000000000000network bitshost bits

An access list must match the network 172.16.0.0/18. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/18
x =
2.Easy
/2111111111111111111111100000000000network bitshost bits

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

/21
H =
3.Medium
/22 → /2711111111111111111111111111100000network bitshost bits

The network 10.133.232.0/22 is divided into equal subnets with prefix /27. How many subnets N are there?

10.133.232.0/22/27
N =
4.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1204 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1204 hosts
p =
5.Hard
last octet = 52012806413211608140201networkhost

A host has the address 10.20.131.52/28. What is the fourth octet x of the last usable host address in its subnet?

10.20.131.52/28
x =
6.Hard
last octet = 245112816413211608140211networkhost

A host has the address 10.20.237.245/27. What is the fourth octet x of its network address?

10.20.237.245/27
x =

Answer key

  1. 1. x = 63
  2. 2. H = 2046
  3. 3. N = 32
  4. 4. p = 21
  5. 5. x = 62
  6. 6. x = 224

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