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
/2211111111111111111111110000000000network bitshost bits

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

/22
H =
3.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 6 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/246 subnets
H =
4.Medium
/22 → /2711111111111111111111111111100000network bitshost bits

The network 10.127.0.0/22 is divided into equal subnets with prefix /27. How many subnets N are there?

10.127.0.0/22/27
N =
5.Hard
last octet = 72012816403201618040201networkhost

A host has the address 10.20.44.72/29. What is the fourth octet x of the last usable host address in its subnet?

10.20.44.72/29
x =
6.Hard
last octet = 234112816413201618041201networkhost

A host has the address 10.20.12.234/25. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.12.234/25
x =

Answer key

  1. 1. H = 126
  2. 2. H = 1022
  3. 3. H = 30
  4. 4. N = 32
  5. 5. x = 78
  6. 6. x = 255

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