Robtex

Up: 140.99.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 140.99.48.0/22
Down right: 140.99.52.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
140.99.48.6	A	mail.arroyocc.com
140.99.49.114	PTR	114.cereusdesign.com
140.99.49.114	A	gaileyfamily.com
140.99.49.114	A	mail.gaileyfamily.com
140.99.50.2	A	etfsmarketing.com
140.99.50.2	A	mail1.etfsmarketing.com
140.99.50.42	PTR	curealty.deru.com
140.99.50.48	PTR	network.inxsol.deru.com
140.99.50.90	PTR	90-rmastrapasqua.deru.com
140.99.50.122	A	dd.lufthans.com
140.99.50.129	PTR	scottsdale.deru.net
140.99.50.154	A	mail.lawdepartmentdesktop.com
140.99.50.162	PTR	cmdctrl.com
140.99.50.226	PTR	nigel.sindel.com
140.99.50.226	A	nigel.airmarketing.com
140.99.50.226	A	nigel.rosieonthehouse.com
140.99.50.227	PTR	227.sindel.com
140.99.51.2	PTR	2.adweb.deru.com
140.99.51.2	A	d1sapi.zuni-c.com
140.99.51.61	A	mail2.kellerelectricalindustries.com
140.99.51.61	A	mail2.kellerindustrialelectric.com
140.99.51.114	PTR	tuppy.intrepidhosting.net
140.99.51.114	A	mail.pdgconsult.com
140.99.51.130	PTR	dojiggy.com
140.99.51.132	A	mail2.synertechinc.com
140.99.52.21	A	*.unitedeng.com
140.99.52.42	A	mail.buycaforeclosures.com
140.99.52.225	PTR	ukko.deru.net
140.99.53.3	A	bkmail.venterspooner.com
140.99.53.8	A	mail.supernaturalfinances.com
140.99.53.8	A	mail.harrisonsmith.com
140.99.55.2	A	*.deervalleyconsulting.com
140.99.55.2	A	xmllogic.com
140.99.55.2	A	webservicecentral.com
140.99.55.8	PTR	network.loadbook.deru.com
140.99.55.25	PTR	tecdeal-gw.deru.com
140.99.55.56	PTR	ns1648.ztomy.com
140.99.55.57	PTR	globalchangemultimedia.org
140.99.55.58	PTR	globalchangemultimedia.org
140.99.55.59	PTR	globalchangemultimedia.org
140.99.55.64	PTR	network.welcome2france.deru.com
140.99.55.73	PTR	airtrantraining.com-gw.deru.com
140.99.55.232	PTR	advancednetx.com
140.99.55.240	PTR	advancednetx.com