Robtex

Up: 201.156.8.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 201.156.8.0/25
Down right: 201.156.8.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
201.156.8.2	A+PTR	na-201-156-8-2.static.avantel.net.mx
201.156.8.3	A+PTR	na-201-156-8-3.static.avantel.net.mx
201.156.8.5	A	na-201-156-8-5.static.avantel.net.mx
201.156.8.8	A+PTR	na-201-156-8-8.static.avantel.net.mx
201.156.8.11	A+PTR	na-201-156-8-11.static.avantel.net.mx
201.156.8.37	A	na-201-156-8-37.static.avantel.net.mx
201.156.8.41	PTR	na-201-156-8-41.static.avantel.net.mx
201.156.8.61	A+PTR	na-201-156-8-61.static.avantel.net.mx
201.156.8.65	A	na-201-156-8-65.static.avantel.net.mx
201.156.8.68	PTR	na-201-156-8-68.static.avantel.net.mx
201.156.8.71	A	na-201-156-8-71.static.avantel.net.mx
201.156.8.72	PTR	na-201-156-8-72.static.avantel.net.mx
201.156.8.76	A	na-201-156-8-76.static.avantel.net.mx
201.156.8.77	PTR	na-201-156-8-77.static.avantel.net.mx
201.156.8.78	PTR	na-201-156-8-78.static.avantel.net.mx
201.156.8.83	A	na-201-156-8-83.static.avantel.net.mx
201.156.8.92	A	na-201-156-8-92.static.avantel.net.mx
201.156.8.108	PTR	na-201-156-8-108.static.avantel.net.mx
201.156.8.108	A	corporativorevolucion.com
201.156.8.108	A	ns.esolisd.org
201.156.8.115	PTR	na-201-156-8-115.static.avantel.net.mx
201.156.8.117	PTR	na-201-156-8-117.static.avantel.net.mx
201.156.8.132	A	na-201-156-8-132.static.avantel.net.mx
201.156.8.141	A	na-201-156-8-141.static.avantel.net.mx
201.156.8.147	PTR	na-201-156-8-147.static.avantel.net.mx
201.156.8.151	A+PTR	na-201-156-8-151.static.avantel.net.mx
201.156.8.156	PTR	na-201-156-8-156.static.avantel.net.mx
201.156.8.175	A	na-201-156-8-175.static.avantel.net.mx
201.156.8.185	A+PTR	na-201-156-8-185.static.avantel.net.mx
201.156.8.191	A+PTR	na-201-156-8-191.static.avantel.net.mx
201.156.8.192	A+PTR	na-201-156-8-192.static.avantel.net.mx
201.156.8.200	A+PTR	na-201-156-8-200.static.avantel.net.mx
201.156.8.204	PTR	na-201-156-8-204.static.avantel.net.mx
201.156.8.205	PTR	na-201-156-8-205.static.avantel.net.mx
201.156.8.209	A	na-201-156-8-209.static.avantel.net.mx
201.156.8.250	A+PTR	na-201-156-8-250.static.avantel.net.mx
201.156.8.252	PTR	na-201-156-8-252.static.avantel.net.mx