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
/2411111111111111111111111100000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /24?

/24
H =
2.Easy
255.255.255.12811111111111111111111111110000000network bitshost bits

A subnet has the mask 255.255.255.128. What is its prefix length p?

255.255.255.128
p =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1802 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1802 hosts
p =
4.Medium
255.255.252.011111111111111111111110000000000network bitshost bits

A subnet uses the mask 255.255.252.0. How many usable host addresses H does it have?

255.255.252.0
H =
5.Hard
third octet 211 … 214112816403211608041211commonvaries

A router has routes to these networks: 10.180.211.0/24, 10.180.212.0/24, 10.180.213.0/24, 10.180.214.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.180.211.0/24 … 10.180.214.0/24
p =
6.Hard
last octet = 228112816413201608140201networkhost

A host has the address 10.20.149.228/28. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.149.228/28
x =

Answer key

  1. 1. H = 254
  2. 2. p = 25
  3. 3. p = 21
  4. 4. H = 1022
  5. 5. p = 21
  6. 6. x = 239

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