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EC-Council

312-50V12 · Question #23

Clark, a professional hacker, was hired by an organization to gather sensitive information about its competitors surreptitiously. Clark gathers the server IP address of the target organization using…

The correct answer is C. ARIN. Clark used ARIN, a Regional Internet Registry, to look up network range and topology information associated with a target IP address during the reconnaissance phase of an attack.

Submitted by obi.ng· Mar 4, 2026Reconnaissance Techniques

Question

Clark, a professional hacker, was hired by an organization to gather sensitive information about its competitors surreptitiously. Clark gathers the server IP address of the target organization using Whois footprinting. Further, he entered the server IP address as an input to an online tool to retrieve information such as the network range of the target organization and to identify the network topology and operating system used in the network. What is the online tool employed by Clark in the above scenario?

Options

  • ADuckDuckGo
  • BAOL
  • CARIN
  • DBaidu

How the community answered

(32 responses)
  • B
    3% (1)
  • C
    94% (30)
  • D
    3% (1)

Why each option

Clark used ARIN, a Regional Internet Registry, to look up network range and topology information associated with a target IP address during the reconnaissance phase of an attack.

ADuckDuckGo

DuckDuckGo is a privacy-focused search engine used for general web searches and does not provide IP-to-network-range lookup or network topology data.

BAOL

AOL is a web portal and search engine that does not offer IP address registry lookups or network infrastructure information.

CARINCorrect

ARIN (American Registry for Internet Numbers) is a Regional Internet Registry (RIR) that maintains a public WHOIS database allowing lookups by IP address to retrieve information such as network range (CIDR blocks), organization details, and network topology data. By entering a server IP address into ARIN's online tool, an attacker can map out the target's network infrastructure, making it a key resource during IP-based footprinting and reconnaissance activities.

DBaidu

Baidu is a Chinese-language search engine used for general web searching and does not provide RIR-style IP address or network range lookup functionality.

Concept tested: WHOIS footprinting using Regional Internet Registry (ARIN)

Source: https://www.arin.net/resources/registry/whois/

Topics

#Whois footprinting#IP information lookup#ARIN

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