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
/2511111111111111111111111110000000network bitshost bits

An access list must match the network 192.168.1.0/25. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/25
x =
2.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 =
3.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 630 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

630 hosts
p =
4.Medium
/?11111111111111111111110000000000network bitshost bits

A department needs 963 host addresses in a single subnet. What is the longest prefix length p (smallest subnet) that is big enough?

963 hosts
p =
5.Hard
last octet = 57012806413211618040211networkhost

A host has the address 10.20.61.57/27. What is the fourth octet x of the last usable host address in its subnet?

10.20.61.57/27
x =
6.Hard
third octet = 152112806403211618040201networkhost

A host has the address 172.20.152.122/19. What is the third octet x of its network address?

172.20.152.122/19
x =

Answer key

  1. 1. x = 127
  2. 2. x = 31
  3. 3. p = 22
  4. 4. p = 22
  5. 5. x = 62
  6. 6. x = 128

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