AREDN 2026 update from Orv W6BI:

Changes from 11/1/2025 Total Nodes: 2113.
Over the last few months nodes visible to the mapper have bounced around a lot.
They dropped from about 2800 in the spring of last year to a low of around 2,000 in November, but have started to rise again.
This volatility is probably due to the migration of nodes from OLSR-only to Babel+OLSR to (in some places) Babel-only. XM nodes (devices with only 32MB of RAM, and
thus not capable of running the Babel routing protocol) visible to the mapper have dropped to almost zero. 
Part of this is probably retirement of these old hardwares, but also due to the fact that almost 40% of the supernodes
have migrated to Babel-only software and thus OLSR-only nodes behind them aren't propagating. Babel-enabled nodes: 2064 - up from 1973 in early November. % Babel-enabled - 98% - same as in November (the percentage is the same because the total node count has also risen) Babel-only nodes: 614 (29%) - up from 363 in November NOTES:
  •  If you've got nodes on 3.25.2.0 or earlier, it's recommended that you get them updated so they're visible again to the mapper and to the greater network.
  • The next production release is anticipated to be later in January and will probably be 4.26.1.0. The '4' indicates a protocol change and that's due to OLSR being dropped from the software.  If nodes in your local network are running 3.25.5.0 or higher, updating to the 4.26.1.0 firmware will most likely be a non-event (except for maybe improved network stability).
73 The AREDN Team