Area code & prefix lookup

This tool identifies the exchange — the area code plus three-digit prefix — of a Canadian number: its exchange area, province or territory, time zone, and the carrier the prefix block was originally assigned to. It never identifies the person calling, and because Canada has full number portability, the current carrier of a specific number may differ from the original assignee.

Data: Canadian Numbering Administrator (CNAC), as of 2026-07-04. Lookups run entirely in your browser against data bundled with this site.

How Caller Atlas's lookup works

The tool extracts digits from whatever you type — with or without a country code (+1, 1), dashes, dots, parentheses, or spaces. The first three digits are matched against the Canadian numbering plan areas on record with the Canadian Numbering Administrator (CNAC); if you supply six or more digits, the next three are matched against the central-office (CO) codes assigned inside that area code. Each CO code is a block of 10,000 numbers with a recorded exchange area, province, status, and assignee carrier.

What we don't do is look up the subscriber. Caller Atlas is an exchange-level reference, not a reverse phone directory. The result tells you the geographic exchange and the carrier originally assigned the block — which in most practical cases is exactly what you need to evaluate an unfamiliar incoming call. It cannot tell you who called, and a ported number may now be served by a different carrier.