# REL02-BP03: Ensure IP subnet allocation accounts for expansion

## Description

Plan IP addresses để accommodate growth và availability requirements.

## Implementation Guidance

- Plan IP ranges for 3-5 year growth
- Reserve space for new availability zones
- Use CIDR blocks efficiently
- Document IP allocation strategy
- Avoid overlapping ranges between environments

## Risk Level

Low - Poor planning causes migration pain later.

## Related Best Practices

- [REL02-BP05](REL02-BP05-Non-Overlapping-IP-Ranges.md)
- [REL01-BP03](../REL01-Foundations-Service-Quotas/REL01-BP03-Accommodate-Fixed-Quotas.md)
