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
/2511111111111111111111111110000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /25?

/25
H =
2.Easy
/2611111111111111111111111111000000network bitshost bits

An access list must match the network 192.168.1.0/26. Access lists use a wildcard mask, the inverse of the subnet mask. What is the fourth octet x of the wildcard mask?

/26
x =
3.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.5.0/24 is divided into /28 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 4?

192.168.5.0/24/28subnet 4 (subnet 1 starts at .0)
x =
4.Medium
/24 → /2611111111111111111111111111000000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 4 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/244 subnets
H =
5.Hard
last octet = 129112806403201608040211networkhost

A host has the address 10.20.100.129/30. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.100.129/30
x =
6.Hard
last octet = 59012806413211618041211networkhost

A host has the address 10.20.143.59/27. What is the fourth octet x of the last usable host address in its subnet?

10.20.143.59/27
x =

Answer key

  1. 1. H = 126
  2. 2. x = 63
  3. 3. x = 48
  4. 4. H = 62
  5. 5. x = 131
  6. 6. x = 62

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