From the Webpage Description: : "The Indicators of Broadband Need map was created by the United States Department of Commerce, National Telecommunications and Information Administration (NTIA). The map uses several different data sources to show information on broadband availability within the United States. Layers in this map were created using data sourced from the American Community Survey collected by the U.S. Census, Measurement Lab (M-Lab), Ookla, Microsoft and the Federal Communications Commission (FCC). In addition, there is a layer in the map that displays the locations of higher education institutions eligible as Minority Serving Institutions (MSIs) under NTIA's Connecting Minority Communities grant program. There is also a layer that shows areas designated as American Indian, Alaska Native and Native Hawaiian Areas [hyperlink] by the U.S. Census in 2020. A description of each data set is given below as well as information on how to download the county, census tract and census block level data used in the map."
NTIA ArcGIS Online: https://broadbandusa.maps.arcgis.com/