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

Write the subnet mask of a /18 network in dotted-decimal notation. What is the value x of its third octet?

/18

x =

2.Easy

A subnet has the mask 255.255.255.252. What is its prefix length p?

255.255.255.252

p =

3.Medium

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

255.255.255.240

H =

4.Medium

The network 192.168.105.0/24 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 12?

192.168.105.0/24/29subnet 12 (subnet 1 starts at .0)

x =

5.Hard

The network 192.168.16.0/24 is split with VLSM for these LANs: A: 42 hosts, B: 10 hosts, C: 4 hosts, D: 96 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: 42B: 10C: 4D: 96

x =

6.Hard

The network 192.168.76.0/24 is split with VLSM for these LANs: A: 71 hosts, B: 3 hosts, C: 24 hosts, D: 20 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: 71B: 3C: 24D: 20

x =

Answer key

1. x = 192
2. p = 30
3. H = 14
4. x = 88
5. x = 192
6. x = 192

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