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

Write the subnet mask of a /22 network in dotted-decimal notation. What is the value x of its third octet?

/22

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 30 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2430 subnets

H =

4.Medium

The network 192.168.26.0/24 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 broadcast address of subnet 2?

192.168.26.0/24/28subnet 2 (subnet 1 starts at .0)

x =

5.Hard

A host has the address 10.20.56.197/30. What is the fourth octet x of its network address?

10.20.56.197/30

x =

6.Hard

A router has routes to these networks: 10.56.125.0/24, 10.56.126.0/24, 10.56.127.0/24, 10.56.128.0/24, 10.56.129.0/24, 10.56.130.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.56.125.0/24 … 10.56.130.0/24

p =

Answer key

1. x = 252
2. x = 63
3. H = 6
4. x = 31
5. x = 196
6. p = 16

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