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
fourth octet of /25112806403201608040201oneszeros

Write the subnet mask of a /25 network in dotted-decimal notation. What is the value x of its fourth octet?

/25
x =
2.Easy
/2211111111111111111111110000000000network bitshost bits

An access list must match the network 172.16.0.0/22. Access lists use a wildcard mask, the inverse of the subnet mask. What is the third octet x of the wildcard mask?

/22
x =
3.Medium
/20 → /2611111111111111111111111111000000network bitshost bits

The network 10.186.192.0/20 is divided into equal subnets with prefix /26. How many subnets N are there?

10.186.192.0/20/26
N =
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

The network 192.168.222.0/24 is split with VLSM for these LANs: A: 23 hosts, B: 25 hosts, C: 13 hosts, D: 3 hosts, E: 6 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 A?

A: 23B: 25C: 13D: 3E: 6
x =
6.Hard
last octet = 70012816403201608141201networkhost

A host has the address 10.20.20.70/29. What is the fourth octet x of its network address?

10.20.20.70/29
x =

Answer key

  1. 1. x = 128
  2. 2. x = 3
  3. 3. N = 64
  4. 4. H = 14
  5. 5. x = 32
  6. 6. x = 64

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