sources = {
'arin' : ('ftp://ftp.arin.net/pub/stats/arin/', 'arin.%Y%m%d'),
'ripencc': ('ftp://ftp.ripe.net/ripe/stats/', 'ripencc.%Y%m%d'),
'apnic' : ('ftp://ftp.apnic.net/pub/stats/apnic/', 'apnic-%Y-%m-%d')
}