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 255.255.255.128. What is its prefix length p?

255.255.255.128

p =

2.Easy

An access list must match the network 192.168.1.0/26. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/26

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 192.168.10.0/24 must be divided into at least 6 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/246 subnets

H =

5.Hard

The network 192.168.177.0/24 is split with VLSM for these LANs: A: 11 hosts, B: 19 hosts, C: 3 hosts, D: 14 hosts, E: 47 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 D?

A: 11B: 19C: 3D: 14E: 47

x =

6.Hard

The network 192.168.142.0/24 is split with VLSM for these LANs: A: 18 hosts, B: 9 hosts, C: 104 hosts, D: 62 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: 18B: 9C: 104D: 62

x =

Answer key

1. p = 25
2. x = 63
3. H = 6
4. H = 30
5. x = 96
6. x = 224

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