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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

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
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 4 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/244 subnets
H =
4.Medium
255.255.255.24011111111111111111111111111110000network bitshost bits

A subnet uses the mask 255.255.255.240. How many usable host addresses H does it have?

255.255.255.240
H =
5.Hard

The network 192.168.211.0/24 is split with VLSM for these LANs: A: 53 hosts, B: 76 hosts, C: 3 hosts, D: 10 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: 53B: 76C: 3D: 10
x =
6.Hard
third octet 84 … 89012816403211608140201commonvaries

A router has routes to these networks: 10.181.84.0/24, 10.181.85.0/24, 10.181.86.0/24, 10.181.87.0/24, 10.181.88.0/24, 10.181.89.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.181.84.0/24 … 10.181.89.0/24
p =

Answer key

  1. 1. H = 126
  2. 2. H = 510
  3. 3. H = 62
  4. 4. H = 14
  5. 5. x = 192
  6. 6. p = 20

Full step-by-step solutions: practise this topic on examproblems.com.