n4b.net
Business networking platforms, referral networks and industry associations all fit a name reading as network for business, and the .net extension is literally accurate for any of them.
N4B also reads as nodes for blockchain or news for business, the latter suiting a trade publication or briefing service where the audience is professional and arrives by subscription.
The underlying case is the one every three-character name carries: supply is fixed, demand isn’t. New companies form continuously, each needs a name, and the shortest usable lengths were fully claimed decades ago. What circulates is only what existing holders release, and most of them don’t.
Short, structured, no spelling ambiguity, fits anywhere.
The name is available. Offers considered.