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
/2711111111111111111111111111100000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /27?

/27
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 → /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 =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.209.0/24 is divided into /29 subnets, numbered 1, 2, 3, … from the lowest address (subnet 1 starts at .0). What is the fourth octet x of the network address of subnet 5?

192.168.209.0/24/29subnet 5 (subnet 1 starts at .0)
x =
5.Hard
last octet = 25012806403211618040211networkhost

A host has the address 10.20.45.25/28. What is the fourth octet x of its network address?

10.20.45.25/28
x =
6.Hard
third octet 105 … 106012816413201618040211commonvaries

A router has routes to these networks: 10.200.105.0/24, 10.200.106.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.200.105.0/24 … 10.200.106.0/24
p =

Answer key

  1. 1. H = 30
  2. 2. H = 126
  3. 3. H = 30
  4. 4. x = 32
  5. 5. x = 16
  6. 6. p = 22

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