reference number; order number; tracking number
A number used to identify a specific inquiry, order, or shipment when contacting customer service or checking status.
Please provide the reference number when making an inquiry.
この問い合わせ番号で配送状況を確認できます。
You can check the delivery status with this tracking number.
Specifically a tracking number for parcels; 問い合わせ番号 is broader and can refer to any inquiry or order reference number.
Reception or application number; often used when submitting a form or request, while 問い合わせ番号 is for inquiries.
Standard kanji spelling.
Variant with 合せ instead of 合わせ; both are used.
Compound of 問い合わせ (inquiry) + 番号 (number).