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
third octet of /22112816413211618140201oneszeros

Write the subnet mask of a /22 network in dotted-decimal notation. What is the value x of its third octet?

/22
x =
2.Easy
255.255.255.25211111111111111111111111111111100network bitshost bits

A subnet has the mask 255.255.255.252. What is its prefix length p?

255.255.255.252
p =
3.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 5 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/245 subnets
H =
4.Medium
255.255.255.12811111111111111111111111110000000network bitshost bits

A subnet uses the mask 255.255.255.128. How many usable host addresses H does it have?

255.255.255.128
H =
5.Hard
last octet = 224112816413201608040201networkhost

A host has the address 10.20.25.224/30. What is the fourth octet x of the last usable host address in its subnet?

10.20.25.224/30
x =
6.Hard
third octet = 42012806413201618041201networkhost

A host has the address 172.20.42.25/18. What is the third octet x of its subnet's broadcast address?

172.20.42.25/18
x =

Answer key

  1. 1. x = 252
  2. 2. p = 30
  3. 3. H = 30
  4. 4. H = 126
  5. 5. x = 226
  6. 6. x = 63

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