Robtex

Up: 131.255.88.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 131.255.88.0/23
Down right: 131.255.90.0/23

IP	Type	Hostname
131.255.88.1	A+PTR	www.rptelecom.com.br
131.255.88.1	A	rptelecom.com.br
131.255.88.2	A+PTR	ns1.rptelecom.com.br
131.255.88.3	A+PTR	email.rptelecom.com.br
131.255.88.4	A+PTR	ns2.rptelecom.com.br
131.255.88.6	A	ns1.rptelecom.com.br
131.255.88.7	PTR	131.255.88.7.rptelecom.com.br
131.255.88.7	A	ns2.rptelecom.com.br
131.255.91.255	PTR	131.255.91.255.rptelecom.com.br