Robtex

Up: 186.250.248.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 186.250.248.0/23
Down right: 186.250.250.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
186.250.248.0	PTR	186.250.248.0.frontnet.com.br
186.250.249.4	A	www.globalnet.net.br
186.250.249.4	A	dns1.tecnologika.com.br
186.250.249.4	A	tecnologika.com.br
186.250.249.12	A+PTR	ns1.frontnet.com.br
186.250.249.13	A+PTR	ns2.frontnet.com.br
186.250.249.18	A+PTR	frontmail.frontnet.com.br
186.250.249.18	A+PTR	webmail.frontnet.com.br
186.250.251.255	PTR	cliente-251-255.computeknica.com.br