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 /29?

/29

H =

2.Easy

An access list must match the network 192.168.1.0/30. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/30

x =

3.Medium

The network 192.168.10.0/24 must be divided into at least 4 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/244 subnets

H =

4.Medium

The network 192.168.105.0/24 is divided into /28 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?

192.168.105.0/24/28subnet 12 (subnet 1 starts at .0)

x =

5.Hard

A router has routes to these networks: 10.252.67.0/24, 10.252.68.0/24, 10.252.69.0/24, 10.252.70.0/24, 10.252.71.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.252.67.0/24 … 10.252.71.0/24

p =

6.Hard

A host has the address 10.20.232.58/27. What is the fourth octet x of its network address?

10.20.232.58/27

x =

Answer key

1. H = 6
2. x = 3
3. H = 62
4. x = 176
5. p = 21
6. x = 32

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