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
/2311111111111111111111111000000000network bitshost bits

How many usable host addresses H are there in an IPv4 subnet with prefix /23?

/23
H =
2.Easy
255.255.128.011111111111111111000000000000000network bitshost bits

A subnet has the mask 255.255.128.0. What is its prefix length p?

255.255.128.0
p =
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 → /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 =
5.Hard
last octet = 103012816413201608141211networkhost

A host has the address 10.20.79.103/26. What is the last number (fourth octet) x of its subnet's broadcast address?

10.20.79.103/26
x =
6.Hard

The network 192.168.29.0/24 is split with VLSM for these LANs: A: 12 hosts, B: 54 hosts, C: 124 hosts, D: 20 hosts. Subnets are allocated from .0 upwards, the LAN with the most hosts first, each with the smallest subnet that fits. What is the fourth octet x of the network address of LAN D?

A: 12B: 54C: 124D: 20
x =

Answer key

  1. 1. H = 510
  2. 2. p = 17
  3. 3. H = 14
  4. 4. H = 6
  5. 5. x = 127
  6. 6. x = 192

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