max-mapper

ftp servers referenced from data.gov metadata (count is many urls on each server are in the data.gov metadata):

901441 "rockyftp.cr.usgs.gov"
    259 "ghrc.nsstc.nasa.gov"
    185 "acdisc.gsfc.nasa.gov"
    158 "ftp2.census.gov"
    119 "podaac-ftp.jpl.nasa.gov"
     73 "gpm.nsstc.nasa.gov"
     71 "airbornescience.nsstc.nasa.gov"