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
/2011111111111111111111000000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /20?

/20
H =
2.Easy
/2511111111111111111111111110000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /25?

/25
H =
3.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 968 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

968 hosts
p =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 5 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/245 subnets
H =
5.Hard
third octet 119 … 124012816413211608141211commonvaries

A router has routes to these networks: 10.67.119.0/24, 10.67.120.0/24, 10.67.121.0/24, 10.67.122.0/24, 10.67.123.0/24, 10.67.124.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.67.119.0/24 … 10.67.124.0/24
p =
6.Hard
third octet 229 … 234112816413201608140211commonvaries

A router has routes to these networks: 10.41.229.0/24, 10.41.230.0/24, 10.41.231.0/24, 10.41.232.0/24, 10.41.233.0/24, 10.41.234.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.41.229.0/24 … 10.41.234.0/24
p =

Answer key

  1. 1. H = 4094
  2. 2. H = 126
  3. 3. p = 22
  4. 4. H = 30
  5. 5. p = 20
  6. 6. p = 20

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