Home Internet of Things Aerospace Apparel Energy Defense Health Care Logistics Manufacturing Retail

Ask The Experts Forum

BlogsAsk The Experts ForumHow Can Companies Ensure That Serial Numbers Are Unique?

How Can Companies Ensure That Serial Numbers Are Unique?

Posted By RFID Journal, 06.13.2011
Usually, there's a 32-bit transponder identification (TID) number and a 64-bit unique identification (UID) number for RFID tag specifications. Which one is unalterable and unique?

—Name withheld

Not all RFID tags are the same. Some have a transponder ID, and some do not. It depends on the manufacturer's choice. The TID is usually written to a chip at the point of manufacture, and is unalterable.

Some ultrahigh-frequency (UHF) tags can store only a 64-bit, 96-bit or 128-bit serial number. These can be read-only or read-write. Others also have blocks of user memory that can be written to and locked, or rewritten over and over.

Note that a TID is not necessarily unique. As far as I am aware, there is no global registry to determine which serial numbers have or have not been assigned, so a chip manufacturer in Japan could wind up using the same TID as a Korean chipmaker. (If any of our readers can confirm or correct me on this, please feel free to do so.)

Electronic Product Codes (EPCs) are unique serial numbers written to transponders, because members of EPCglobal are provided with a unique manager number (or corporate ID), and can thus create unique EPCs.

I hope that answers your question.

—Mark Roberti, Founder and Editor,
RFID Journal

Login and post your comment!

Not a member?

Signup for an account now to access all of the features of RFIDJournal.com!

Next Post
Will RFID Prices Come Down in the Near F...
Previous Post
How Can I Advertise on RFIDJournal.com?
Case Studies Features Best Practices How-Tos
Live Events Virtual Events Webinars
Simply enter a question for our experts.
RFID Journal LIVE! RFID in Health Care LIVE! LatAm LIVE! Brasil LIVE! Europe RFID Connect Virtual Events RFID Journal Awards Webinars Presentations