In your Shopify admin, go to Apps and open Address Ninja. Click ZIP / Postal Code Block. Search and add the countries where you want to block specific ZIP / postal codes. Enter the codes you want to block in the text field for each country - you can use exact codes like "12345", wildcards like "900" to block all codes starting with 900, or multiple patterns separated by commas. Click Activate. You can customize the error message that customers see when they enter a blocked ZIP / postal code.
Use cases: Block high-risk fraud zones, restrict delivery to certain areas, manage temporary service disruptions, or ensure compliance with regional regulations.