Quick Answer
The answer is Masscan, the most suitable tool for a fast network scanner designed to cover a large subnet like a /16. Its unmatched speed comes from asynchronous transmission, allowing it to send packets at rates exceeding 10 million per second, which is critical when scanning 65,536 hosts efficiently. On the Certified Ethical Hacker CEH exam, this question tests your understanding of tool specialization versus general-purpose utilities; a common trap is choosing Nmap, which is powerful but slower for raw host discovery across massive ranges because it processes responses synchronously by default. To remember, think of Masscan as the “massive scan” tool—its name literally combines “mass” and “scan,” and its speed is often compared to firing a machine gun versus a sniper rifle.
This CEH practice question tests your understanding of footprinting, reconnaissance and scanning. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security analyst is asked to perform a fast scan of a large network (e.g., /16 subnet) to identify live hosts. Which tool is MOST suitable for this task due to its high speed?
hping3
Why wrong: hping3 is a packet crafting tool, not designed for wide-scale fast scanning.
Nmap
Why wrong: Nmap is powerful but slower than Masscan for very large scans.
Masscan
Masscan is optimized for speed and can scan the entire internet in minutes.
Wireshark
Why wrong: Wireshark is a packet analyzer, not a scanning tool.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Masscan
Masscan is the most suitable tool for this task because it is designed specifically for high-speed scanning of large address spaces, such as a /16 subnet (65,536 hosts). It uses asynchronous transmission and can send packets at rates exceeding 10 million packets per second, making it significantly faster than Nmap for raw host discovery across massive ranges.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
hping3
Why it's wrong here
hping3 is a packet crafting tool, not designed for wide-scale fast scanning.
Nmap
Why it's wrong here
Nmap is powerful but slower than Masscan for very large scans.
Masscan
Why this is correct
Masscan is optimized for speed and can scan the entire internet in minutes.
Related concept
Read the scenario before looking for a memorised answer.
Wireshark
Why it's wrong here
Wireshark is a packet analyzer, not a scanning tool.
Common exam traps
The trap here is that candidates often assume Nmap is always the fastest scanning tool due to its popularity, but Masscan is specifically engineered for speed on massive networks, and the CEH exam tests this distinction.
Detailed technical explanation
Masscan uses a custom TCP/IP stack and raw sockets to send probes asynchronously, allowing it to maintain high packet rates without waiting for responses. It can be tuned with the --rate parameter to control packets per second, and it supports multiple output formats (e.g., JSON, XML, grepable) for integration with other tools. In real-world pentesting, Masscan is often used first to quickly identify live hosts on a /16 or larger subnet, then Nmap is used for detailed service enumeration on the discovered hosts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Footprinting, Reconnaissance and Scanning — study guide chapter
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FAQ
Footprinting, Reconnaissance and Scanning — This question tests Footprinting, Reconnaissance and Scanning — Read the scenario before looking for a memorised answer..
The correct answer is: Masscan — Masscan is the most suitable tool for this task because it is designed specifically for high-speed scanning of large address spaces, such as a /16 subnet (65,536 hosts). It uses asynchronous transmission and can send packets at rates exceeding 10 million packets per second, making it significantly faster than Nmap for raw host discovery across massive ranges.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CEH practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CEH exam.
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