What Is Amazon ASIN Number? How to Find, Use & Check ASIN
Amazon ASIN number is a unique identifier used to track products on Amazon. In this guide, you will learn what an ASIN is, where to find it, and how to use it effectively.
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What Is Amazon ASIN Number?
Definition
ASIN stands for Amazon Standard Identification Number. It is a unique 10-character alphanumeric code that Amazon assigns to every product listed on its platform. It always starts with the letter "B" — for example, B08N5WRWNW.
Amazon uses ASINs to organize hundreds of millions of products in its catalog. When multiple sellers list the same product, they all share one ASIN. This keeps reviews, ratings, and product details consolidated in a single place.
Exception: For books, the ASIN matches the ISBN (International Standard Book Number) rather than a B-prefixed code.
How to Find Amazon ASIN Number
There are three ways to find the ASIN for any Amazon product.
Check the Product URL
Open the product page on Amazon. Look at the URL in your browser address bar. The ASIN appears right after "/dp/". For example: amazon.in/dp/B08N5WRWNW — the ASIN is B08N5WRWNW.
Fastest method — works on any device without logging in.
Product Details Section
Scroll to the bottom of any Amazon product page. Look for the "Product Information" or "Technical Details" section. The ASIN is listed there directly alongside other product specs.
Useful when the URL is a shortened or redirected link.
Amazon Seller Central
Log in to Seller Central and go to Inventory → Manage Inventory. The ASIN is shown next to each product listing alongside your SKU. You can also search by product name or barcode to find the ASIN.
Required for sellers managing their own catalog.
What Is ASIN Used For?
ASINs are not just tracking codes. They are the foundation of almost every seller activity on Amazon.
Product Identification
Every product on Amazon is uniquely identified by its ASIN. It prevents duplicate listings and keeps product data — title, images, specs — consistent across all sellers.
Listing Management
When you add inventory on Seller Central, you match it to an existing ASIN or create a new one. The ASIN links your offer to the correct product detail page.
Advertising (PPC)
All Amazon PPC campaigns — Sponsored Products, Sponsored Brands, Sponsored Display — target at the ASIN level. You bid on keywords or competitor ASINs to drive traffic.
Search Tracking
You can track your ASIN's organic rank for specific keywords, monitor Buy Box status, and measure conversion rates. Tools like Brand Analytics use ASIN as the primary identifier.
FBA Inventory
When you send products to Amazon's fulfillment centers, shipments are organized and tracked by ASIN. Amazon uses it to reconcile received units and manage warehouse placement.
Customer Reviews
All reviews for a product consolidate under one ASIN. When multiple sellers list against the same ASIN, they all share the same review pool and rating.
Example of Amazon ASIN
An ASIN is always 10 characters long. It starts with the letter "B" followed by 9 alphanumeric characters.
Example ASIN
B08N5WRWNW
ASIN vs SKU vs UPC
Sellers often confuse these identifiers. Each serves a different purpose. Here is a clear comparison:
| Identifier | Assigned By | Length | Scope | Purpose |
|---|---|---|---|---|
| ASIN | Amazon | 10 characters | Amazon only | Amazon-specific product identifier |
| SKU | Seller | Custom (any) | Your account only | Internal seller stock identifier |
| UPC | Retail (North America) | 12 digits | Global (N. America) | Product barcode for retail |
| EAN | Global retail | 13 digits | Global | International product barcode |
| ISBN | Books | 13 digits | Books globally | Identifier for books only |
Key takeaway: ASIN is for Amazon's catalog. SKU is for your own inventory management. UPC/EAN are required to create a new ASIN unless you have a GTIN exemption.
How to Create a New ASIN on Amazon
If your product does not already exist on Amazon, you need to create a new listing. Amazon automatically generates the ASIN when it is approved.
Log in to Seller Central
Go to sellercentral.amazon.in (India) or sellercentral.amazon.com and sign in to your account.
Go to Inventory → Add a Product
Click the Inventory menu at the top, then select "Add a Product" from the dropdown.
Search for your product
Type your product name, brand, or barcode. If the product already exists on Amazon, it will appear — match to that ASIN instead.
Select "I'm adding a product not sold on Amazon"
If your product is genuinely new and not in Amazon's catalog, choose this option to create a fresh ASIN.
Select the correct product category
Choose the most relevant category carefully. This affects your referral fee percentage and product discoverability.
Enter all product details
Fill in product title, brand, description, bullet points, images, price, and inventory quantity.
Add UPC or EAN barcode
Enter the product barcode. Amazon uses this to verify uniqueness. If you don't have one, apply for a GTIN exemption first.
Submit for review
Submit the listing. Once approved, Amazon automatically generates a unique ASIN for your product — you cannot choose it yourself.
Important: You cannot choose or modify your ASIN. Amazon assigns it automatically. Never copy an ASIN from another product — this creates a duplicate listing and violates Amazon's policies.
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Amazon FBA Fees & Profit Guide
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Amazon Listing Optimization Guide
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