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
/2811111111111111111111111111110000network bitshost bits

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

/28
H =
2.Easy
third octet of /19112816413201608040201oneszeros

Write the subnet mask of a /19 network in dotted-decimal notation. What is the value x of its third octet?

/19
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
255.255.248.011111111111111111111100000000000network bitshost bits

A subnet uses the mask 255.255.248.0. How many usable host addresses H does it have?

255.255.248.0
H =
5.Hard
last octet = 189112806413211618140211networkhost

A host has the address 10.20.59.189/27. What is the fourth octet x of the last usable host address in its subnet?

10.20.59.189/27
x =
6.Hard

The network 192.168.221.0/24 is split with VLSM for these LANs: A: 54 hosts, B: 8 hosts, C: 5 hosts, D: 65 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 A?

A: 54B: 8C: 5D: 65
x =

Answer key

  1. 1. H = 14
  2. 2. x = 224
  3. 3. H = 30
  4. 4. H = 2046
  5. 5. x = 190
  6. 6. x = 128

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