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
255.255.240.011111111111111111111000000000000network bitshost bits

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

255.255.240.0
p =
2.Easy
/2811111111111111111111111111110000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /28?

/28
H =
3.Medium
/?11111111111111111111111100000000network bitshost bits

A department needs 227 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

227 hosts
p =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 5 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/245 subnets
H =
5.Hard
third octet 113 … 117012816413211608040211commonvaries

A router has routes to these networks: 10.132.113.0/24, 10.132.114.0/24, 10.132.115.0/24, 10.132.116.0/24, 10.132.117.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.132.113.0/24 … 10.132.117.0/24
p =
6.Hard
last octet = 219112816403211618041211networkhost

A host has the address 10.20.189.219/28. What is the fourth octet x of its network address?

10.20.189.219/28
x =

Answer key

  1. 1. p = 20
  2. 2. H = 14
  3. 3. p = 24
  4. 4. H = 30
  5. 5. p = 21
  6. 6. x = 208

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