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
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
2.Easy
/2211111111111111111111110000000000network bitshost bits

An access list must match the network 172.16.0.0/22. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/22
x =
3.Medium
/24 → /2511111111111111111111111110000000network bitshost bits

The network 192.168.6.0/24 is divided into /25 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the network address of subnet 2?

192.168.6.0/24/25subnet 2 (subnet 1 starts at .0)
x =
4.Medium
255.255.252.011111111111111111111110000000000network bitshost bits

A subnet uses the mask 255.255.252.0. How many usable host addresses H does it have?

255.255.252.0
H =
5.Hard
third octet = 244112816413211608140201networkhost

A host has the address 172.20.244.82/22. What is the third octet x of its subnet's broadcast address?

172.20.244.82/22
x =
6.Hard
third octet = 102012816413201608141201networkhost

A host has the address 172.20.102.250/20. What is the third octet x of its subnet's broadcast address?

172.20.102.250/20
x =

Answer key

  1. 1. H = 62
  2. 2. x = 3
  3. 3. x = 128
  4. 4. H = 1022
  5. 5. x = 247
  6. 6. x = 111

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