Whose fax number is this?

Reverse fax number lookup: what works

There is no single public directory of fax numbers in Canada, so a reverse fax number search is really a set of searches:

1. Search the full number in quotes in a web search engine, with and without dashes. Businesses list fax numbers on their websites, letterhead PDFs and contact pages.
2. Search professional directories. Provincial regulatory colleges for physicians, pharmacists and lawyers often publish office fax numbers.
3. Check your own records: past emails, invoices, referral forms and contact lists often contain the number.
4. Try a fax number reverse lookup on a general phone lookup site. Results for fax lines are often thin, and some sites charge for reports, so treat paid results with caution.
5. Call the number as a voice call. A fax line will answer with tones, which at least confirms it is a working fax number; some offices share one number for voice and fax.

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How to verify fax number details before sending

If you are about to send medical, legal or financial documents, verifying the number matters more than identifying a stranger's number. To verify fax number details, get the number from an official source, such as the organisation's website or a phone call to their main line, rather than from an email signature or an unexpected message. Read it back digit by digit. For sensitive faxes, send a cover page first or call to confirm receipt.

Be cautious with unsolicited faxes asking you to fax back personal information or call a premium number. Under Canada's unsolicited telecommunications rules, businesses must identify themselves on faxes they send, and a fax that hides its origin is a warning sign.