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
/2311111111111111111111111000000000network bitshost bits

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

/23
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1539 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1539 hosts
p =
4.Medium
/?11111111111111111111111000000000network bitshost bits

A department needs 415 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

415 hosts
p =
5.Hard

The network 192.168.95.0/24 is split with VLSM for these LANs: A: 49 hosts, B: 124 hosts, C: 13 hosts, D: 22 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: 49B: 124C: 13D: 22
x =
6.Hard
last octet = 248112816413211618040201networkhost

A host has the address 10.20.150.248/26. What is the fourth octet x of the last usable host address in its subnet?

10.20.150.248/26
x =

Answer key

  1. 1. H = 126
  2. 2. H = 510
  3. 3. p = 21
  4. 4. p = 23
  5. 5. x = 224
  6. 6. x = 254

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