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

How many usable host addresses H are there in an IPv4 subnet with prefix /28?

/28
H =
2.Easy
/2511111111111111111111111110000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /25?

/25
H =
3.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 16 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2416 subnets
H =
4.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 6 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/246 subnets
H =
5.Hard
last octet = 154112806403211618041201networkhost

A host has the address 10.20.225.154/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.225.154/30
x =
6.Hard
last octet = 147112806403211608041211networkhost

A host has the address 10.20.130.147/30. What is the fourth octet x of the last usable host address in its subnet?

10.20.130.147/30
x =

Answer key

  1. 1. H = 14
  2. 2. H = 126
  3. 3. H = 14
  4. 4. H = 30
  5. 5. x = 155
  6. 6. x = 146

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