Registro.br (Núcleo de Informação e Coordenação do Ponto BR)

The single authoritative registry for all .br domains (over 5.3 million registered as of Sept 2024) — an outage here has an outsized, uniquely Brazil-specific blast radius since it can affect DNS resolution and domain-management access for a large share of the country's own web presence, distinct from the global cloud/CDN providers that dominate the rest of this category. No dedicated public status page found; monitoring the main site is the best available proxy.