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
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
/24 → /2711111111111111111111111111100000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 6 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/246 subnets
H =
4.Medium
/24 → /2911111111111111111111111111111000network bitshost bits

The network 10.118.143.0/24 is divided into equal subnets with prefix /29. How many subnets N are there?

10.118.143.0/24/29
N =
5.Hard

The network 192.168.241.0/24 is split with VLSM for these LANs: A: 119 hosts, B: 9 hosts, C: 19 hosts, D: 56 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 C?

A: 119B: 9C: 19D: 56
x =
6.Hard
third octet = 108012816413201618140201networkhost

A host has the address 172.20.108.106/19. What is the third octet x of its subnet's broadcast address?

172.20.108.106/19
x =

Answer key

  1. 1. H = 126
  2. 2. p = 25
  3. 3. H = 30
  4. 4. N = 32
  5. 5. x = 192
  6. 6. x = 127

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