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 /25?

/25

H =

2.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 =

3.Medium

A subnet uses the mask 255.255.254.0. How many usable host addresses H does it have?

255.255.254.0

H =

4.Medium

The network 192.168.10.0/24 must be divided into at least 10 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2410 subnets

H =

5.Hard

The network 192.168.58.0/24 is split with VLSM for these LANs: A: 17 hosts, B: 42 hosts, C: 33 hosts, D: 10 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: 17B: 42C: 33D: 10

x =

6.Hard

The network 192.168.26.0/24 is split with VLSM for these LANs: A: 52 hosts, B: 13 hosts, C: 30 hosts, D: 39 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 C?

A: 52B: 13C: 30D: 39

x =

Answer key

1. H = 126
2. x = 127
3. H = 510
4. H = 14
5. x = 128
6. x = 128

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