Robtex

Up: 138.97.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 138.97.64.0/23
Down right: 138.97.66.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
138.97.64.0	PTR	138-97-64-0.westlink.net.br
138.97.64.4	PTR	bras03.westlink.net.br
138.97.64.4	A	bras02.westlink.net.br
138.97.64.5	A+PTR	bras06.westlink.net.br
138.97.64.26	A+PTR	138-97-64-26.westlink.net.br
138.97.64.28	A	dns1.westlink.net.br
138.97.64.37	A+PTR	138-97-64-37.westlink.net.br
138.97.64.81	A+PTR	138-97-64-81.westlink.net.br
138.97.64.82	A+PTR	138-97-64-82.westlink.net.br
138.97.64.91	PTR	dns1.westlink.net.br
138.97.64.93	A+PTR	ns1.westlink.net.br
138.97.64.93	A	srv01.udns.com.br
138.97.64.93	A	ns6.udns.com.br
138.97.64.94	PTR	ns2.westlink.net.br
138.97.64.94	A	ns6.udns.com.br
138.97.64.97	PTR	rs.westlink.net.br
138.97.64.97	A	138-97-64-97.westlink.net.br
138.97.64.97	A	rs1.westlink.net.br
138.97.64.98	A+PTR	138-97-64-98.westlink.net.br
138.97.64.111	PTR	srv91.tmsoft.com.br
138.97.64.111	A	ns6.udns.com.br
138.97.64.111	A	mail.vyos.net.br
138.97.64.112	PTR	srv92.tmsoft.com.br
138.97.64.112	A	ns6.udns.com.br
138.97.64.112	A	mail.vyos.net.br
138.97.64.130	A+PTR	138-97-64-130.westlink.net.br
138.97.64.130	A	bekman.com.br
138.97.64.133	A+PTR	138-97-64-133.westlink.net.br
138.97.64.134	A+PTR	138-97-64-134.westlink.net.br
138.97.64.140	A+PTR	138-97-64-140.westlink.net.br
138.97.64.245	A	bras06.westlink.net.br
138.97.65.4	A+PTR	138-97-65-4.westlink.net.br
138.97.66.0	PTR	138-97-66-0.westlink.net.br
138.97.66.48	A+PTR	fox.maximumti.com.br
138.97.66.48	A	maximumti.com.br
138.97.66.48	A	mail.clickdownz.com.br
138.97.66.113	A+PTR	138-97-66-113.westlink.net.br
138.97.66.142	A+PTR	138-97-66-142.westlink.net.br
138.97.66.247	A+PTR	138-97-66-247.westlink.net.br
138.97.67.255	PTR	138-97-67-255.westlink.net.br