Robtex

Up: 189.45.248.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 189.45.248.0/23
Down right: 189.45.250.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
189.45.248.170	PTR	189-45-248-170.ibtelecom.net.br
189.45.248.171	PTR	cluster-mssql.ibtelecom.net.br
189.45.248.176	PTR	189.45.248.176.lte.tgn.network
189.45.248.176	A	mail.municipios.org.br
189.45.248.176	A	mail.febam.org.br
189.45.248.179	PTR	189-45-248-179.ibtelecom.net.br
189.45.248.179	A	barradoscoqueiros.se.gov.br
189.45.249.17	PTR	189-45-249-17.ibtelecom.net.br
189.45.251.20	PTR	189-45-251-20.ibtelecom.net.br
189.45.251.229	PTR	189.45.251.229.lte.tgn.network