Before starting an assessment, a penetration tester needs to scan a Class B IPv4 network for open ports in a short amount of time. Which of the following is the best tool for this task?

The correct answer is B. masscan. A Class B IPv4 network contains 65,536 IP addresses (x.y.0.0/16). Scanning such a large network quickly requires a high-speed, asynchronous scanner. masscan is the best tool for this task because: It can scan the entire Internet (0.0.0.0/0) in minutes. It uses asynchronous…

Submitted by deeparc· Mar 6, 2026Network Security

Question

Options

ABurp Suite
Bmasscan
CNmap
Dhping

How the community answered

(37 responses)

A
3% (1)
B
89% (33)
C
3% (1)
D
5% (2)

Explanation

A Class B IPv4 network contains 65,536 IP addresses (x.y.0.0/16). Scanning such a large network quickly requires a high-speed, asynchronous scanner. masscan is the best tool for this task because: It can scan the entire Internet (0.0.0.0/0) in minutes. It uses asynchronous scanning, unlike Nmap, which is slower for large networks. Can send millions of packets per second, making it the fastest port scanner available. Syntax for scanning a Class B network (masscan -p1-65535 192.168.0.0/16 -- rate=100000) optimized for speed, but does not provide detailed service information like

Topics

#Penetration testing tools#Port scanning#Network reconnaissance#masscan

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