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
/2611111111111111111111111111000000network bitshost bits

An access list must match the network 192.168.1.0/26. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/26
x =
2.Easy
/2811111111111111111111111111110000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /28?

/28
H =
3.Medium
/?11111111111111111111111000000000network bitshost bits

A department needs 295 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

295 hosts
p =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 3 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/243 subnets
H =
5.Hard

The network 192.168.103.0/24 is split with VLSM for these LANs: A: 79 hosts, B: 5 hosts, C: 25 hosts, D: 24 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: 79B: 5C: 25D: 24
x =
6.Hard
third octet = 155112806403211618041211networkhost

A host has the address 172.20.155.147/22. What is the third octet x of its network address?

172.20.155.147/22
x =

Answer key

  1. 1. x = 63
  2. 2. H = 14
  3. 3. p = 23
  4. 4. H = 62
  5. 5. x = 160
  6. 6. x = 152

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