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
/2411111111111111111111111100000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /24?

/24
H =
2.Easy
/2711111111111111111111111111100000network bitshost bits

An access list must match the network 192.168.1.0/27. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/27
x =
3.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 812 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

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

A department needs 1319 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

1319 hosts
p =
5.Hard
last octet = 145112806403211608040211networkhost

A host has the address 10.20.178.145/27. What is the fourth octet x of its network address?

10.20.178.145/27
x =
6.Hard
last octet = 43012806413201618041211networkhost

A host has the address 10.20.74.43/29. What is the fourth octet x of its network address?

10.20.74.43/29
x =

Answer key

  1. 1. H = 254
  2. 2. x = 31
  3. 3. p = 22
  4. 4. p = 21
  5. 5. x = 128
  6. 6. x = 40

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