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
third octet of /21112816413211618040201oneszeros

Write the subnet mask of a /21 network in dotted-decimal notation. What is the value x of its third octet?

/21
x =
3.Medium
/22 → /2911111111111111111111111111111000network bitshost bits

The network 10.59.68.0/22 is divided into equal subnets with prefix /29. How many subnets N are there?

10.59.68.0/22/29
N =
4.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 =
5.Hard

The network 192.168.203.0/24 is split with VLSM for these LANs: A: 46 hosts, B: 4 hosts, C: 14 hosts, D: 76 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: 46B: 4C: 14D: 76
x =
6.Hard
last octet = 38012806413201608141201networkhost

A host has the address 10.20.42.38/29. What is the fourth octet x of the last usable host address in its subnet?

10.20.42.38/29
x =

Answer key

  1. 1. H = 6
  2. 2. x = 248
  3. 3. N = 128
  4. 4. H = 30
  5. 5. x = 192
  6. 6. x = 38

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