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
/2511111111111111111111111110000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /25?

/25
H =
2.Easy
third octet of /19112816413201608040201oneszeros

Write the subnet mask of a /19 network in dotted-decimal notation. What is the value x of its third octet?

/19
x =
3.Medium
/20 → /2211111111111111111111110000000000network bitshost bits

The network 10.35.64.0/20 is divided into equal subnets with prefix /22. How many subnets N are there?

10.35.64.0/20/22
N =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 3 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/243 subnets
H =
5.Hard
last octet = 55012806413211608141211networkhost

A host has the address 10.20.68.55/26. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.68.55/26
x =
6.Hard
last octet = 96012816413201608040201networkhost

A host has the address 10.20.216.96/28. What is the fourth octet x of the last usable host address in its subnet?

10.20.216.96/28
x =

Answer key

  1. 1. H = 126
  2. 2. x = 224
  3. 3. N = 4
  4. 4. H = 62
  5. 5. x = 63
  6. 6. x = 110

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