Robtex

Up: 140.99.16.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 140.99.16.0/24
Down right: 140.99.17.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
140.99.16.0	PTR	network.deru.net
140.99.16.1	PTR	ns1-gw.deru.net
140.99.16.2	PTR	ns1.deru.net
140.99.16.6	A	edscape.deru.com
140.99.16.17	PTR	xxxx-gw.deru.com
140.99.16.18	A	inkswitch.deru.com
140.99.16.25	A	capstone-gw.deru.com
140.99.16.26	A	capstone.deru.com
140.99.16.32	PTR	network.controlscan.deru.com
140.99.16.34	PTR	scanner.controlscan.com
140.99.16.40	PTR	network.controlscan.deru.com
140.99.16.42	PTR	scanner.controlscan.com
140.99.16.74	A	mail.burickcommunication.com
140.99.16.110	PTR	awardvacations.com
140.99.16.122	PTR	arizonasportsfans.com
140.99.16.142	A	mail.royaltemporaries.net
140.99.16.142	A	mail.thecyberpit.com
140.99.16.142	A	mail.royaltechnical.net
140.99.16.148	PTR	network.controlscan.deru.com
140.99.16.150	PTR	scanner.controlscan.com
140.99.16.154	PTR	ilmatar.deru.net
140.99.16.162	PTR	backup3.deru.net
140.99.16.170	PTR	lodesys.com
140.99.16.176	PTR	network.deru.net
140.99.16.177	PTR	ns6-gw.deru.net
140.99.16.210	A	roadconnect.deru.com
140.99.16.218	A	mx.damnetwork.net
140.99.17.64	PTR	network.ganesh.deru.net
140.99.17.66	PTR	66.ganesh.deru.net
140.99.17.74	PTR	74.ganesh.deru.net
140.99.17.76	PTR	76.ganesh.deru.net
140.99.17.77	PTR	77.ganesh.deru.net
140.99.17.80	PTR	80.ganesh.deru.net
140.99.17.81	PTR	81.ganesh.deru.net
140.99.17.86	PTR	86.ganesh.deru.net
140.99.17.87	PTR	87.ganesh.deru.net
140.99.17.89	PTR	89.ganesh.deru.net
140.99.17.90	PTR	90.ganesh.deru.net
140.99.17.92	PTR	92.ganesh.deru.net
140.99.17.96	PTR	96.ganesh.deru.net
140.99.17.101	PTR	101.ganesh.deru.net
140.99.17.113	PTR	113.ganesh.deru.net
140.99.17.114	PTR	114.ganesh.deru.net
140.99.17.117	PTR	117.ganesh.deru.net
140.99.17.120	PTR	120.ganesh.deru.net
140.99.17.121	PTR	121.ganesh.deru.net
140.99.17.122	PTR	122.ganesh.deru.net