About us
A phone book for the calls you didn't expect
NumberCheck.com.au is an independent Australian service that helps people work out who is behind an unknown call or text. Australians lose hundreds of millions of dollars a year to phone-based scams, and the first line of defence is simple: knowing whether a number has already bothered someone else.
What we do
Every Australian number we see gets its own page: the number in national and +61 format, what kind of line it is (mobile, landline, 1300, 1800, 13xx, premium), the region it is allocated to, a community risk score, and the reports people have written about it. Nothing is scraped from third-party lists and nothing is bought from data brokers.
Where the data comes from
Reports come from members of the public who received a call or text. Each submission includes a caller category, an overall rating and an optional comment. Reports are opinions and experiences — not verified facts — and we label them that way everywhere they appear.
How moderation works
Every report is queued for human review before publication. Moderators reject anything containing personal information, defamation, advertising, hate speech or obvious manipulation. Duplicate submissions are blocked automatically: one report per number per visitor per day, checked against an irreversible, anonymous fingerprint. Basic link and shouting heuristics flag likely spam for a closer look. Read the community guidelines for the full rules.
How the risk score is built
The score on each number page is derived from approved reports only: the volume of reports, the ratio of negative to neutral and safe ratings, and how recent the activity is. A number with two old reports never looks the same as one with forty from this month.
For businesses
Legitimate callers are sometimes reported by mistake — a debt-collection call, a survey, a delivery driver using a personal mobile. If you own a number you can request business verification so your side of the story sits at the top of the page, or ask us to remove reports that are inaccurate.
How we pay for it
NumberCheck is free to use. Running costs are covered by advertising placed alongside content. We do not sell reports, personal data or reporter identities, and advertisers get no access to submissions.
Get in touch
Removal requests, corrections, media enquiries and moderation appeals all go through our contact page. Abuse and dangerous content can be flagged via report abuse.