191.33.0.0/19 covers 191.33.0.0 to 191.33.31.255, 8,192 IPv4 addresses. It is announced by AS18881 (Telefônica Brasil S.A.). Every sampled address geolocates to Brazil, with 75% in Rio de Janeiro. It is registered to an internet service provider. 3% of sampled addresses are flagged as proxy.