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

A subnet has the mask 255.255.248.0. What is its prefix length p?

255.255.248.0

p =

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 255.255.255.240. How many usable host addresses H does it have?

255.255.255.240

H =

4.Medium

A department needs 1291 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1291 hosts

p =

5.Hard

The network 192.168.209.0/24 is split with VLSM for these LANs: A: 105 hosts, B: 34 hosts, C: 12 hosts, D: 21 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 B?

A: 105B: 34C: 12D: 21

x =

6.Hard

The network 192.168.131.0/24 is split with VLSM for these LANs: A: 39 hosts, B: 48 hosts, C: 28 hosts, D: 13 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: 39B: 48C: 28D: 13

x =

Answer key

1. p = 21
2. x = 127
3. H = 14
4. p = 21
5. x = 128
6. x = 128

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