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

Write the subnet mask of a /26 network in dotted-decimal notation. What is the value x of its fourth octet?

/26

x =

3.Medium

The network 192.168.10.0/24 must be divided into at least 3 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/243 subnets

H =

4.Medium

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

255.255.255.192

H =

5.Hard

A router has routes to these networks: 10.209.141.0/24, 10.209.142.0/24, 10.209.143.0/24, 10.209.144.0/24, 10.209.145.0/24, 10.209.146.0/24, 10.209.147.0/24, 10.209.148.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.209.141.0/24 … 10.209.148.0/24

p =

6.Hard

A router has routes to these networks: 10.136.234.0/24, 10.136.235.0/24, 10.136.236.0/24, 10.136.237.0/24, 10.136.238.0/24, 10.136.239.0/24, 10.136.240.0/24, 10.136.241.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.136.234.0/24 … 10.136.241.0/24

p =

Answer key

1. H = 510
2. x = 192
3. H = 62
4. H = 62
5. p = 19
6. p = 19

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