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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1.Easy
/1811111111111111111100000000000000network bitshost bits

An access list must match the network 172.16.0.0/18. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/18
x =
2.Easy
/2711111111111111111111111111100000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /27?

/27
H =
3.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.236.0/24 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 broadcast address of subnet 5?

192.168.236.0/24/28subnet 5 (subnet 1 starts at .0)
x =
4.Medium
255.255.255.22411111111111111111111111111100000network bitshost bits

A subnet uses the mask 255.255.255.224. How many usable host addresses H does it have?

255.255.255.224
H =
5.Hard
last octet = 160112806413201608040201networkhost

A host has the address 10.20.177.160/27. What is the fourth octet x of the last usable host address in its subnet?

10.20.177.160/27
x =
6.Hard

The network 192.168.13.0/24 is split with VLSM for these LANs: A: 21 hosts, B: 8 hosts, C: 60 hosts, D: 5 hosts, E: 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 E?

A: 21B: 8C: 60D: 5E: 13
x =

Answer key

  1. 1. x = 63
  2. 2. H = 30
  3. 3. x = 79
  4. 4. H = 30
  5. 5. x = 190
  6. 6. x = 96

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