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
255.255.254.011111111111111111111111000000000network bitshost bits

A subnet has the mask 255.255.254.0. What is its prefix length p?

255.255.254.0
p =
2.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 =
3.Medium
/16 → /2111111111111111111111100000000000network bitshost bits

The network 172.30.0.0/16 is divided into equal subnets with prefix /21. How many subnets N are there?

172.30.0.0/16/21
N =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.61.0/24 is divided into /27 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the broadcast address of subnet 5?

192.168.61.0/24/27subnet 5 (subnet 1 starts at .0)
x =
5.Hard
last octet = 197112816403201608140211networkhost

A host has the address 10.20.110.197/27. What is the fourth octet x of its network address?

10.20.110.197/27
x =
6.Hard
last octet = 241112816413211608040211networkhost

A host has the address 10.20.143.241/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.143.241/30
x =

Answer key

  1. 1. p = 23
  2. 2. x = 254
  3. 3. N = 32
  4. 4. x = 159
  5. 5. x = 192
  6. 6. x = 243

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