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
255.255.255.12811111111111111111111111110000000network bitshost bits

A subnet has the mask 255.255.255.128. What is its prefix length p?

255.255.255.128
p =
2.Easy
/2411111111111111111111111100000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /24?

/24
H =
3.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 721 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

721 hosts
p =
4.Medium
/16 → /2311111111111111111111111000000000network bitshost bits

The network 172.17.0.0/16 is divided into equal subnets with prefix /23. How many subnets N are there?

172.17.0.0/16/23
N =
5.Hard
last octet = 193112816403201608040211networkhost

A host has the address 10.20.104.193/28. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.104.193/28
x =
6.Hard

The network 192.168.63.0/24 is split with VLSM for these LANs: A: 27 hosts, B: 90 hosts, C: 17 hosts, D: 5 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: 27B: 90C: 17D: 5
x =

Answer key

  1. 1. p = 25
  2. 2. H = 254
  3. 3. p = 22
  4. 4. N = 128
  5. 5. x = 207
  6. 6. x = 160

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