n4d.net
Research and education networks, regional connectivity initiatives, and consortia pooling infrastructure across countries are real institutional structures, and several already name themselves in this exact form.
N4D reads as network for development, with the .net extension literally accurate for a network.
Other readings hold up without strain: nodes for developers, news for democracy, notifications for devices. The 4-as-for convention carries any of them.
The underlying asset is three characters on a major extension, a set that closed decades ago. What circulates is what existing holders release, and the trend is toward fewer rather than more.
Short, parseable, legible to both a technical audience and an institutional one.
Offers considered.