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
255.255.192.011111111111111111100000000000000network bitshost bits

A subnet has the mask 255.255.192.0. What is its prefix length p?

255.255.192.0
p =
2.Easy
/2811111111111111111111111111110000network bitshost bits

An access list must match the network 192.168.1.0/28. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/28
x =
3.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 =
4.Medium
/16 → /2111111111111111111111100000000000network bitshost bits

The network 172.26.0.0/16 is divided into equal subnets with prefix /21. How many subnets N are there?

172.26.0.0/16/21
N =
5.Hard
last octet = 195112816403201608041211networkhost

A host has the address 10.20.132.195/26. What is the fourth octet x of the last usable host address in its subnet?

10.20.132.195/26
x =
6.Hard
last octet = 65012816403201608040211networkhost

A host has the address 10.20.112.65/25. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.112.65/25
x =

Answer key

  1. 1. p = 18
  2. 2. x = 15
  3. 3. H = 6
  4. 4. N = 32
  5. 5. x = 254
  6. 6. x = 127

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