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

An access list must match the network 172.16.0.0/20. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/20

x =

2.Easy

A subnet has the mask 255.255.255.128. What is its prefix length p?

255.255.255.128

p =

3.Medium

The network 192.168.96.0/24 is divided into /26 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 2?

192.168.96.0/24/26subnet 2 (subnet 1 starts at .0)

x =

4.Medium

The network 192.168.101.0/24 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 broadcast address of subnet 2?

192.168.101.0/24/29subnet 2 (subnet 1 starts at .0)

x =

5.Hard

The network 192.168.97.0/24 is split with VLSM for these LANs: A: 85 hosts, B: 33 hosts, C: 20 hosts, D: 8 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: 85B: 33C: 20D: 8

x =

6.Hard

A host has the address 10.20.27.81/27. What is the fourth octet x of its network address?

10.20.27.81/27

x =

Answer key

1. x = 15
2. p = 25
3. x = 64
4. x = 15
5. x = 128
6. x = 64

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