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 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 =

2.Easy

A subnet has the mask 255.255.255.252. What is its prefix length p?

255.255.255.252

p =

3.Medium

The network 192.168.165.0/24 is divided into /27 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 8?

192.168.165.0/24/27subnet 8 (subnet 1 starts at .0)

x =

4.Medium

The network 192.168.10.0/24 must be divided into at least 6 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/246 subnets

H =

5.Hard

A router has routes to these networks: 10.107.167.0/24, 10.107.168.0/24, 10.107.169.0/24, 10.107.170.0/24, 10.107.171.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.107.167.0/24 … 10.107.171.0/24

p =

6.Hard

A router has routes to these networks: 10.141.110.0/24, 10.141.111.0/24, 10.141.112.0/24, 10.141.113.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.141.110.0/24 … 10.141.113.0/24

p =

Answer key

1. x = 63
2. p = 30
3. x = 224
4. H = 30
5. p = 20
6. p = 19

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