There are some 4.5m of them sold to date, you can see usage information and sales data (and lots of other stuff!) here: http://ntldstats.com/ http://ntldstats.c

There are some 4.5m of them sold to date, you can see usage information and sales data (and lots of other stuff!) here: http://ntldstats.com/ http://ntldstats.com/ Usage data (or a rough proxy for it) here: https://ntldstats.com/parking/tld https://ntldstats.com/parking/tld The names not used are parked.