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
/2211111111111111111111110000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /22?

/22
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
255.255.255.25211111111111111111111111111111100network bitshost bits

A subnet uses the mask 255.255.255.252. How many usable host addresses H does it have?

255.255.255.252
H =
4.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1579 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1579 hosts
p =
5.Hard
third octet = 68012816403201608140201networkhost

A host has the address 172.20.68.191/22. What is the third octet x of its network address?

172.20.68.191/22
x =
6.Hard

The network 192.168.102.0/24 is split with VLSM for these LANs: A: 117 hosts, B: 22 hosts, C: 21 hosts, D: 5 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 D?

A: 117B: 22C: 21D: 5
x =

Answer key

  1. 1. H = 1022
  2. 2. H = 126
  3. 3. H = 2
  4. 4. p = 21
  5. 5. x = 68
  6. 6. x = 192

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