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
third octet of /19112816413201608040201oneszeros

Write the subnet mask of a /19 network in dotted-decimal notation. What is the value x of its third octet?

/19
x =
2.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 =
3.Medium
255.255.255.19211111111111111111111111111000000network bitshost bits

A subnet uses the mask 255.255.255.192. How many usable host addresses H does it have?

255.255.255.192
H =
4.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 12 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2412 subnets
H =
5.Hard
last octet = 228112816413201608140201networkhost

A host has the address 10.20.188.228/26. What is the fourth octet x of its network address?

10.20.188.228/26
x =
6.Hard
last octet = 8012806403201618040201networkhost

A host has the address 10.20.55.8/25. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.55.8/25
x =

Answer key

  1. 1. x = 224
  2. 2. p = 25
  3. 3. H = 62
  4. 4. H = 14
  5. 5. x = 192
  6. 6. x = 127

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