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
/2811111111111111111111111111110000network bitshost bits

An access list must match the network 192.168.1.0/28. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/28
x =
2.Easy
255.255.192.011111111111111111100000000000000network bitshost bits

A subnet has the mask 255.255.192.0. What is its prefix length p?

255.255.192.0
p =
3.Medium
/24 → /2511111111111111111111111110000000network bitshost bits

The network 192.168.159.0/24 is divided into /25 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 2?

192.168.159.0/24/25subnet 2 (subnet 1 starts at .0)
x =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 10.208.75.0/24 is divided into equal subnets with prefix /29. How many subnets N are there?

10.208.75.0/24/29
N =
5.Hard
last octet = 14012806403201618141201networkhost

A host has the address 10.20.194.14/29. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.194.14/29
x =
6.Hard
last octet = 41012806413201618040211networkhost

A host has the address 10.20.1.41/26. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.1.41/26
x =

Answer key

  1. 1. x = 15
  2. 2. p = 18
  3. 3. x = 255
  4. 4. N = 32
  5. 5. x = 15
  6. 6. x = 63

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