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
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
2.Easy
/2911111111111111111111111111111000network bitshost bits

An access list must match the network 192.168.1.0/29. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/29
x =
3.Medium
/22 → /2411111111111111111111111100000000network bitshost bits

The network 10.126.52.0/22 is divided into equal subnets with prefix /24. How many subnets N are there?

10.126.52.0/22/24
N =
4.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 12 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2412 subnets
H =
5.Hard
third octet = 249112816413211618040211networkhost

A host has the address 172.20.249.219/18. What is the third octet x of its network address?

172.20.249.219/18
x =
6.Hard
last octet = 227112816413201608041211networkhost

A host has the address 10.20.132.227/30. What is the fourth octet x of the last usable host address in its subnet?

10.20.132.227/30
x =

Answer key

  1. 1. H = 62
  2. 2. x = 7
  3. 3. N = 4
  4. 4. H = 14
  5. 5. x = 192
  6. 6. x = 226

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