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
third octet of /23112816413211618141201oneszeros

Write the subnet mask of a /23 network in dotted-decimal notation. What is the value x of its third octet?

/23
x =
2.Easy
third octet of /22112816413211618140201oneszeros

Write the subnet mask of a /22 network in dotted-decimal notation. What is the value x of its third octet?

/22
x =
3.Medium
255.255.248.011111111111111111111100000000000network bitshost bits

A subnet uses the mask 255.255.248.0. How many usable host addresses H does it have?

255.255.248.0
H =
4.Medium
/20 → /2811111111111111111111111111110000network bitshost bits

The network 10.139.80.0/20 is divided into equal subnets with prefix /28. How many subnets N are there?

10.139.80.0/20/28
N =
5.Hard
last octet = 215112816403211608141211networkhost

A host has the address 10.20.171.215/28. What is the fourth octet x of the last usable host address in its subnet?

10.20.171.215/28
x =
6.Hard
third octet = 172112806413201618140201networkhost

A host has the address 172.20.172.76/23. What is the third octet x of its subnet's broadcast address?

172.20.172.76/23
x =

Answer key

  1. 1. x = 254
  2. 2. x = 252
  3. 3. H = 2046
  4. 4. N = 256
  5. 5. x = 222
  6. 6. x = 173

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