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
/2911111111111111111111111111111000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /29?

/29
H =
2.Easy
/2711111111111111111111111111100000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /27?

/27
H =
3.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 6 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/246 subnets
H =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 20 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2420 subnets
H =
5.Hard
third octet 138 … 140112806403201618041201commonvaries

A router has routes to these networks: 10.73.138.0/24, 10.73.139.0/24, 10.73.140.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.73.138.0/24 … 10.73.140.0/24
p =
6.Hard
last octet = 226112816413201608041201networkhost

A host has the address 10.20.159.226/26. What is the fourth octet x of the last usable host address in its subnet?

10.20.159.226/26
x =

Answer key

  1. 1. H = 6
  2. 2. H = 30
  3. 3. H = 30
  4. 4. H = 6
  5. 5. p = 21
  6. 6. x = 254

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