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
/2311111111111111111111111000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /23?

/23
H =
2.Easy
third octet of /23112816413211618141201oneszeros

Write the subnet mask of a /23 network in dotted-decimal notation. What is the value x of its third octet?

/23
x =
3.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 =
4.Medium
255.255.240.011111111111111111111000000000000network bitshost bits

A subnet uses the mask 255.255.240.0. How many usable host addresses H does it have?

255.255.240.0
H =
5.Hard
third octet 219 … 220112816403211618041211commonvaries

A router has routes to these networks: 10.62.219.0/24, 10.62.220.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.62.219.0/24 … 10.62.220.0/24
p =
6.Hard

The network 192.168.167.0/24 is split with VLSM for these LANs: A: 10 hosts, B: 36 hosts, C: 23 hosts, D: 16 hosts, E: 6 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: 10B: 36C: 23D: 16E: 6
x =

Answer key

  1. 1. H = 510
  2. 2. x = 254
  3. 3. H = 2046
  4. 4. H = 4094
  5. 5. p = 21
  6. 6. x = 96

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