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 /27?

/27

H =

2.Easy

An access list must match the network 172.16.0.0/17. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/17

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 192.168.46.0/24 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 network address of subnet 4?

192.168.46.0/24/28subnet 4 (subnet 1 starts at .0)

x =

5.Hard

A host has the address 172.20.201.44/20. What is the third octet x of its subnet's broadcast address?

172.20.201.44/20

x =

6.Hard

The network 192.168.12.0/24 is split with VLSM for these LANs: A: 8 hosts, B: 38 hosts, C: 25 hosts, D: 110 hosts. Subnets are allocated from .0 upwards, the LAN with the most hosts first, each with the smallest subnet that fits. What is the fourth octet x of the network address of LAN A?

A: 8B: 38C: 25D: 110

x =

Answer key

1. H = 30
2. x = 127
3. H = 6
4. x = 48
5. x = 207
6. x = 224

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