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
255.255.255.19211111111111111111111111111000000network bitshost bits

A subnet has the mask 255.255.255.192. What is its prefix length p?

255.255.255.192
p =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1378 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1378 hosts
p =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.76.0/24 is divided into /27 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the network address of subnet 7?

192.168.76.0/24/27subnet 7 (subnet 1 starts at .0)
x =
5.Hard
last octet = 190112806413211618141201networkhost

A host has the address 10.20.114.190/28. What is the fourth octet x of its network address?

10.20.114.190/28
x =
6.Hard
third octet = 169112806413201618040211networkhost

A host has the address 172.20.169.175/23. What is the third octet x of its subnet's broadcast address?

172.20.169.175/23
x =

Answer key

  1. 1. H = 14
  2. 2. p = 26
  3. 3. p = 21
  4. 4. x = 192
  5. 5. x = 176
  6. 6. x = 169

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