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
/2311111111111111111111111000000000network bitshost bits

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

/23
H =
3.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 3 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/243 subnets
H =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 30 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2430 subnets
H =
5.Hard
third octet 242 … 246112816413211608041201commonvaries

A router has routes to these networks: 10.255.242.0/24, 10.255.243.0/24, 10.255.244.0/24, 10.255.245.0/24, 10.255.246.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.255.242.0/24 … 10.255.246.0/24
p =
6.Hard
last octet = 164112806413201608140201networkhost

A host has the address 10.20.53.164/25. What is the fourth octet x of its network address?

10.20.53.164/25
x =

Answer key

  1. 1. H = 62
  2. 2. H = 510
  3. 3. H = 62
  4. 4. H = 6
  5. 5. p = 21
  6. 6. x = 128

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