Guide to Checking UL Certification Numbers

The UL certification proves that a product has been rigorously tested and meets the international safety and quality standards of Underwriters Laboratories (UL) — a globally recognized certification organization. UL-certified products are trusted for their safety, reliability, and quality, especially in the U.S. and international markets.

1. Types of UL Labels

UL Listed

• Applies to fully functional, standalone products.

• Thoroughly tested for fire resistance, electrical safety, and mechanical durability.

• Often listed in global safety catalogs, highlighting the brand’s quality and reliability.

UL Recognized

• Intended for components or parts of a complete product.

• Tested under less stringent conditions than UL Listed but still meets industry requirements.

• Common for electrical components, power supplies, or insulating materials.

• Even as partial components, UL Recognized items must meet high-quality standards to be integrated safely into larger systems.

2. How to Identify a Genuine UL Label

A legitimate UL label should include:

1. The “UL” letters in a circle with a ® symbol under the “U.”

2. The word “LISTED” in uppercase, under or beside the circle.

3. A 4-character identification code (or 6 in special cases).

4. A clear product description matching the labeled item.

3. Notes on UL Standards

• UL standards mainly apply to products exported to the U.S.

• cUL or ULC logos: For Canadian markets.

• cULus label: Indicates certification for both U.S. and Canadian standards.

• Labels may also include the file number (starting with “E”), manufacturer’s name or logo, and technical specifications such as model numbers or catalog codes.

4. Steps to Verify a UL Certification Number

Step 1: Locate the UL label on the product

• Find the UL label on a visible or detachable part of the product.

• Some manufacturers provide certification details on their websites for customer convenience.

• Example: CAT VAN LOI with certification number E544671.

Step 2: Access UL Product iQ

• UL Product iQ is an official, online platform for quick searches of certified products.

• Access is now free and no longer requires a company email address.

Step 3: Enter search information

• Option 1: Input the certification number from the UL label.

• Option 2: Search by company or brand name.

Step 4: Review certification details

• The results will display:

  • Document: Certification file

  • Company Name: Manufacturer name

  • Product Description: Description of the certified product

• Click the Document link to view details like product category, file number, model list, and company information.

Summary

Verifying a UL certification number ensures that products meet international safety and quality standards, while reinforcing brand reputation. With UL Product iQ, the verification process is now faster, clearer, and more accessible.