Robtex

Up: 131.108.122.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 131.108.123.0/25
Down right: 131.108.123.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
131.108.123.2	PTR	dns1.br7.net.br
131.108.123.2	A	h.microfap.net.br
131.108.123.2	A	e.microfap.net.br
131.108.123.3	PTR	dns2.br7.net.br
131.108.123.3	A	b.microfap.net.br
131.108.123.3	A	d.microfap.net.br
131.108.123.4	A+PTR	ns1.br7.net.br
131.108.123.4	A	ns1.microfap.net.br
131.108.123.4	A	ns1.br7telecom.net.br
131.108.123.5	A+PTR	ns2.br7.net.br
131.108.123.5	A	ns2.microfap.net.br
131.108.123.5	A	ns2.br7telecom.net.br
131.108.123.253	PTR	core.central-131-108-123-253.microfap.net.br
131.108.123.255	PTR	ip-131-108-123-255.br7.net.br