What does an IP country of Brazil mean?
A database placed the address in Brazil. LACNIC is the registry. Claro, Vivo, and TIM operate large retail ASNs. AS7738 is V.tal, the wholesale network that absorbed much of Oi’s fiber.
BR
IP addresses in Brazil
What a geolocation country of Brazil tends to mean, and which networks sit behind it.
Brazil is a LACNIC country. The large retail ASNs include Claro NXT AS28573, Telefônica Brasil (Vivo) AS26599, and TIM AS26615. AS7738 is registered to V.tal, the wholesale fiber network that took over a large part of Oi’s infrastructure, so an “Oi” memory and a V.tal ASN can be the same line. A lookup that names Brazil and one of those networks is a normal consumer path. A lookup that names Brazil and a foreign cloud ASN is a server in São Paulo, not a household.
CGNAT is ordinary on Brazilian broadband, not an edge case, because the IPv4 pool could not cover the customer base. IPv6 is widely deployed by the same operators, so a line can have a usable IPv6 prefix and a shared IPv4 at the same time. Geolocation that says São Paulo or Rio de Janeiro is often the POP the database knows, particularly for a shared pool. Compare the router WAN address with the public address before you assume the city pin explains the connection.
The regional registry is LACNIC. What is my IP address · IP location wrong?
Further reading: Cloudflare Radar.
Questions
Is CGNAT common in Brazil?
Yes on consumer plans. IPv4 shortage pushed the large ISPs onto shared IPv4, with IPv6 alongside it on many of those same networks.