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
/2911111111111111111111111111111000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /29?

/29
H =
2.Easy
255.255.240.011111111111111111111000000000000network bitshost bits

A subnet has the mask 255.255.240.0. What is its prefix length p?

255.255.240.0
p =
3.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 3 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/243 subnets
H =
4.Medium
/16 → /2411111111111111111111111100000000network bitshost bits

The network 172.27.0.0/16 is divided into equal subnets with prefix /24. How many subnets N are there?

172.27.0.0/16/24
N =
5.Hard
last octet = 100012816413201608140201networkhost

A host has the address 10.20.242.100/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.242.100/29
x =
6.Hard
third octet 158 … 161112806403211618141201commonvaries

A router has routes to these networks: 10.71.158.0/24, 10.71.159.0/24, 10.71.160.0/24, 10.71.161.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.71.158.0/24 … 10.71.161.0/24
p =

Answer key

  1. 1. H = 6
  2. 2. p = 20
  3. 3. H = 62
  4. 4. N = 256
  5. 5. x = 103
  6. 6. p = 18

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