131.0.28.0/23 covers 131.0.28.0 to 131.0.29.255, 512 IPv4 addresses. It is announced by AS28210 (Giga Mais Fibra Telecomunicacoes S.A.). Every sampled address geolocates to Brazil, with 50% in Guapimirim. It is registered to an internet service provider. 9% of sampled addresses are flagged as proxy.