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
255.255.255.12811111111111111111111111110000000network bitshost bits

A subnet has the mask 255.255.255.128. What is its prefix length p?

255.255.255.128
p =
2.Easy
/2811111111111111111111111111110000network bitshost bits

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

/28
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 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.233.0/24 is divided into /26 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 2?

192.168.233.0/24/26subnet 2 (subnet 1 starts at .0)
x =
5.Hard
third octet = 166112806413201608141201networkhost

A host has the address 172.20.166.0/18. What is the third octet x of its subnet's broadcast address?

172.20.166.0/18
x =
6.Hard
last octet = 220112816403211618140201networkhost

A host has the address 10.20.46.220/27. What is the fourth octet x of the last usable host address in its subnet?

10.20.46.220/27
x =

Answer key

  1. 1. p = 25
  2. 2. H = 14
  3. 3. H = 62
  4. 4. x = 64
  5. 5. x = 191
  6. 6. x = 222

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