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Which technique is least likely to find hidden subdomains?

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Which technique is least likely to find hidden subdomains?

Brute-force a wordlist of probable subdomains (e.g., www, dev, api)

Query Certificate Transparency logs for issued certificates

Query historical DNS/archived DNS datasets (passive DNS)

Scanning only for open TCP port 22 on random IP addresses without referencing DNS records

This question is part of this quiz :

Cyber Quiz Day 30
Tags:
Ethical Hacking
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