MASTER S/A

MASTER S/A is a Brazil-based entity name that appears in public records in two distinct contexts: as the holder of telecom/ISP resources (AS28202) and as “Master S/A, Corretora de Câmbio, Títulos e Valores Mobiliários” (Master CCTVM) in the financial sector. Brazil’s Central Bank states that, on November 18, 2025, it decreed extrajudicial liquidation for Banco Master S/A and also for Master S/A CCTVM, among other entities in the “Conglomerado Master”.

The name MASTER S/A is associated with Autonomous System AS28202 in LACNIC/Registro.br WHOIS-derived datasets, with visible IPv4/IPv6 allocations and routes (examples include 191.53.0.0/16 and 2804:87c::/32). Multiple datasets and checks map AS28202 activity to Brazil, with some IP geolocation signals pointing to Osasco (SP); RPKI validity is also observable for at least part of the announced space (for example, 187.44.44.0/24).

Online complaint aggregators show a notable volume of user complaints tied to “Master Corretora / MASTER S/A Corretora”, commonly involving disputes about charges or records; sentiment there skews negative. For the ISP/network side under the same “MASTER S/A” label, consumer-style reviews are harder to isolate cleanly from the financial entity, so reputation signals are mixed and context-dependent.