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Design a forward-only iterator that yields sequential IPv4 addresses starting from a given string.
Implement `hasNext()` and `next()` methods ensuring O(1) time and space complexity per operation.
Manage internal state by converting dotted-decimal notation into a numeric representation for efficient iteration.
What This Tests
Iterator design pattern implementation
Conversion between string formats and numeric values
State management and boundary checking
Bitwise operations or base-256 arithmetic
Common Patterns
Iterator Pattern
Bit Manipulation
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