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
255.255.224.011111111111111111110000000000000network bitshost bits

A subnet has the mask 255.255.224.0. What is its prefix length p?

255.255.224.0
p =
2.Easy
/2311111111111111111111111000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /23?

/23
H =
3.Medium
/22 → /2511111111111111111111111110000000network bitshost bits

The network 10.151.192.0/22 is divided into equal subnets with prefix /25. How many subnets N are there?

10.151.192.0/22/25
N =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.87.0/24 is divided into /29 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the broadcast address of subnet 4?

192.168.87.0/24/29subnet 4 (subnet 1 starts at .0)
x =
5.Hard

The network 192.168.125.0/24 is split with VLSM for these LANs: A: 22 hosts, B: 4 hosts, C: 79 hosts, D: 20 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: 22B: 4C: 79D: 20
x =
6.Hard
last octet = 63012806413211618141211networkhost

A host has the address 10.20.198.63/29. What is the fourth octet x of the last usable host address in its subnet?

10.20.198.63/29
x =

Answer key

  1. 1. p = 19
  2. 2. H = 510
  3. 3. N = 8
  4. 4. x = 31
  5. 5. x = 128
  6. 6. x = 62

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