Robtex

Up: 138.36.102.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 138.36.102.0/25
Down right: 138.36.102.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
138.36.102.130	PTR	syn-0-0-01.edge.syncontel.net.br
138.36.102.130	A	pop.syncontel.net.br
138.36.102.130	A	net.syncontel.net.br
138.36.102.131	PTR	131-102-36-138.syncontel.net.br
138.36.102.131	A	ns2.syncontel.net.br