Australian Property Owner Mobile Leads

I need a clean, accurate list of mobile numbers that belong to property owners throughout Australia. The data must be gathered solely through online research on public property listing sites—think realestate.com.au, Domain, and similar platforms—rather than from purchased databases or telemarketing efforts.

You may use any legitimate research techniques that stay within the public domain of these listing sites. Whenever you capture a number, also note the owner’s name (where shown), property address, and the exact URL you sourced it from so I can validate the information quickly.

Please outline:
• your estimated lead volume and timeframe
• the tools or scraping utilities you prefer (if any)
• how you will verify that each number truly belongs to the listed owner

The final spreadsheet should arrive ready for immediate upload to my CRM, with columns for Name, Mobile Number, Property Address, Source URL, and Date Collected.