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
/2311111111111111111111111000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /23?

/23
H =
2.Easy
fourth octet of /28112816413211608040201oneszeros

Write the subnet mask of a /28 network in dotted-decimal notation. What is the value x of its fourth octet?

/28
x =
3.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 10 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2410 subnets
H =
4.Medium
255.255.255.19211111111111111111111111111000000network bitshost bits

A subnet uses the mask 255.255.255.192. How many usable host addresses H does it have?

255.255.255.192
H =
5.Hard
last octet = 56012806413211618040201networkhost

A host has the address 10.20.65.56/27. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.65.56/27
x =
6.Hard
third octet 204 … 205112816403201618140201commonvaries

A router has routes to these networks: 10.129.204.0/24, 10.129.205.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.129.204.0/24 … 10.129.205.0/24
p =

Answer key

  1. 1. H = 510
  2. 2. x = 240
  3. 3. H = 14
  4. 4. H = 62
  5. 5. x = 63
  6. 6. p = 23

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