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
/2311111111111111111111111000000000network bitshost bits

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

/23
H =
2.Easy
/2211111111111111111111110000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /22?

/22
H =
3.Medium
/22 → /2911111111111111111111111111111000network bitshost bits

The network 10.50.212.0/22 is divided into equal subnets with prefix /29. How many subnets N are there?

10.50.212.0/22/29
N =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 20 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2420 subnets
H =
5.Hard
last octet = 164112806413201608140201networkhost

A host has the address 10.20.112.164/26. What is the fourth octet x of its network address?

10.20.112.164/26
x =
6.Hard
last octet = 7012806403201608141211networkhost

A host has the address 10.20.171.7/26. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.171.7/26
x =

Answer key

  1. 1. H = 510
  2. 2. H = 1022
  3. 3. N = 128
  4. 4. H = 6
  5. 5. x = 128
  6. 6. x = 63

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