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
255.255.254.011111111111111111111111000000000network bitshost bits

A subnet has the mask 255.255.254.0. What is its prefix length p?

255.255.254.0
p =
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 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 4 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/244 subnets
H =
4.Medium
/20 → /2411111111111111111111111100000000network bitshost bits

The network 10.60.112.0/20 is divided into equal subnets with prefix /24. How many subnets N are there?

10.60.112.0/20/24
N =
5.Hard
last octet = 249112816413211618040211networkhost

A host has the address 10.20.252.249/27. What is the fourth octet x of the last usable host address in its subnet?

10.20.252.249/27
x =
6.Hard
third octet = 207112816403201618141211networkhost

A host has the address 172.20.207.118/22. What is the third octet x of its network address?

172.20.207.118/22
x =

Answer key

  1. 1. p = 23
  2. 2. x = 3
  3. 3. H = 62
  4. 4. N = 16
  5. 5. x = 254
  6. 6. x = 204

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