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

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

/29

H =

2.Easy

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 =

3.Medium

A department needs 396 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

396 hosts

p =

4.Medium

The network 192.168.104.0/24 is divided into /28 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 3?

192.168.104.0/24/28subnet 3 (subnet 1 starts at .0)

x =

5.Hard

The network 192.168.130.0/24 is split with VLSM for these LANs: A: 11 hosts, B: 47 hosts, C: 16 hosts, D: 86 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: 11B: 47C: 16D: 86

x =

6.Hard

A host has the address 10.20.166.171/28. What is the fourth octet x of the last usable host address in its subnet?

10.20.166.171/28

x =

Answer key

1. H = 6
2. x = 63
3. p = 23
4. x = 32
5. x = 192
6. x = 174

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