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 172.16.0.0/21. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/21

x =

2.Easy

An access list must match the network 192.168.1.0/27. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/27

x =

3.Medium

The network 192.168.10.0/24 must be divided into at least 20 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2420 subnets

H =

4.Medium

The network 192.168.191.0/24 is divided into /26 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 2?

192.168.191.0/24/26subnet 2 (subnet 1 starts at .0)

x =

5.Hard

A host has the address 10.20.125.104/25. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.125.104/25

x =

6.Hard

A host has the address 10.20.38.33/26. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.38.33/26

x =

Answer key

1. x = 7
2. x = 31
3. H = 6
4. x = 64
5. x = 127
6. x = 63

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