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
/3011111111111111111111111111111100network bitshost bits

An access list must match the network 192.168.1.0/30. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/30
x =
3.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 12 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2412 subnets
H =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 10.63.51.0/24 is divided into equal subnets with prefix /26. How many subnets N are there?

10.63.51.0/24/26
N =
5.Hard
third octet 23 … 28012806403211608141211commonvaries

A router has routes to these networks: 10.146.23.0/24, 10.146.24.0/24, 10.146.25.0/24, 10.146.26.0/24, 10.146.27.0/24, 10.146.28.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.146.23.0/24 … 10.146.28.0/24
p =
6.Hard
last octet = 105012816413201618040211networkhost

A host has the address 10.20.107.105/27. What is the fourth octet x of its network address?

10.20.107.105/27
x =

Answer key

  1. 1. H = 254
  2. 2. x = 3
  3. 3. H = 14
  4. 4. N = 4
  5. 5. p = 20
  6. 6. x = 96

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