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
/2611111111111111111111111111000000network bitshost bits

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

/26
H =
3.Medium
/20 → /2311111111111111111111111000000000network bitshost bits

The network 10.115.144.0/20 is divided into equal subnets with prefix /23. How many subnets N are there?

10.115.144.0/20/23
N =
4.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 16 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2416 subnets
H =
5.Hard

The network 192.168.214.0/24 is split with VLSM for these LANs: A: 12 hosts, B: 25 hosts, C: 21 hosts, D: 5 hosts, E: 51 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: 12B: 25C: 21D: 5E: 51
x =
6.Hard
last octet = 26012806403211618041201networkhost

A host has the address 10.20.243.26/27. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.243.26/27
x =

Answer key

  1. 1. H = 510
  2. 2. H = 62
  3. 3. N = 8
  4. 4. H = 14
  5. 5. x = 128
  6. 6. x = 31

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