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

An access list must match the network 192.168.1.0/25. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/25

x =

2.Easy

An access list must match the network 172.16.0.0/18. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/18

x =

3.Medium

The network 192.168.10.0/24 must be divided into at least 5 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/245 subnets

H =

4.Medium

The network 10.165.30.0/24 is divided into equal subnets with prefix /27. How many subnets N are there?

10.165.30.0/24/27

N =

5.Hard

A router has routes to these networks: 10.185.82.0/24, 10.185.83.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.185.82.0/24 … 10.185.83.0/24

p =

6.Hard

A router has routes to these networks: 10.156.159.0/24, 10.156.160.0/24, 10.156.161.0/24, 10.156.162.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.156.159.0/24 … 10.156.162.0/24

p =

Answer key

1. x = 127
2. x = 63
3. H = 30
4. N = 8
5. p = 23
6. p = 18

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