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
/2311111111111111111111111000000000network bitshost bits

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

/23
H =
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 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 16 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2416 subnets
H =
5.Hard
last octet = 72012816403201618040201networkhost

A host has the address 10.20.8.72/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.8.72/30
x =
6.Hard
last octet = 80012816403211608040201networkhost

A host has the address 10.20.223.80/26. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.223.80/26
x =

Answer key

  1. 1. H = 2046
  2. 2. H = 510
  3. 3. H = 6
  4. 4. H = 14
  5. 5. x = 75
  6. 6. x = 127

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