Robtex

Up: 143.0.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 143.0.148.0/23
Down right: 143.0.150.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
143.0.148.8	PTR	8.148.0.143.rocketnet.com.br
143.0.148.157	PTR	157.148.0.143.rocketnet.com.br
143.0.148.180	PTR	180.148.0.143.rocketnet.com.br
143.0.148.191	PTR	191.148.0.143.rocketnet.com.br
143.0.151.13	PTR	www.funep.com.br
143.0.151.13	A	funep.com.br
143.0.151.14	A	arsveterinaria.org.br
143.0.151.36	A+PTR	core1.velocetelecom.com.br
143.0.151.58	A+PTR	ns1.velocetelecom.com.br
143.0.151.58	A	velocetelecom.com.br
143.0.151.59	PTR	59.151.0.143.rocketnet.com.br
143.0.151.59	A	ns2.velocetelecom.com.br
143.0.151.180	A+PTR	smtp.camarajaboticabal.sp.gov.br
143.0.151.180	A	mail.jaboticabal.sp.leg.br
143.0.151.180	A	jaboticabal.sp.leg.br
143.0.151.183	PTR	183.151.0.143.rocketnet.com.br
143.0.151.193	PTR	193.151.0.143.rocketnet.com.br
143.0.151.193	A	murilo.net.br
143.0.151.248	A+PTR	ns1.rocketnet.com.br
143.0.151.249	A+PTR	ns2.rocketnet.com.br
143.0.151.252	PTR	252.151.0.143.rocketnet.com.br
143.0.151.252	A	sp.rocketnet.com.br