Robtex

Up: 138.97.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 138.97.36.0/23
Down right: 138.97.38.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
138.97.36.0	PTR	138-97-36-0.fasttelecom.net.br
138.97.36.18	A	infranetworks.com.br
138.97.36.18	A	estripulia.com
138.97.36.18	A	tecfuse.com.br
138.97.36.19	PTR	138-97-36-19.fasttelecom.net.br
138.97.36.19	PTR	ns2.fasttelecom.net.br
138.97.36.19	A	ns2.northserver2.com.br
138.97.36.20	PTR	ns1.fasttelecom.net.br
138.97.36.20	A	ns2.northserver2.com.br
138.97.36.20	A	lojamilmaquinas.com.br
138.97.36.178	A+PTR	dns.birigui.sp.gov.br
138.97.36.178	A	birigui.sp.gov.br
138.97.36.178	A	smtp.birigui.sp.gov.br
138.97.36.179	A	netproxy.birigui.sp.gov.br
138.97.39.247	PTR	138-97-39-247.fasttelecom.net.br
138.97.39.255	PTR	138-97-39-255.fasttelecom.net.br