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
/2811111111111111111111111111110000network bitshost bits

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

/28
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
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 16 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2416 subnets
H =
4.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1546 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1546 hosts
p =
5.Hard
third octet = 185112806413211618040211networkhost

A host has the address 172.20.185.82/18. What is the third octet x of its subnet's broadcast address?

172.20.185.82/18
x =
6.Hard
last octet = 117012816413211608140211networkhost

A host has the address 10.20.234.117/27. What is the fourth octet x of its network address?

10.20.234.117/27
x =

Answer key

  1. 1. H = 14
  2. 2. H = 1022
  3. 3. H = 14
  4. 4. p = 21
  5. 5. x = 191
  6. 6. x = 96

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