Robtex

Up: 66.186.96.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 66.186.112.0/21
Down right: 66.186.120.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.186.113.15	A+PTR	vpn.idg.com
66.186.113.15	PTR	vpneast.idg.com
66.186.113.66	A	cag.idg.com
66.186.113.100	A	ftp.idg.com
66.186.113.124	A	usmaedg01.idg.com
66.186.113.125	A	usmaedg02.idg.com
66.186.113.126	A+PTR	hybrid.idg.com
66.186.113.126	PTR	webmail.idg.com
66.186.113.127	A	usmarly01.idg.com
66.186.113.130	A	access.idg.com
66.186.113.163	A	idgcsgwsus.idg.com
66.186.113.171	A	docs.idg.com
66.186.114.18	A+PTR	cwfeventsweb.computerworld.com
66.186.114.18	A	snworlando.com
66.186.114.18	A	greenitsymposium.com
66.186.114.169	A+PTR	cwonline.computerworld.com
66.186.114.172	A+PTR	cwresources.computerworld.com
66.186.114.241	A	mail.ipsidg.com
66.186.114.246	A	www.idgcentral.com
66.186.114.246	A	idgcentral.com
66.186.114.249	A	idgns.com
66.186.116.10	A+PTR	wecmail.idgworldexpo.com
66.186.116.28	A+PTR	mailer.idgconnect.com
66.186.116.28	A+PTR	online.idgconnect.com
66.186.116.29	A	mailer.idgcentral.com
66.186.116.64	A	makecontentwork.com
66.186.116.64	A	www.makecontentwork.com
66.186.116.64	A	makeconversionwork.com
66.186.116.80	A+PTR	cio.cxo-media.net
66.186.116.81	A+PTR	circulation.cxo-media.net
66.186.116.82	A+PTR	cso.cxo-media.net
66.186.116.83	A+PTR	cxo.cxo-media.net
66.186.116.100	A	cosmos.cxo.com
66.186.116.102	A	orders.cxo.com
66.186.116.104	A+PTR	ci.cxo.com
66.186.116.104	A+PTR	galaxy.cxo.com
66.186.116.106	PTR	helpdesk.cxo.com
66.186.116.106	PTR	public.cxo.com
66.186.116.116	A	ifwsmtp.infoworld.com
66.186.116.140	A	mail.idglist.com
66.186.116.161	A+PTR	events.networkworld.info
66.186.116.162	A+PTR	subscription.networkworld.info
66.186.116.163	A	online.networkworld.info
66.186.116.167	A	server.nww.com
66.186.116.180	A+PTR	files.idgcomm.com
66.186.116.180	A+PTR	public.idgcomm.com
66.186.116.181	A	cosmos.idgcomm.com
66.186.116.182	A	orders.idgcomm.com
66.186.116.192	A	atgftp.idgcomm.com
66.186.122.13	A	csgns2.idg.com
66.186.122.128	A	changeme.idg.com
66.186.125.135	A	resources.computerworldon.com
66.186.125.136	A	resources.computerworldon.com
66.186.125.143	A	resources.networkworldonline.com
66.186.125.144	A	resources.networkworldonline.com
66.186.125.175	A	resources.oninfoworld.com
66.186.125.176	A	resources.oninfoworld.com
66.186.126.5	A	ns1.insideidc.com
66.186.127.32	A+PTR	online2.idgconnect.com
66.186.127.32	PTR	www.online2.idgconnect.com
66.186.127.66	A+PTR	online.itwhitepapers.com
66.186.127.67	A+PTR	online.itwhitepapers.com
66.186.127.68	A	lm.pcworld.com
66.186.127.69	A	lm.pcworld.com
66.186.127.70	A	newsletters.macworld.com
66.186.127.71	A	newsletters.macworld.com
66.186.127.72	A	lm.macworld.com
66.186.127.73	A	lm.macworld.com
66.186.127.85	A	online.idgglobalsolutions.com
66.186.127.86	A	online.idgresearch.com
66.186.127.89	A+PTR	nl.pcworld.com
66.186.127.90	A+PTR	nl.pcworld.com
66.186.127.92	A	optouts.cio.com
66.186.127.189	A+PTR	online.networkworld.com
66.186.127.189	A	nwwlyris.idgcomm.com
66.186.127.190	A+PTR	online.networkworld.com
66.186.127.190	A	nwwlyris.idgcomm.com
66.186.127.191	A+PTR	online.networkworld.com
66.186.127.191	A	nwwlyris.idgcomm.com
66.186.127.206	A+PTR	focus.computerworld.com
66.186.127.207	A+PTR	online.itwhitepapers.com
66.186.127.207	A	online.technologybriefcase.com
66.186.127.208	A	online.itnews.com
66.186.127.209	A	online.itnews.com
66.186.127.214	A	online.idg.tv
66.186.127.214	A	mailhandler1.online.idg.tv
66.186.127.215	A	online.idg.tv
66.186.127.215	A	mailhandler2.online.idg.tv
66.186.127.224	A+PTR	cwresources.computerworld.com
66.186.127.225	A+PTR	cwonline.computerworld.com
66.186.127.226	A+PTR	cxolyris.cxomedia.com
66.186.127.227	A+PTR	online.itwhitepapers.com
66.186.127.227	A	online.technologybriefcase.com
66.186.127.250	A+PTR	spamassassin.idgcomm.com
66.186.127.251	A+PTR	spamassassin2.idgcomm.com
66.186.127.252	A+PTR	spamassassin2.idgcomm.com
66.186.127.253	A+PTR	spamassassin.idgcomm.com
66.186.127.254	A	cxolyris.cxomedia.com
66.186.127.254	A	online.cxomedia.com