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
/2111111111111111111111100000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /21?

/21
H =
2.Easy
fourth octet of /26112816403201608040201oneszeros

Write the subnet mask of a /26 network in dotted-decimal notation. What is the value x of its fourth octet?

/26
x =
3.Medium
255.255.248.011111111111111111111100000000000network bitshost bits

A subnet uses the mask 255.255.248.0. How many usable host addresses H does it have?

255.255.248.0
H =
4.Medium
255.255.240.011111111111111111111000000000000network bitshost bits

A subnet uses the mask 255.255.240.0. How many usable host addresses H does it have?

255.255.240.0
H =
5.Hard
third octet = 131112806403201608041211networkhost

A host has the address 172.20.131.16/20. What is the third octet x of its network address?

172.20.131.16/20
x =
6.Hard
third octet = 40012806413201618040201networkhost

A host has the address 172.20.40.1/17. What is the third octet x of its subnet's broadcast address?

172.20.40.1/17
x =

Answer key

  1. 1. H = 2046
  2. 2. x = 192
  3. 3. H = 2046
  4. 4. H = 4094
  5. 5. x = 128
  6. 6. x = 127

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