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
/2411111111111111111111111100000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /24?

/24
H =
2.Easy
/2611111111111111111111111111000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /26?

/26
H =
3.Medium
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 5 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/245 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 = 37012806413201608140211networkhost

A host has the address 10.20.71.37/26. What is the fourth octet x of the last usable host address in its subnet?

10.20.71.37/26
x =
6.Hard
third octet 224 … 230112816413201608040201commonvaries

A router has routes to these networks: 10.172.224.0/24, 10.172.225.0/24, 10.172.226.0/24, 10.172.227.0/24, 10.172.228.0/24, 10.172.229.0/24, 10.172.230.0/24. What is the longest prefix length p of a single summary route that covers all of them?

10.172.224.0/24 … 10.172.230.0/24
p =

Answer key

  1. 1. H = 254
  2. 2. H = 62
  3. 3. H = 30
  4. 4. H = 30
  5. 5. x = 62
  6. 6. p = 21

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