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
/2511111111111111111111111110000000network bitshost bits

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

/25
H =
2.Easy
/2811111111111111111111111111110000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /28?

/28
H =
3.Medium
/16 → /1911111111111111111110000000000000network bitshost bits

The network 172.31.0.0/16 is divided into equal subnets with prefix /19. How many subnets N are there?

172.31.0.0/16/19
N =
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
last octet = 218112816403211618041201networkhost

A host has the address 10.20.131.218/29. What is the fourth octet x of its network address?

10.20.131.218/29
x =
6.Hard

The network 192.168.241.0/24 is split with VLSM for these LANs: A: 17 hosts, B: 33 hosts, C: 54 hosts, D: 9 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: 17B: 33C: 54D: 9
x =

Answer key

  1. 1. H = 126
  2. 2. H = 14
  3. 3. N = 8
  4. 4. H = 6
  5. 5. x = 216
  6. 6. x = 160

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