Robtex

Up: 186.237.32.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 186.237.32.0/21
Down right: 186.237.40.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
186.237.32.206	PTR	206.32.237.186.in-addr.arpa
186.237.33.93	PTR	186.237.33.93
186.237.33.163	PTR	186.237.33.163
186.237.33.185	PTR	185.33.237.186.in-addr.arpa
186.237.34.88	PTR	88.34.237.186.in-addr.arpa
186.237.34.99	PTR	99.34.237.186.in-addr.arpa
186.237.35.157	PTR	157.west.com.br
186.237.35.224	PTR	186.237.35.224
186.237.36.38	PTR	186.237.36.38
186.237.36.135	PTR	186.237.36.135
186.237.36.211	PTR	211.west.com.br
186.237.37.12	PTR	186.237.37.12
186.237.37.111	PTR	186.237.37.111
186.237.37.142	PTR	186.237.37.142
186.237.37.191	PTR	186.237.37.191
186.237.37.229	PTR	229.37.237.186.in-addr.arpa
186.237.38.128	PTR	186.237.38.128
186.237.38.170	PTR	186.237.38.170
186.237.38.228	PTR	228.west.com.br
186.237.38.244	PTR	244.38.237.186.in-addr.arpa
186.237.38.249	PTR	249.38.237.186.in-addr.arpa
186.237.39.39	PTR	39.west.com.br
186.237.39.56	PTR	186.237.39.56
186.237.39.162	PTR	162.west.com.br
186.237.39.253	PTR	253.39.237.186.in-addr.arpa
186.237.41.113	PTR	186.237.41.113
186.237.41.114	PTR	186.237.41.114
186.237.41.118	PTR	118.41.237.186.in-addr.arpa
186.237.43.7	PTR	186.237.43.7.west.com.br
186.237.43.7	A	speedtest0.cbf.west.net.br
186.237.43.22	PTR	186.237.43.22.west.com.br
186.237.43.22	A	speedtestbzs0.cbf.west.net.br
186.237.43.24	PTR	186.237.43.24.west.com.br
186.237.43.24	A	ns1.west.net.br
186.237.43.37	A+PTR	leibniz.cbf.west.net.br
186.237.43.39	A+PTR	abel.cbf.west.net.br
186.237.43.41	A+PTR	lagrange.cbf.west.net.br
186.237.43.42	A+PTR	hilbert.cbf.west.net.br
186.237.43.86	PTR	186.237.43.86.west.com.br
186.237.43.86	A	occ-0-1864-1123.1.nflxso.net
186.237.43.86	A	occ-0-1864-1567.1.nflxso.net
186.237.46.124	PTR	186.237.46.124
186.237.46.143	PTR	186.237.46.143
186.237.46.179	PTR	186.237.46.179
186.237.47.118	PTR	186.237.47.118
186.237.47.139	PTR	186.237.47.139