Robtex

Up: 131.161.104.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 131.161.105.0/25
Down right: 131.161.105.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
131.161.105.34	PTR	131-161-105-34.rev.netcorporativa.com.br
131.161.105.50	A+PTR	131-161-105-50.rev.netcorporativa.com.br
131.161.105.105	A+PTR	131-161-105-105.rev.netcorporativa.com.br
131.161.105.206	A+PTR	131-161-105-206.rev.netcorporativa.com.br
131.161.105.218	PTR	131-161-105-218.rev.netcorporativa.com.br
131.161.105.218	A	ns02.ultra.pro.br
131.161.105.219	A+PTR	131-161-105-219.rev.netcorporativa.com.br
131.161.105.219	A	ns02.noroestenet.com.br
131.161.105.219	A	w3bc.ultra.pro.br
131.161.105.242	A+PTR	131-161-105-242.rev.netcorporativa.com.br