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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1.Easy
/1911111111111111111110000000000000network bitshost bits

An access list must match the network 172.16.0.0/19. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/19
x =
2.Easy
/2211111111111111111111110000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /22?

/22
H =
3.Medium
255.255.255.24011111111111111111111111111110000network bitshost bits

A subnet uses the mask 255.255.255.240. How many usable host addresses H does it have?

255.255.255.240
H =
4.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 =
5.Hard
third octet = 225112816413201608040211networkhost

A host has the address 172.20.225.76/23. What is the third octet x of its subnet's broadcast address?

172.20.225.76/23
x =
6.Hard
third octet = 60012806413211618140201networkhost

A host has the address 172.20.60.124/20. What is the third octet x of its network address?

172.20.60.124/20
x =

Answer key

  1. 1. x = 31
  2. 2. H = 1022
  3. 3. H = 14
  4. 4. H = 14
  5. 5. x = 225
  6. 6. x = 48

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