From What Range Can RFID Tags Be Interrogated?

We are asked this question often, but the answer is complicated. Active tags typically have a read range of up to 1,000 meters (3,281 feet). Last year, we wrote about a California RFID technology startup called Iotera that was launching a new active radio frequency identification tag that could transmit location- and sensor-based data at a distance of up to four miles. The tag—part of Iotera's Wireless Sensing and Tracking Platform—includes a GPS unit, a temperature sensor and an accelerometer so that it can transmit its longitude and latitude to a reader, along with its temperature or movement status (see Iotera Develops Active RFID Tag With 4-Mile Read Range).