Subnetting Quiz: Can You Calculate It in Your Head?

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| By Thames
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Quizzes Created: 7097 | Total Attempts: 80,150
| Questions: 20 | Updated: Jul 1, 2026
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1. How many bits are in the host portion of a /25 subnet?

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About This Quiz
Subnetting Quiz: Can You Calculate IT In Your Head? - Quiz

Master the fundamentals of Subnetting (Network+) with this college-level quiz designed to test your ability to calculate subnets, determine host ranges, and work with CIDR notation. Whether you're preparing for the CompTIA Network+ exam or strengthening your networking skills, this quiz challenges you to solve practical subnetting problems that network... see moreadministrators face daily. Build confidence in mental math and subnet calculations. see less

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2. True or False: A /8 subnet mask (255.0.0.0) creates more subnets than a /16 subnet mask.

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3. True or False: The address 192.168.1.255 can be a valid host address in a /24 network.

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4. True or False: In a /26 subnet, there are exactly 62 usable host addresses.

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5. A /31 subnet is used for ____ connections in modern networking.

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6. In subnetting, the ____ address is used for routing and cannot be assigned to hosts.

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7. The private IP range 10.0.0.0/8 can be divided into ____ Class B networks.

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8. A network with 2000 hosts requires a minimum prefix length of ____.

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9. What is the last usable host in the 10.20.30.0/25 subnet?

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10. Which subnet mask allows 510 usable host addresses?

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11. What is the subnet mask for a /24 network in dotted decimal notation?

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12. What is the first usable host address in 192.168.5.96/27?

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13. A /32 address represents what in networking?

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14. Which address falls within the 172.16.0.0/12 network range?

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15. How many subnets can you create from a /16 network using /24 subnets?

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16. What is the broadcast address for the subnet 10.0.0.0/22?

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17. Convert 255.255.248.0 to CIDR notation.

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18. A /30 subnet is commonly used for what network purpose?

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19. Which address is the network address for 192.168.10.130/25?

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20. How many usable host addresses are available in a /28 subnet?

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How many bits are in the host portion of a /25 subnet?
True or False: A /8 subnet mask (255.0.0.0) creates more subnets than...
True or False: The address 192.168.1.255 can be a valid host address...
True or False: In a /26 subnet, there are exactly 62 usable host...
A /31 subnet is used for ____ connections in modern networking.
In subnetting, the ____ address is used for routing and cannot be...
The private IP range 10.0.0.0/8 can be divided into ____ Class B...
A network with 2000 hosts requires a minimum prefix length of ____.
What is the last usable host in the 10.20.30.0/25 subnet?
Which subnet mask allows 510 usable host addresses?
What is the subnet mask for a /24 network in dotted decimal notation?
What is the first usable host address in 192.168.5.96/27?
A /32 address represents what in networking?
Which address falls within the 172.16.0.0/12 network range?
How many subnets can you create from a /16 network using /24 subnets?
What is the broadcast address for the subnet 10.0.0.0/22?
Convert 255.255.248.0 to CIDR notation.
A /30 subnet is commonly used for what network purpose?
Which address is the network address for 192.168.10.130/25?
How many usable host addresses are available in a /28 subnet?
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