Definition
AREDN (Amateur Radio Emergency Data Network) is open-source firmware, based on OpenWrt, that converts inexpensive commercial WiFi routers and radios into nodes of a self-configuring amateur-radio mesh network. Operated under amateur (ham) radio licensing, AREDN lets licensed operators stand up high-throughput data networks that run entirely independent of internet and cellular infrastructure — exactly the kind of fallback a sovereignty-minded operator wants when commercial links fail.
How the mesh forms
AREDN nodes discover each other and build routes automatically. Recent production releases retired the legacy OLSR protocol in favor of Babel routing, and the large majority of nodes worldwide now run Babel-based firmware. With directional antennas and amplifiers operating in amateur allocations near the 2.4 GHz and other bands, reliable links can span many miles, limited mainly by terrain and the radio horizon. Because the mesh is fault tolerant and self-healing, nodes can join or drop without manual reconfiguration.
Why operators run it
AREDN supports common gear from vendors such as Ubiquiti, MikroTik, and TP-Link, installed via TFTP for new devices or a sysupgrade image for existing ones. It is widely used for emergency communications, but the same properties — no provider, no monthly bill, no kill switch — make it valuable for routine off-grid data, file transfer, and reaching remote sites. Note that amateur-band operation forbids encryption of message content, so AREDN is about resilient reach, not privacy.
AREDN grew out of the same lineage as Broadband-Hamnet (HSMM-Mesh) and pairs well with longer-range packet radio links for store-and-forward traffic.
In Simple Terms
AREDN (Amateur Radio Emergency Data Network) is open-source firmware, based on OpenWrt, that converts inexpensive commercial WiFi routers and radios into nodes of a self-configuring…