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
/2211111111111111111111110000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /22?

/22
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1809 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1809 hosts
p =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 30 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2430 subnets
H =
5.Hard
last octet = 131112806403201608041211networkhost

A host has the address 10.20.248.131/28. What is the fourth octet x of the last usable host address in its subnet?

10.20.248.131/28
x =
6.Hard
last octet = 99012816413201608041211networkhost

A host has the address 10.20.220.99/30. What is the fourth octet x of its network address?

10.20.220.99/30
x =

Answer key

  1. 1. H = 6
  2. 2. H = 1022
  3. 3. p = 21
  4. 4. H = 6
  5. 5. x = 142
  6. 6. x = 96

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