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
/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
/2311111111111111111111111000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /23?

/23
H =
3.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1481 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1481 hosts
p =
4.Medium
/?11111111111111111111100000000000network bitshost bits

A department needs 1568 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1568 hosts
p =
5.Hard
last octet = 91012816403211618041211networkhost

A host has the address 10.20.67.91/28. What is the fourth octet x of the last usable host address in its subnet?

10.20.67.91/28
x =
6.Hard
last octet = 39012806413201608141211networkhost

A host has the address 10.20.21.39/26. What is the fourth octet x of the last usable host address in its subnet?

10.20.21.39/26
x =

Answer key

  1. 1. x = 15
  2. 2. H = 510
  3. 3. p = 21
  4. 4. p = 21
  5. 5. x = 94
  6. 6. x = 62

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