While performing passive footprinting on a prospective client, you must identify the web server type, CMS, JavaScript libraries, advertising networks, and CDN services used by the company's public site, but you are not allowed to send any direct traffic to the target host. Which freely accessible web service can supply this detailed technology stack information simply by entering the site's URL into a browser?
BuiltWith is an online reconnaissance service that indexes millions of websites and reports the complete technology profile it detects, including web-server version, CMS, JavaScript frameworks, analytics, advertising networks, and CDN usage. Because all queries are made against BuiltWith's own databases, the tester gathers extensive information without generating any traffic toward the target, satisfying the passive-reconnaissance constraint.
The other options do not focus on full technology enumeration:
VirusTotal is primarily for malware and URL scanning and will forward the target URL for analysis, violating the no-contact rule.
archive.today (or similar web-archiving sites) stores page snapshots but does not analyze underlying technologies.
MXToolbox specializes in DNS, SMTP, and blacklist lookups, not comprehensive technology fingerprinting. Therefore, BuiltWith is the most appropriate choice.
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What is passive footprinting, and how does it differ from active footprinting?
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Reconnaissance Techniques
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