As it grows, the Internet is becoming more fragile in many ways. The complexity in managing or repairing damage to the system can only be navigated with sustained understanding of the evolving commercial Internet infrastructure. The research and tools proposed under this effort lead to such insights. In particular, richer access to data will facilitate development of tools for navigation, analysis, and correlated visualization of massive network data sets and path specific performance and routing data that are critical to advancing both research and operational efforts. We also expect to be able to offer suggestions to ISPs and routing vendors with respect to what instrumentation within the router would facilitate diagnosing and fixing problems in [closer to] real-time. Finally, this research has obvious relevance to public policy and regulatory questions regarding concentration of administration of Internet infrastructure.