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
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
2.Easy
/2411111111111111111111111100000000network bitshost bits

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

/24
H =
3.Medium
/16 → /2411111111111111111111111100000000network bitshost bits

The network 172.18.0.0/16 is divided into equal subnets with prefix /24. How many subnets N are there?

172.18.0.0/16/24
N =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 10.94.146.0/24 is divided into equal subnets with prefix /26. How many subnets N are there?

10.94.146.0/24/26
N =
5.Hard
third octet = 234112816413201618041201networkhost

A host has the address 172.20.234.215/19. What is the third octet x of its subnet's broadcast address?

172.20.234.215/19
x =
6.Hard

The network 192.168.129.0/24 is split with VLSM for these LANs: A: 13 hosts, B: 43 hosts, C: 18 hosts, D: 85 hosts. Subnets are allocated from .0 upwards, the LAN with the most hosts first, each with the smallest subnet that fits. What is the fourth octet x of the network address of LAN B?

A: 13B: 43C: 18D: 85
x =

Answer key

  1. 1. H = 62
  2. 2. H = 254
  3. 3. N = 256
  4. 4. N = 4
  5. 5. x = 255
  6. 6. x = 128

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