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

A subnet has the mask 255.255.192.0. What is its prefix length p?

255.255.192.0

p =

2.Easy

An access list must match the network 192.168.1.0/27. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/27

x =

3.Medium

The network 192.168.122.0/24 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 network address of subnet 9?

192.168.122.0/24/29subnet 9 (subnet 1 starts at .0)

x =

4.Medium

The network 10.235.220.0/22 is divided into equal subnets with prefix /25. How many subnets N are there?

10.235.220.0/22/25

N =

5.Hard

A host has the address 10.20.188.73/27. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.188.73/27

x =

6.Hard

The network 192.168.120.0/24 is split with VLSM for these LANs: A: 39 hosts, B: 10 hosts, C: 56 hosts, D: 16 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 B?

A: 39B: 10C: 56D: 16

x =

Answer key

1. p = 18
2. x = 31
3. x = 64
4. N = 8
5. x = 95
6. x = 160

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