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
255.255.248.011111111111111111111100000000000network bitshost bits

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

255.255.248.0
p =
2.Easy
/2211111111111111111111110000000000network bitshost bits

An access list must match the network 172.16.0.0/22. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/22
x =
3.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.104.0/24 is divided into /29 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the network address of subnet 8?

192.168.104.0/24/29subnet 8 (subnet 1 starts at .0)
x =
4.Medium
/?11111111111111111111111000000000network bitshost bits

A department needs 265 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

265 hosts
p =
5.Hard
last octet = 85012816403211608140211networkhost

A host has the address 10.20.79.85/28. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.79.85/28
x =
6.Hard
last octet = 121012816413211618040211networkhost

A host has the address 10.20.19.121/29. What is the fourth octet x of its network address?

10.20.19.121/29
x =

Answer key

  1. 1. p = 21
  2. 2. x = 3
  3. 3. x = 56
  4. 4. p = 23
  5. 5. x = 95
  6. 6. x = 120

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