Robtex

Up: 205.233.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 205.233.140.0/23
Down right: 205.233.142.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
205.233.140.67	A+PTR	ns.marconet.com
205.233.140.68	A+PTR	ns3.marconet.com
205.233.140.73	PTR	www.marconet.com
205.233.140.73	A	cross-pt.com
205.233.140.73	A	crosspt.com
205.233.140.78	PTR	ocsedge.marconet.com
205.233.140.78	A	screenconnect.marconet.com
205.233.140.79	A	screlay.marconet.com
205.233.140.82	PTR	ocsrp.marconet.com
205.233.140.82	A	webconnect.marconet.com
205.233.140.87	A	lyncedge.marconet.com
205.233.140.88	PTR	205.233.140.88.marconet.com
205.233.140.88	A	flexera.marconet.com
205.233.140.102	A+PTR	ltweb1.marconet.com
205.233.140.108	PTR	205.233.140.108.marconet.com
205.233.140.108	A	fmaudit.marconet.com
205.233.140.109	PTR	205.233.140.109.marconet.com
205.233.140.109	A	autodiscover.marconet.com
205.233.140.109	A	web.marconet.com
205.233.140.110	PTR	205.233.140.110.marconet.com
205.233.140.110	A	mail.marconet.com
205.233.140.112	PTR	205.233.140.112.marconet.com
205.233.140.112	A	crosspt.com
205.233.140.112	A	marcotechnologiesllc.com
205.233.140.124	A	vdi.marconet.com
205.233.140.131	PTR	mail.marcomail.com
205.233.140.131	A	c21firstrealty.net
205.233.140.131	A	mail.pleasurelandrv.com
205.233.140.138	A	giftnetworks.com
205.233.140.140	PTR	noc2.marconet.com
205.233.140.140	A	hosting.marconet.com
205.233.140.140	A	discreet-care.com
205.233.140.156	PTR	205.233.140.156.marconet.com
205.233.140.156	A	spectrum-metal.com
205.233.140.156	A	marcosafe.com
205.233.140.167	PTR	205.233.140.167.marconet.com
205.233.140.167	A	acc.marconet.com
205.233.140.190	A	kaseya.marconet.com
205.233.140.192	A+PTR	mail.marconet.com
205.233.141.23	PTR	205.233.141.23.marconet.com
205.233.141.48	A	stearnsstratumviewer.com
205.233.141.49	A	stearnsplm.com
205.233.142.67	A+PTR	ns2.marconet.com