Robtex

Up: 200.78.184.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 200.78.188.0/23
Down right: 200.78.190.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
200.78.188.6	A+PTR	na-200-78-188-6.static.avantel.net.mx
200.78.188.17	A+PTR	na-200-78-188-17.static.avantel.net.mx
200.78.188.18	A+PTR	na-200-78-188-18.static.avantel.net.mx
200.78.188.25	A+PTR	na-200-78-188-25.static.avantel.net.mx
200.78.188.38	A+PTR	na-200-78-188-38.static.avantel.net.mx
200.78.188.41	A+PTR	na-200-78-188-41.static.avantel.net.mx
200.78.188.46	A+PTR	na-200-78-188-46.static.avantel.net.mx
200.78.188.50	PTR	oasis-open.org
200.78.188.51	PTR	oasis-open.org
200.78.188.52	PTR	oasis-open.org
200.78.188.53	PTR	oasis-open.org
200.78.188.54	PTR	oasis-open.org
200.78.188.55	A+PTR	na-200-78-188-55.static.avantel.net.mx
200.78.188.56	A+PTR	na-200-78-188-56.static.avantel.net.mx
200.78.188.57	A+PTR	na-200-78-188-57.static.avantel.net.mx
200.78.188.62	A+PTR	na-200-78-188-62.static.avantel.net.mx
200.78.188.69	A+PTR	na-200-78-188-69.static.avantel.net.mx
200.78.188.73	A+PTR	na-200-78-188-73.static.avantel.net.mx
200.78.188.74	A+PTR	na-200-78-188-74.static.avantel.net.mx
200.78.188.79	A+PTR	na-200-78-188-79.static.avantel.net.mx
200.78.188.81	A+PTR	na-200-78-188-81.static.avantel.net.mx
200.78.188.85	A+PTR	na-200-78-188-85.static.avantel.net.mx
200.78.188.86	A+PTR	na-200-78-188-86.static.avantel.net.mx
200.78.188.94	A+PTR	na-200-78-188-94.static.avantel.net.mx
200.78.188.96	A+PTR	na-200-78-188-96.static.avantel.net.mx
200.78.188.99	PTR	na-200-78-188-99.static.avantel.net.mx
200.78.188.101	A+PTR	na-200-78-188-101.static.avantel.net.mx
200.78.188.102	A+PTR	na-200-78-188-102.static.avantel.net.mx
200.78.188.105	A+PTR	na-200-78-188-105.static.avantel.net.mx
200.78.188.107	A+PTR	na-200-78-188-107.static.avantel.net.mx
200.78.188.115	A+PTR	na-200-78-188-115.static.avantel.net.mx
200.78.188.119	A+PTR	na-200-78-188-119.static.avantel.net.mx
200.78.188.120	PTR	na-200-78-188-120.static.avantel.net.mx
200.78.188.121	A+PTR	na-200-78-188-121.static.avantel.net.mx
200.78.188.123	A+PTR	na-200-78-188-123.static.avantel.net.mx
200.78.188.128	A+PTR	na-200-78-188-128.static.avantel.net.mx
200.78.188.129	A+PTR	na-200-78-188-129.static.avantel.net.mx
200.78.188.131	A+PTR	na-200-78-188-131.static.avantel.net.mx
200.78.188.136	A+PTR	na-200-78-188-136.static.avantel.net.mx
200.78.188.137	PTR	df-gti-postal.diavaz.com.mx
200.78.188.140	A+PTR	na-200-78-188-140.static.avantel.net.mx
200.78.188.150	A+PTR	na-200-78-188-150.static.avantel.net.mx
200.78.188.154	A+PTR	na-200-78-188-154.static.avantel.net.mx
200.78.188.156	A+PTR	na-200-78-188-156.static.avantel.net.mx
200.78.188.157	A+PTR	na-200-78-188-157.static.avantel.net.mx
200.78.188.158	A+PTR	na-200-78-188-158.static.avantel.net.mx
200.78.188.163	A+PTR	na-200-78-188-163.static.avantel.net.mx
200.78.188.165	A+PTR	na-200-78-188-165.static.avantel.net.mx
200.78.188.171	A+PTR	na-200-78-188-171.static.avantel.net.mx
200.78.188.178	A+PTR	na-200-78-188-178.static.avantel.net.mx
200.78.188.187	A+PTR	na-200-78-188-187.static.avantel.net.mx
200.78.188.201	A+PTR	na-200-78-188-201.static.avantel.net.mx
200.78.188.202	A+PTR	na-200-78-188-202.static.avantel.net.mx
200.78.188.203	A+PTR	na-200-78-188-203.static.avantel.net.mx
200.78.188.204	A+PTR	na-200-78-188-204.static.avantel.net.mx
200.78.188.214	A+PTR	na-200-78-188-214.static.avantel.net.mx
200.78.188.215	A+PTR	na-200-78-188-215.static.avantel.net.mx
200.78.188.219	A+PTR	na-200-78-188-219.static.avantel.net.mx
200.78.188.220	A+PTR	na-200-78-188-220.static.avantel.net.mx
200.78.188.221	A+PTR	na-200-78-188-221.static.avantel.net.mx
200.78.188.229	A+PTR	na-200-78-188-229.static.avantel.net.mx
200.78.188.231	A+PTR	na-200-78-188-231.static.avantel.net.mx
200.78.188.242	A+PTR	na-200-78-188-242.static.avantel.net.mx
200.78.188.246	A+PTR	na-200-78-188-246.static.avantel.net.mx
200.78.188.248	A+PTR	na-200-78-188-248.static.avantel.net.mx
200.78.188.251	A+PTR	na-200-78-188-251.static.avantel.net.mx
200.78.188.255	A+PTR	na-200-78-188-255.static.avantel.net.mx
200.78.189.9	A+PTR	www.avantel.net
200.78.189.9	PTR	panelc.domain1.com.mx
200.78.189.9	PTR	webhosting.domain1.com.mx
200.78.190.50	A+PTR	na-200-78-190-50.static.avantel.net.mx
200.78.190.50	A	acfenomina.com.mx
200.78.190.52	A	igomexico.net
200.78.190.146	A+PTR	na-200-78-190-146.static.avantel.net.mx
200.78.191.46	PTR	na-200-78-191-46.static.avantel.net.mx
200.78.191.46	A	dns1.grupo-eu.com.mx
200.78.191.238	A+PTR	micorreo.ayvi.com.mx