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
/2311111111111111111111111000000000network bitshost bits

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

/23
H =
2.Easy
/2911111111111111111111111111111000network bitshost bits

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

/29
H =
3.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 8 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/248 subnets
H =
4.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 964 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

964 hosts
p =
5.Hard
last octet = 242112816413211608041201networkhost

A host has the address 10.20.206.242/26. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.206.242/26
x =
6.Hard
third octet 74 … 77012816403201618041201commonvaries

A router has routes to these networks: 10.114.74.0/24, 10.114.75.0/24, 10.114.76.0/24, 10.114.77.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.114.74.0/24 … 10.114.77.0/24
p =

Answer key

  1. 1. H = 510
  2. 2. H = 6
  3. 3. H = 30
  4. 4. p = 22
  5. 5. x = 255
  6. 6. p = 21

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