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 /27112816413201608040201oneszeros

Write the subnet mask of a /27 network in dotted-decimal notation. What is the value x of its fourth octet?

/27
x =
2.Easy
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
3.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.7.0/24 is divided into /28 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 4?

192.168.7.0/24/28subnet 4 (subnet 1 starts at .0)
x =
4.Medium
255.255.252.011111111111111111111110000000000network bitshost bits

A subnet uses the mask 255.255.252.0. How many usable host addresses H does it have?

255.255.252.0
H =
5.Hard
last octet = 12012806403201618140201networkhost

A host has the address 10.20.70.12/27. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.70.12/27
x =
6.Hard
last octet = 64012816403201608040201networkhost

A host has the address 10.20.159.64/29. What is the fourth octet x of its network address?

10.20.159.64/29
x =

Answer key

  1. 1. x = 224
  2. 2. H = 62
  3. 3. x = 48
  4. 4. H = 1022
  5. 5. x = 31
  6. 6. x = 64

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