Sources & Data Notes:FCC 477 data represents the advertized speeds as reported by the ISPs for a given census tract, if the ISP could service 1 household in that census tract. To provide a unified value for the census tract, we have taken all of the advertized speeds available, and shown the median value based on the speeds reported from the ISPs.
M-Lab NDT data are Network Diagnostic Tool (NDT) measurements gathered from internet users running NDT against M-Lab servers. The data are aggregated into the reporting time periods for the FCC 477 data.