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 255.255.248.0. What is its prefix length p?

255.255.248.0

p =

2.Easy

How many usable host addresses H are there in an IPv4 subnet with prefix /27?

/27

H =

3.Medium

A subnet uses the mask 255.255.255.192. How many usable host addresses H does it have?

255.255.255.192

H =

4.Medium

The network 192.168.213.0/24 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 6?

192.168.213.0/24/29subnet 6 (subnet 1 starts at .0)

x =

5.Hard

The network 192.168.228.0/24 is split with VLSM for these LANs: A: 19 hosts, B: 126 hosts, C: 8 hosts, D: 54 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: 19B: 126C: 8D: 54

x =

6.Hard

The network 192.168.126.0/24 is split with VLSM for these LANs: A: 4 hosts, B: 15 hosts, C: 72 hosts, D: 29 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: 4B: 15C: 72D: 29

x =

Answer key

1. p = 21
2. H = 30
3. H = 62
4. x = 40
5. x = 128
6. x = 128

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