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
255.255.252.011111111111111111111110000000000network bitshost bits

A subnet has the mask 255.255.252.0. What is its prefix length p?

255.255.252.0
p =
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
255.255.255.24011111111111111111111111111110000network bitshost bits

A subnet uses the mask 255.255.255.240. How many usable host addresses H does it have?

255.255.255.240
H =
5.Hard

The network 192.168.19.0/24 is split with VLSM for these LANs: A: 17 hosts, B: 19 hosts, C: 3 hosts, D: 10 hosts, E: 32 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: 17B: 19C: 3D: 10E: 32
x =
6.Hard
last octet = 144112806403211608040201networkhost

A host has the address 10.20.25.144/27. What is the fourth octet x of its network address?

10.20.25.144/27
x =

Answer key

  1. 1. H = 6
  2. 2. p = 22
  3. 3. H = 2
  4. 4. H = 14
  5. 5. x = 64
  6. 6. x = 128

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