Australia · Validation
Australian postcode validator.
Check the four-digit postcode shape locally, then use Australia Post for the live suburb and address record.
Check a postcode
Result
Enter a postcode and press Validate.
What this check means
Australian postcodes use four digits. The range and locality assignment are maintained in Australia Post’s postcode data; this local check only confirms that the input has the expected four-digit shape and is not 0000.
Official source and freshness
Checked 2026-09-29 against Australia Post’s Postcode Finder and its postcode data service. Australia Post is the authority for live postcode and locality results.
Privacy
The format check runs entirely on this device. The postcode is not sent to TNAADO, saved, or logged. Use Australia Post’s finder when you need a live lookup.