Robtex

Up: 192.100.200.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.100.201.0/25
Down right: 192.100.201.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.100.201.2	PTR	vweb02up.academic.mixcoac.upmx.mx
192.100.201.2	A	monitorea.upmx.mx
192.100.201.2	A	terraza.up.edu.mx
192.100.201.30	PTR	dns01bup.academic.mixcoac.upmx.mx
192.100.201.30	A	mex1.up.mx
192.100.201.30	A	dns1.prepaup.mx
192.100.201.33	A+PTR	ras06up.academic.mixcoac.upmx.mx
192.100.201.33	A	vpn.up.edu.mx
192.100.201.63	PTR	proxyti3.academic.mixcoac.upmx.mx
192.100.201.67	A	dc19up.academic.mixcoac.upmx.mx
192.100.201.68	A+PTR	web01-upsite.academic.mixcoac.upmx.mx
192.100.201.149	A+PTR	webactipanwpad.academic.mixcoac.upmx.mx
192.100.201.153	A+PTR	crm02-upsite.academic.mixcoac.upmx.mx
192.100.201.165	A	upmemories.up.edu.mx
192.100.201.178	A+PTR	examen.up.edu.mx
192.100.201.178	A	admisiones.up.edu.mx
192.100.201.191	PTR	test.drp.up.edu.mx
192.100.201.191	PTR	test201.drp.up.edu.mx
192.100.201.191	PTR	test.test.up.edu.mx
192.100.201.200	PTR	borrame1.up.edu.mx
192.100.201.200	A	ntp1.up.edu.mx
192.100.201.205	A	moodle.up.edu.mx
192.100.201.211	A	web06-upsite.academic.mixcoac.upmx.mx
192.100.201.220	A	www.esdai.edu.mx
192.100.201.220	A	bolsadetrabajo.up.edu.mx
192.100.201.220	A	cov.up.edu.mx
192.100.201.221	A+PTR	analiza01up.academic.mixcoac.upmx.mx
192.100.201.222	A	web04-upsite.academic.mixcoac.upmx.mx
192.100.201.235	A+PTR	aplicaciones01.up.edu.mx
192.100.201.235	PTR	app02up.academic.mixcoac.upmx.mx
192.100.201.235	A	app01up.academic.mixcoac.upmx.mx
192.100.201.239	PTR	web02ti.academic.mixcoac.upmx.mx
192.100.201.239	A	www.opusdei.mx
192.100.201.239	A	yaocalli.edu.mx