What Is Standard Carrier Alpha Code (SCAC)?

Global shipping relies on complex logistics, and even a small identification error, like listing the wrong carrier, can lead to customs delays and fines. That’s where the Standard Carrier Alpha Code (SCAC) comes in.

It simplifies documentation, tracking, and communication, helping shipments move smoothly without avoidable errors. In this article, we’ll explain what an SCAC is, how it’s used, and how to find one.

Define SCAC Code

A SCAC is a unique four-letter code assigned to transportation carriers to ensure accurate identification across the supply chain. You can find it on bills of lading, freight invoices, or customs filings. They are mainly used in ocean freight, land transport, and in some express freight systems.

These codes are issued by the National Motor Freight Traffic Association (NMFTA) and used globally in freight operations. However, they aren’t just assigned automatically.

A carrier has to apply for code, and once their application gets approved, the code can be used throughout multiple logistics, documents, and tools, such as the bill of lading, freight invoices, tracking software, and more. 

Why SCAC Codes Matter?

The primary purpose of the shipping code is to help in creating consistency and accuracy across multiple shipping operations.

Given that there are thousands of carriers operating under similar names, a standardized identifier ensures that the right carrier can get recognized at every step of the logistics process. For example, it plays a critical role in shipment tracking and allows systems to update locations and even statuses without any confusion. 

Moreover, any carrier moving cargo into, out of, or within the U.S. should have an active Standard Carrier Alpha Code. The most critical function of the SCAC for an importer is its role in filing the Importer Security Filing (ISF) and the Customs Entry. CBP (Customs and Border Protection) and other agencies use SCAC to verify carrier legitimacy and flag high-risk or suspicious movements.

You or your customs broker needs to file the ISF at least 24 hours before the goods are loaded onto the ship. When you do this, you’ll also need to include the SCAC code of the carrier, the company that issues the bill of lading, whether it’s the shipping line (VOCC) or NVOCC (like a freight forwarder).

A valid SCAC helps CBP quickly identify the carrier, which reduces questions and delays. If you used the Master carrier’s code instead of the House carrier’s code, CBP couldn’t match your ISF to the carrier’s manifest. So they will hold your cargo on arrival, and you need to pay for the penalties.

ship your cargo

How to Find the Standard Carrier Alpha Code?

Before shipping, verify a carrier’s SCAC code by confirming its legal name and transport type, then checking the code in an official database or logistics system.

You can verify if a company is legitimate and in good standing by checking its code against the National Motor Freight Traffic Association (NMFTA) database. This organization maintains all the SCAC codes, and carriers can apply directly through the NMFTA, while shippers and brokers can use other authorized tools that integrate this data. 

What Importers Should Watch out for?

Unlike some other permanent IDs, SCAC codes must be renewed annually. If you work with smaller trucking companies or niche freight forwarders, ask them for proof of valid SCAC before moving import freight.

You might get confused about which Standard Carrier Alpha Code to use when there are multiple parties involved. For ISF filings, you almost always need the House SCAC if an NVOCC is involved. Master SCAC is the code of the actual vessel operator (like Maersk). The House SCAC is the code of the Freight Forwarder or NVOCC that issued the House Bill of Lading.

After verifying a carrier’s SCAC online, confirm that it on the bill of lading, service contract, or arrival notice matches the carrier’s own documentation. Also, check if SCACs in service contracts, routing guides, or EDI setups are consistent.

Examples of SCAC Codes

Here are some noted carriers in the freight shipping industry and their SCAC codes for your reference.

The SCAC Code List of Major Ocean Carriers

SCAC Codes of Express Companies

For couriers, this is more complicated. The SCAC code for FedEx Express can be FDXE, and the SCAC code for DHL Express can be DHLG, or not.

For example, DHL has multiple entities (DHL Express, DHL eCommerce Solutions, DHL Global Forwarding, etc.), and each legal carrier entity can have its own SCAC. In a specific program or mode, like small parcel, freight, or forwarding, the SCAC code varies accordingly. Confirm the code on the courier’s own documentation, like the freight bill.

SCAC vs. Other Carrier Codes

It’s common to confuse SCAC codes with other identifiers such as MC numbers, DOT numbers, and ISO codes. Understanding the differences is important.

An MC number, issued by the Federal Motor Carrier Safety Administration (FMCSA), identifies motor carriers that operate for hire. A DOT number, also issued by the FMCSA, is mainly used for safety compliance and regulatory monitoring.

ISO codes, on the other hand, are international standards used to identify countries, currencies, or organizations, not individual freight carriers.

What sets the SCAC apart is its direct role in shipping and logistics documentation. Unlike regulatory identifiers, Standard Carrier Alpha Codes are specifically designed for operational use in freight systems, such as bookings, tracking, and customs filings.

Final Thoughts 

While it may seem like a small detail, using the correct Standard Carrier Alpha Code can make a big difference in international shipping. From ISF filings to freight tracking, SCAC codes help reduce errors and streamline communication across the supply chain. Taking the time to verify them early can save costs and prevent unnecessary disruptions later on.

Frequently Asked Questions (FAQs)

A SCAC code is a four-letter identifier that’s assigned to transportation carriers. This code helps accurately identify carriers on freight documents and tracking systems. 

Most importers do not need to register for their own SCAC code. However, if you are an importer with your own private fleet of trucks and you plan to cross the US border to pick up your own goods, you become the carrier. In this case, you must apply for your own SCAC code with the NMFTA.

To find a carrier’s SCAC code, you can perform a carrier alpha code lookup through the National Motor Freight Traffic Association (NMFTA) or other authorized logistics platforms that integrate such data.