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
/2311111111111111111111111000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /23?

/23
H =
3.Medium
/22 → /2511111111111111111111111110000000network bitshost bits

The network 10.251.212.0/22 is divided into equal subnets with prefix /25. How many subnets N are there?

10.251.212.0/22/25
N =
4.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1577 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1577 hosts
p =
5.Hard
last octet = 241112816413211608040211networkhost

A host has the address 10.20.43.241/29. What is the fourth octet x of the last usable host address in its subnet?

10.20.43.241/29
x =
6.Hard
last octet = 119012816413211608141211networkhost

A host has the address 10.20.131.119/25. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.131.119/25
x =

Answer key

  1. 1. x = 7
  2. 2. H = 510
  3. 3. N = 8
  4. 4. p = 21
  5. 5. x = 246
  6. 6. x = 127

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