Robtex

Up: 201.163.36.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 201.163.38.0/24
Down right: 201.163.39.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
201.163.38.177	PTR	static-201-163-38-177.alestra.net.mx
201.163.38.227	PTR	static-201-163-38-227.alestra.net.mx
201.163.38.227	A	wssgroup.com
201.163.38.227	A	dns.wssgroup.com
201.163.38.228	A+PTR	mail.wssgroup.com
201.163.38.228	A	www.wssgroup.com
201.163.38.228	A	wwwits2.wssgroup.com
201.163.38.229	PTR	mail2.wssgroup.com
201.163.39.2	A	mail.tmpmexico.com
201.163.39.45	PTR	static-201-163-39-45.alestra.net.mx
201.163.39.85	PTR	static-201-163-39-85.alestra.net.mx
201.163.39.85	A	pereyraenlinea.net
201.163.39.90	PTR	static-201-163-39-90.alestra.net.mx