Robtex

Up: 189.51.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 189.51.140.0/23
Down right: 189.51.142.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
189.51.140.42	PTR	ns1.fasthospedagens.com.br
189.51.143.14	PTR	one.ktudu.com
189.51.143.14	A	ns2.fun3d.com.br
189.51.143.14	A	ns2.ktudu.com
189.51.143.21	A	tntedu.com.br
189.51.143.115	A	one.ktudu.com
189.51.143.115	A	mail.e-neural.com
189.51.143.115	A	mail.ktudu.com