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
255.255.255.24011111111111111111111111111110000network bitshost bits

A subnet has the mask 255.255.255.240. What is its prefix length p?

255.255.255.240
p =
2.Easy
third octet of /17112806403201608040201oneszeros

Write the subnet mask of a /17 network in dotted-decimal notation. What is the value x of its third octet?

/17
x =
3.Medium
255.255.255.24811111111111111111111111111111000network bitshost bits

A subnet uses the mask 255.255.255.248. How many usable host addresses H does it have?

255.255.255.248
H =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 30 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2430 subnets
H =
5.Hard
third octet = 71012816403201608141211networkhost

A host has the address 172.20.71.5/18. What is the third octet x of its network address?

172.20.71.5/18
x =
6.Hard
last octet = 223112816403211618141211networkhost

A host has the address 10.20.51.223/27. What is the fourth octet x of its network address?

10.20.51.223/27
x =

Answer key

  1. 1. p = 28
  2. 2. x = 128
  3. 3. H = 6
  4. 4. H = 6
  5. 5. x = 64
  6. 6. x = 192

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