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
/2711111111111111111111111111100000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /27?

/27
H =
2.Easy
fourth octet of /26112816403201608040201oneszeros

Write the subnet mask of a /26 network in dotted-decimal notation. What is the value x of its fourth octet?

/26
x =
3.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 3 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/243 subnets
H =
4.Medium
/20 → /2411111111111111111111111100000000network bitshost bits

The network 10.30.16.0/20 is divided into equal subnets with prefix /24. How many subnets N are there?

10.30.16.0/20/24
N =
5.Hard
third octet = 89012816403211618040211networkhost

A host has the address 172.20.89.121/19. What is the third octet x of its network address?

172.20.89.121/19
x =
6.Hard

The network 192.168.35.0/24 is split with VLSM for these LANs: A: 29 hosts, B: 10 hosts, C: 5 hosts, D: 19 hosts, E: 4 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: 29B: 10C: 5D: 19E: 4
x =

Answer key

  1. 1. H = 30
  2. 2. x = 192
  3. 3. H = 62
  4. 4. N = 16
  5. 5. x = 64
  6. 6. x = 64

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