Internet Quality

M-Lab Network Annotations: Geolocation, ASNs, and What They Mean

How M-Lab annotates measurements with geographic and network metadata, the accuracy and limitations of each annotation type, and how to use them correctly in analysis.

Reading Percentiles in Monthly Stats

How to interpret percentile columns in M-Lab Monthly Stats data, including the counterintuitive polarity of latency and loss, and what p50 vs p95 tells you.

FAQ: Test Rate Limits

M-Lab enforces 40 tests per day per IP address. Learn what this means and how to work within the limit.