IP Address / CIDR Iterator

Problem Overview

Implement a multi-part IPv4 iterator system in Python using the standard iterator protocol (__init__, __iter__, __next__). The problem is revealed one part at a time; each part must be fully coded with passing tests before the next is unlocked. Part 1 – Forward Iterator: Given a starting IPv4 string (e.g.,…

• 4 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