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Certified Ethical Hacker (CEH) Practice Question

During the footprinting phase against ACME Corp, a whois lookup shows the company controls autonomous system number AS64500. You need an authoritative list of every publicly routable IPv4 prefix ACME is currently announcing so you can accurately scope subsequent scans. Which action will give you the most complete and up-to-date result while minimizing false positives?

  • Use a search engine to find lists labeled "ACME IP ranges" and adopt whatever blocks appear in the top results.

  • Collect the source IP addresses from the Received headers of recent outbound emails sent by ACME employees.

  • Run an Nmap ping sweep across the entire 0.0.0.0/0 space and record whichever IPs answer.

  • Query public BGP route-view databases (e.g., Route Views or RIPE RIS) for all prefixes originated by AS64500.

Certified Ethical Hacker (CEH)
Reconnaissance Techniques
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