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 /23?

/23

H =

2.Easy

A subnet has the mask 255.255.255.240. What is its prefix length p?

255.255.255.240

p =

3.Medium

The network 192.168.208.0/24 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 4?

192.168.208.0/24/26subnet 4 (subnet 1 starts at .0)

x =

4.Medium

The network 192.168.212.0/24 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?

192.168.212.0/24/29subnet 9 (subnet 1 starts at .0)

x =

5.Hard

A router has routes to these networks: 10.162.13.0/24, 10.162.14.0/24, 10.162.15.0/24, 10.162.16.0/24, 10.162.17.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.162.13.0/24 … 10.162.17.0/24

p =

6.Hard

A host has the address 10.20.160.50/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.160.50/30

x =

Answer key

1. H = 510
2. p = 28
3. x = 192
4. x = 64
5. p = 19
6. x = 51

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