About Sigfox - Basics

Sigfox is dedicated to giving a voice to the physical world, thanks to our dedicated network.

The service focuses on:

  • Simplicity : No configuration, no connection, no signaling
  • Autonomy : Very low energy consumption, allowing years of autonomy on battery without maintenance
  • Small messages : No large assets or multimedia, only small messages

Sending a message

There is no signaling, nor negotiation between a device and a receiving station.
The device decices when to send its message, picking up a pseudo-random frequency.
It's up to the network to detect the incoming messages, as well as validating & deduplicating them.
The message is then available in the Sigfox cloud, and forwarded to any 3rd party cloud platform chosen by the user.

Messages can be sent to the device as well. For energy efficiency reasons, every communication is instigated by the device.
This means that the device is not passively listening possible incoming data, but stays idle 99.x% of the time
A device can ask for an update from a network. Then it will go back to sleep from 20 secs, before starting to listen to a specific frequency.
The downlink message can be either a static one (hardcoded, or updated through API call), or a dynamic one sent instantly by the user's own application server.

Network Overview


Every message is signed, with information proper to the device (incl. a unique private key) and to the message itself.
This prevent spoofing, alteration or replay of genuine messages.
Encryption & scrambling of the data are supported, with the choice of the more appropriate solution up to the consumer.

Retrieving your data

You have 3 main ways to interact with the data you send to the Sigfox network :

  • Visual : through the backend.sigfox.com interface
  • API : a REST API allows you to pull your data & relevant stats
  • Callbacks : a webhook mechanism, that will push every new incoming message to your own application servers. Thes are fully customisable HTTPS requests : http method, headers, content-type, request body format

Certification Process

Radio Configuration Zones

The Sigfox network is relying on Ultra-Narrow Band(UNB) modulation, and operating in unlicensed sub-GHz frequency bands.
This protocol offer a great resistance to jamming & standard interferers, as well as a great capacity per receiving base stations Sigfox complies with local regulations, adjusting central frequency, power output and duty cycles.

Sigfox RCZ Countries Configuration Regulation
RCZ1 Europe, Iran, Oman, South Africa 868MHz, 14dBm output ETSI 300-220
RCZ2 USA, Mexico, Brazil 902MHz, 22dBm output FCC part 15
RCZ3 Japan 923MHz, 14dBm output ARIB STD-T108
RCZ4 Argentina, Colombia, Australia, New Zealand, Hong-Kong, Singapore, Taiwan 920MHz 22 dBm output ANATEL 506, AS/NZS 4268, IDA TS SRD