Robtex

Up: 148.204.192.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 148.204.192.0/22
Down right: 148.204.196.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
148.204.193.81	PTR	pc-193-081.cecyt12.ipn.mx
148.204.193.81	A+PTR	www.saes.cecyt12.ipn.mx
148.204.193.81	PTR	www.cecyt12.saes.ipn.mx
148.204.195.5	PTR	pc-195-005.cecyt6.ipn.mx
148.204.195.5	A+PTR	www.saes.cecyt6.ipn.mx
148.204.195.5	PTR	www.cecyt6.saes.ipn.mx
148.204.195.6	PTR	pc-195-006.cecyt6.ipn.mx
148.204.195.6	PTR	www.cecyt6.ipn.mx
148.204.195.243	PTR	pc-195-243.cecyt6.ipn.mx
148.204.195.254	PTR	cecyt6-195.gw-ipn.ipn.mx
148.204.195.254	PTR	cecyt6.gw-ipn.ipn.mx
148.204.197.254	PTR	gw-ipn.ipn.mx
148.204.197.254	PTR	tezozomoc.gw-ipn.ipn.mx
148.204.198.2	A+PTR	dns2.ipn.mx
148.204.199.8	A+PTR	mail.oncetv.ipn.mx
148.204.199.8	PTR	oncetv-008.oncetv.ipn.mx
148.204.199.8	A	oncetvmexico.ipn.mx
148.204.199.185	A+PTR	canalonce.ipn.mx
148.204.199.185	A+PTR	www.canalonce.ipn.mx
148.204.199.185	PTR	oncetv-185.oncetv.ipn.mx
148.204.199.230	A	golem2.oncetv.ipn.mx
148.204.199.253	PTR	karnal11.ipn.mx
148.204.199.253	PTR	oncetv-253.oncetv.ipn.mx