Hmm. the information which comes out is 100% from the whitepages in New Zealand.

How do I know that? As the name/formatting of my entry on that website is the same as whitepages and they got it wrong on whitepages (and this website) :-) 

Then they store the informtaion in a database and you can search for the phone number :-)

all very against the T&C of whitepages.