Robtex

Up: 201.151.144.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 201.151.152.0/22
Down right: 201.151.156.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
201.151.153.104	PTR	static-201-151-153-104.alestra.net.mx
201.151.153.104	A	imaxdelnorte.com
201.151.155.2	PTR	static-201-151-155-2.alestra.net.mx
201.151.156.2	PTR	smtp.assetel.com
201.151.156.2	A	mail.fm200.com.mx
201.151.156.2	A	arnet.com.mx
201.151.156.3	PTR	xcs.assetel.com
201.151.156.123	PTR	static-201-151-156-123.alestra.net.mx
201.151.156.123	A	gdl2.mx.up.mx
201.151.156.123	A	gdl2.bonaterra.edu.mx
201.151.156.130	PTR	static-201-151-156-130.alestra.net.mx
201.151.156.130	A	timetracking.pounceconsulting.com
201.151.156.134	A	mail.pounceconsulting.com
201.151.156.134	A	owa.pounceconsulting.com
201.151.156.142	A	mail.pounceconsulting.com
201.151.156.166	PTR	static-201-151-156-166.alestra.net.mx
201.151.156.166	A	incomesource.com.mx
201.151.156.167	PTR	mxga.mx
201.151.156.167	A	mxga.net
201.151.156.167	A	star360bites.com
201.151.156.170	PTR	static-201-151-156-170.alestra.net.mx
201.151.156.170	A	lijasyabrasivos-trali.com.mx
201.151.156.170	A	mail.agenciaaym.com
201.151.156.171	PTR	static-201-151-156-171.alestra.net.mx
201.151.156.172	PTR	static-201-151-156-172.alestra.net.mx
201.151.156.173	PTR	static-201-151-156-173.alestra.net.mx
201.151.156.177	PTR	static-201-151-156-177.alestra.net.mx
201.151.156.177	A	directoriotecate.com
201.151.156.177	A	mail.lacervestragon.com
201.151.156.182	PTR	static-201-151-156-182.alestra.net.mx
201.151.156.183	PTR	static-201-151-156-183.alestra.net.mx
201.151.156.184	PTR	static-201-151-156-184.alestra.net.mx
201.151.156.184	A	mxceragem.com
201.151.156.185	PTR	static-201-151-156-185.alestra.net.mx
201.151.156.185	A	darcomunicaciones.com.mx
201.151.156.185	A	recursossistematicos.com
201.151.156.186	PTR	static-201-151-156-186.alestra.net.mx
201.151.156.187	PTR	static-201-151-156-187.alestra.net.mx
201.151.157.3	PTR	static-201-151-157-3.alestra.net.mx
201.151.157.5	PTR	static-201-151-157-5.alestra.net.mx
201.151.157.14	PTR	static-201-151-157-14.alestra.net.mx
201.151.157.40	A	hyline.com.mx
201.151.157.54	PTR	static-201-151-157-54.alestra.net.mx
201.151.157.54	A	kugphubanda.com
201.151.157.124	PTR	static-201-151-157-124.alestra.net.mx
201.151.157.124	A	www.tvctepa.com
201.151.157.125	PTR	static-201-151-157-125.alestra.net.mx
201.151.157.125	A	mail.tvctepa.com
201.151.157.125	A	webmail.tvctepa.com
201.151.158.1	PTR	srvpr01.radiogrupo.com.mx
201.151.158.2	PTR	static-201-151-158-2.alestra.net.mx
201.151.158.4	PTR	static-201-151-158-4.alestra.net.mx
201.151.158.17	PTR	static-201-151-158-17.alestra.net.mx
201.151.158.18	PTR	static-201-151-158-18.alestra.net.mx
201.151.158.19	PTR	static-201-151-158-19.alestra.net.mx
201.151.158.33	PTR	static-201-151-158-33.alestra.net.mx
201.151.158.64	PTR	static-201-151-158-64.alestra.net.mx
201.151.158.66	PTR	static-201-151-158-66.alestra.net.mx
201.151.158.88	PTR	static-201-151-158-88.alestra.net.mx
201.151.158.89	PTR	static-201-151-158-89.alestra.net.mx
201.151.158.90	PTR	static-201-151-158-90.alestra.net.mx
201.151.158.96	PTR	static-201-151-158-96.alestra.net.mx
201.151.158.97	PTR	static-201-151-158-97.alestra.net.mx
201.151.158.98	PTR	static-201-151-158-98.alestra.net.mx
201.151.158.99	PTR	static-201-151-158-99.alestra.net.mx
201.151.158.101	A	sitiocorporativo.com
201.151.158.101	A	benol.com.mx
201.151.158.101	A	reyma.mx
201.151.158.105	PTR	static-201-151-158-105.alestra.net.mx
201.151.158.106	PTR	static-201-151-158-106.alestra.net.mx
201.151.158.107	PTR	static-201-151-158-107.alestra.net.mx
201.151.158.115	PTR	static-201-151-158-115.alestra.net.mx
201.151.158.120	PTR	static-201-151-158-120.alestra.net.mx
201.151.158.138	PTR	static-201-151-158-138.alestra.net.mx
201.151.158.139	PTR	static-201-151-158-139.alestra.net.mx
201.151.158.144	PTR	static-201-151-158-144.alestra.net.mx
201.151.158.153	PTR	static-201-151-158-153.alestra.net.mx
201.151.158.154	PTR	static-201-151-158-154.alestra.net.mx
201.151.158.162	PTR	static-201-151-158-162.alestra.net.mx
201.151.158.176	PTR	static-201-151-158-176.alestra.net.mx
201.151.158.185	PTR	static-201-151-158-185.alestra.net.mx
201.151.158.186	PTR	static-201-151-158-186.alestra.net.mx
201.151.158.192	PTR	static-201-151-158-192.alestra.net.mx
201.151.158.194	PTR	static-201-151-158-194.alestra.net.mx
201.151.158.210	PTR	static-201-151-158-210.alestra.net.mx
201.151.158.211	PTR	static-201-151-158-211.alestra.net.mx
201.151.158.212	A	email.hospitalsanjavier.com
201.151.158.226	PTR	static-201-151-158-226.alestra.net.mx
201.151.158.243	PTR	static-201-151-158-243.alestra.net.mx
201.151.158.248	PTR	static-201-151-158-248.alestra.net.mx
201.151.158.250	PTR	static-201-151-158-250.alestra.net.mx
201.151.159.18	PTR	mail.isasaleon.com.mx
201.151.159.18	A	isasaleon.com.mx
201.151.159.18	A	dns5.isasa.com.mx
201.151.159.26	A	zb.elsurtidor.com
201.151.159.26	A	zb.softapatio.mx
201.151.159.26	A	elsurtidor.com
201.151.159.27	PTR	static-201-151-159-27.alestra.net.mx
201.151.159.27	A	reyjulien.elsurtidor.com
201.151.159.38	PTR	static-201-151-159-38.alestra.net.mx
201.151.159.66	A	e2.itrmexico.com.mx
201.151.159.128	PTR	static-201-151-159-128.alestra.net.mx
201.151.159.138	PTR	static-201-151-159-138.alestra.net.mx
201.151.159.163	A+PTR	mail.celay.com.mx
201.151.159.163	A	servmail.celay.com.mx
201.151.159.163	A	celay.com.mx
201.151.159.164	PTR	static-201-151-159-164.alestra.net.mx
201.151.159.187	A	uileon.edu.mx
201.151.159.222	A	hosting.tisolucionesglobales.com
201.151.159.222	A	mail.bombasyequiposlimon.com
201.151.159.222	A	mail3.hinojosa.com