Robtex

Up: 64.112.192.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 64.112.192.0/25
Down right: 64.112.192.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.112.192.1	A	wolverine.tc3net.com
64.112.192.3	A+PTR	mx2.tc3net.com
64.112.192.3	A	user.tc3net.com
64.112.192.3	A	linux2.tc3net.com
64.112.192.4	A	mon.tc3net.com
64.112.192.6	A+PTR	secure.tc3net.com
64.112.192.6	A	hpserver1.tc3net.com
64.112.192.6	A	mail.leanmetrics.com
64.112.192.7	A+PTR	tc3acct.tc3net.com
64.112.192.8	A+PTR	mx1.tc3net.com
64.112.192.8	A	hpserver2.tc3net.com
64.112.192.10	A+PTR	accounts.tc3net.com
64.112.192.12	PTR	mailfoundry.tc3net.com
64.112.192.13	A+PTR	mailfoundry2.tc3net.com
64.112.192.16	PTR	webserver1.tc3net.com
64.112.192.16	A	wdl.net
64.112.192.16	A	wwnet.com
64.112.192.17	A	mail4.tc3net.com
64.112.192.18	A+PTR	dns3.tc3net.com
64.112.192.18	A	hosting2.tc3net.com
64.112.192.19	A+PTR	dns4.tc3net.com
64.112.192.20	PTR	hosting2.tc3net.com
64.112.192.20	A	mail.naaf.com
64.112.192.20	A	heatorinsurance.com
64.112.192.21	A+PTR	mx5.tc3net.com
64.112.192.22	A+PTR	mail2.tc3net.com
64.112.192.24	A	mx8.tc3net.com
64.112.192.25	A	mx9.tc3net.com
64.112.192.27	A	mx10.tc3net.com
64.112.192.28	A	mx11.tc3net.com
64.112.192.32	A+PTR	nfs.tc3net.com
64.112.192.32	A	mail.tc3net.com
64.112.192.34	A+PTR	redhat.tc3net.com
64.112.192.35	A	mysql.tc3net.com
64.112.192.36	A	mx12.tc3net.com
64.112.192.37	A	phone.tc3net.com
64.112.192.38	A	mx14.tc3net.com
64.112.192.39	A	fmserver.tc3net.com
64.112.192.40	A	mx16.tc3net.com
64.112.192.40	A	modems.tc3net.com
64.112.192.41	A	mx17.tc3net.com
64.112.192.42	A	autotask.tc3net.com
64.112.192.59	A	59-192-112-64.slan.tc3net.com
64.112.192.65	A	rgateway.tc3net.com
64.112.192.66	A	altswitch-1.tc3net.com
64.112.192.67	A	altswitch-2.tc3net.com
64.112.192.68	A+PTR	gateway-1.tc3net.com
64.112.192.69	A	gateway-2.tc3net.com
64.112.192.72	A	tnt-1.tc3net.com
64.112.192.78	A	78-192-112-64.dlan.tc3net.com
64.112.192.79	A	tnt-2.tc3net.com
64.112.192.85	A	85-192-112-64.dlan.tc3net.com
64.112.192.87	A	87-192-112-64.dlan.tc3net.com
64.112.192.88	A	88-192-112-64.dlan.tc3net.com
64.112.192.100	A	100-192-112-64.vslan.tc3net.com
64.112.192.103	A	103-192-112-64.vslan.tc3net.com
64.112.192.107	A	107-192-112-64.vslan.tc3net.com
64.112.192.134	PTR	134-192-112-64.akamai.tc3net.com
64.112.192.134	A	134-192-112-64.vpn.tc3net.com
64.112.192.141	A	141-192-112-64.vpn.tc3net.com
64.112.192.142	A	142-192-112-64.vpn.tc3net.com
64.112.192.143	A	143-192-112-64.vpn.tc3net.com
64.112.192.146	A	146-192-112-64.vpn.tc3net.com
64.112.192.161	A+PTR	ciscoatt-image1.tc3net.com
64.112.192.161	A	vpn.tc3net.com
64.112.192.162	A	image1-ciscoatt.tc3net.com
64.112.192.165	A	ciscoatt-image2.tc3net.com
64.112.192.166	A	image2-ciscoatt.tc3net.com
64.112.192.169	A	ciscodsl-image1.tc3net.com
64.112.192.170	A	image1-ciscodsl.tc3net.com
64.112.192.172	A	172-192-112-64.cclan.tc3net.com
64.112.192.173	A	ciscodsl-image2.tc3net.com
64.112.192.174	A	image2-ciscodsl.tc3net.com
64.112.192.177	A+PTR	177-192-112-64.cclan.tc3net.com
64.112.192.189	A	189-192-112-64.cclan.tc3net.com
64.112.192.204	A	204-192-112-64.olan.tc3net.com
64.112.192.209	A	209-192-112-64.olan.tc3net.com
64.112.192.215	A+PTR	filemaker.tc3net.com
64.112.192.216	PTR	zimbra.tc3net.com
64.112.192.216	A	216-192-112-64.olan.tc3net.com
64.112.192.228	A	228-192-112-64.olan.tc3net.com
64.112.192.229	A+PTR	229-192-112-64.olan.tc3net.com
64.112.192.230	A	*.sedco-prv.com
64.112.192.233	A	233-192-112-64.olan.tc3net.com
64.112.192.247	A	247-192-112-64.olan.tc3net.com
64.112.192.250	A	250-192-112-64.olan.tc3net.com
64.112.192.252	A	252-192-112-64.olan.tc3net.com