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
fourth octet of /29112816413211618040201oneszeros

Write the subnet mask of a /29 network in dotted-decimal notation. What is the value x of its fourth octet?

/29
x =
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 8 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/248 subnets
H =
4.Medium
/20 → /2411111111111111111111111100000000network bitshost bits

The network 10.237.0.0/20 is divided into equal subnets with prefix /24. How many subnets N are there?

10.237.0.0/20/24
N =
5.Hard
last octet = 66012816403201608041201networkhost

A host has the address 10.20.222.66/26. What is the fourth octet x of its network address?

10.20.222.66/26
x =
6.Hard
last octet = 78012816403201618141201networkhost

A host has the address 10.20.9.78/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.9.78/29
x =

Answer key

  1. 1. x = 248
  2. 2. H = 1022
  3. 3. H = 30
  4. 4. N = 16
  5. 5. x = 64
  6. 6. x = 79

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