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
/2011111111111111111111000000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /20?

/20
H =
2.Easy
/1911111111111111111110000000000000network bitshost bits

An access list must match the network 172.16.0.0/19. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/19
x =
3.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.250.0/24 is divided into /27 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the broadcast address of subnet 5?

192.168.250.0/24/27subnet 5 (subnet 1 starts at .0)
x =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 4 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/244 subnets
H =
5.Hard
last octet = 26012806403211618041201networkhost

A host has the address 10.20.216.26/28. What is the fourth octet x of its network address?

10.20.216.26/28
x =
6.Hard
last octet = 130112806403201608041201networkhost

A host has the address 10.20.32.130/29. What is the fourth octet x of its network address?

10.20.32.130/29
x =

Answer key

  1. 1. H = 4094
  2. 2. x = 31
  3. 3. x = 159
  4. 4. H = 62
  5. 5. x = 16
  6. 6. x = 128

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