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
/2911111111111111111111111111111000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /29?

/29
H =
3.Medium
/16 → /2411111111111111111111111100000000network bitshost bits

The network 172.28.0.0/16 is divided into equal subnets with prefix /24. How many subnets N are there?

172.28.0.0/16/24
N =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.245.0/24 is divided into /27 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the network address of subnet 5?

192.168.245.0/24/27subnet 5 (subnet 1 starts at .0)
x =
5.Hard

The network 192.168.89.0/24 is split with VLSM for these LANs: A: 18 hosts, B: 83 hosts, C: 9 hosts, D: 48 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 D?

A: 18B: 83C: 9D: 48
x =
6.Hard
last octet = 231112816413201608141211networkhost

A host has the address 10.20.243.231/28. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.243.231/28
x =

Answer key

  1. 1. H = 126
  2. 2. H = 6
  3. 3. N = 256
  4. 4. x = 128
  5. 5. x = 128
  6. 6. x = 239

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