Ann: Third Supplementary Target's Statement, page-33

Registery company does generally have contact numbers and emails for registry participants who have added them when issues or just in contact details when they logged in. . There are 2 parts to registers and there has been great debate as to what has to legally kept and accessible and what is used for corporate actions and company intelligence and via asic to compare holders etc. CRM and corporate intelligence and then add in cross ref to land titles, phone book listings, and credit rating lists and you have a lot of data that confirms identity, address, status etc etc. Some registrar charge companies for this extra service and others contra it as data sharing and it is generally in the privacy doc everyone clicks past . Registries who have many companies on books and common HIN obviously have a lot more data as holder may have given extra details when participating in issue for another company, dividends , phone inquiry etc etc

You can independently get these lists and combine to create a data pool or use their extra charge services in many cases. Some data requires company authorising release depending on how and why it was acquired . A lot of data matching is confirmational and ranked to prove something over a certain % hurdle that they are ata that mobile number, that email address , are related to XX person, Have same business or residential address and so on. .