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
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1525 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1525 hosts
p =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 8 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/248 subnets
H =
5.Hard
last octet = 127012816413211618141211networkhost

A host has the address 10.20.178.127/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.178.127/29
x =
6.Hard

The network 192.168.115.0/24 is split with VLSM for these LANs: A: 17 hosts, B: 39 hosts, C: 8 hosts, D: 4 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: 17B: 39C: 8D: 4E: 24
x =

Answer key

  1. 1. H = 126
  2. 2. H = 62
  3. 3. p = 21
  4. 4. H = 30
  5. 5. x = 127
  6. 6. x = 128

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