We are using PingER and PlanetLab landmarks for geolocation in TULIP. PlanetLab landmarks are manually updated with the help of perl script "insert_planetlab.pl" which is under tulip directory /afs/slac.stanford.edu/package/pinger/tulip. This scripts loops over monthly active hosts in PlanetLab and inserts new one based on thier availability.PingER nodes are updated with the help of automated script "