Robtex

Up: 201.131.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 201.131.13.0/25
Down right: 201.131.13.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
201.131.13.6	A+PTR	ns3.metalsa.com
201.131.13.15	A+PTR	ns1.metalsa.com
201.131.13.15	A	ns1.grupometalsa.com.mx
201.131.13.24	A+PTR	smtp1.metalsa.com.mx
201.131.13.24	A	smtp1.metalsa.com
201.131.13.24	A	mail2.proeza.com.mx
201.131.13.25	PTR	smtp2.metalsa.com.mx
201.131.13.25	A	smtp2.metalsa.com
201.131.13.25	A	smtp2.perfektools.com
201.131.13.55	A	www.zanet.com.mx
201.131.13.58	A	mail.metalsa.com
201.131.13.59	A	autodiscover.metalsa.com
201.131.13.70	A	www.metalsa.com
201.131.13.70	A	www.tlproeza.com
201.131.13.87	A	cloud.metalsa.com
201.131.13.105	A	appapo4.metalsa.com.mx
201.131.13.105	A	www.metalsa.com.mx
201.131.13.109	A	ftp.metalsa.com.mx