Robtex

Up: 140.99.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 140.99.48.0/23
Down right: 140.99.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
140.99.48.6	A	mail.arroyocc.com
140.99.48.71	PTR	71-banet.com
140.99.48.220	PTR	220-banet.com
140.99.49.114	PTR	114.cereusdesign.com
140.99.49.114	A	gaileyfamily.com
140.99.49.114	A	mail.gaileyfamily.com
140.99.49.196	PTR	mssql2.deru.net
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
140.99.50.54	PTR	54.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
140.99.50.237	PTR	237.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
140.99.51.126	PTR	ajo.mr72.com
140.99.51.130	PTR	dojiggy.com
140.99.51.132	A	mail2.synertechinc.com