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
fourth octet of /25112806403201608040201oneszeros

Write the subnet mask of a /25 network in dotted-decimal notation. What is the value x of its fourth octet?

/25
x =
3.Medium
255.255.255.22411111111111111111111111111100000network bitshost bits

A subnet uses the mask 255.255.255.224. How many usable host addresses H does it have?

255.255.255.224
H =
4.Medium
255.255.252.011111111111111111111110000000000network bitshost bits

A subnet uses the mask 255.255.252.0. How many usable host addresses H does it have?

255.255.252.0
H =
5.Hard
last octet = 74012816403201618041201networkhost

A host has the address 10.20.159.74/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.159.74/30
x =
6.Hard

The network 192.168.155.0/24 is split with VLSM for these LANs: A: 32 hosts, B: 5 hosts, C: 11 hosts, D: 13 hosts, E: 24 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 C?

A: 32B: 5C: 11D: 13E: 24
x =

Answer key

  1. 1. H = 126
  2. 2. x = 128
  3. 3. H = 30
  4. 4. H = 1022
  5. 5. x = 75
  6. 6. x = 112

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