Convert domain to IP address, then lookup IP address will show you ISP ( internet service provider )
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&select_folder=56&select_layer=0
Convert domain to IP address
https://www.coderstool.com/domain-into-ip
lookup IP address will show you ISP
https://whatismyipaddress.com/