IP Address Account Registration / Fraud Detection

CodingOpenAILast reported July 2026Medium Frequency
Reported
4× across candidate reports
First seen
September 2025
Last reported
July 2026
Reported outcome
mixed

Problem Overview

You are told that the same IP address has been used to register hundreds of accounts on a platform. Investigate and describe: (1) How would you investigate this scenario to determine if it is fraudulent activity? (2) What signals or data points would you…

  • 5 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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