This looked promising: "TULIP's purpose is to geolocate a specified target host (identified by IP name or address) using ping RTT delay measurements to the tar

This looked promising: "TULIP's purpose is to geolocate a specified target host (identified by IP name or address) using ping RTT delay measurements to the target from reference landmark hosts whose positions are well known (see map or table)." https://tulip.slac.stanford.edu/ https://tulip.slac.stanford.edu/ But the endpoint it posts to seems dead.