Robtex

Up: 192.246.40.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.246.40.0/25
Down right: 192.246.40.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.246.40.10	A	router.idsoftware.com
192.246.40.19	PTR	www.iddevnet.com
192.246.40.28	A+PTR	q4master.idsoftware.com
192.246.40.32	PTR	kak.idsoftware.com
192.246.40.34	PTR	predator.idsoftware.com
192.246.40.35	A+PTR	quakelive.idsoftware.com
192.246.40.35	PTR	qztest.idsoftware.com
192.246.40.35	PTR	xmpp.idsoftware.com
192.246.40.36	PTR	doppleganger2.idsoftware.com
192.246.40.37	A	satan.idsoftware.com
192.246.40.37	A	rage-anarchy.com
192.246.40.37	A	rageanarchy.com
192.246.40.42	A+PTR	eden.idsoftware.com
192.246.40.42	A+PTR	evolver.idsoftware.com
192.246.40.42	A+PTR	evolver.eden.idsoftware.com
192.246.40.45	A	webfiles.idsoftware.com
192.246.40.47	PTR	qls2.idsoftware.com
192.246.40.47	A	quakerpg.org
192.246.40.47	A	idmobile.com
192.246.40.53	A+PTR	doomrpg.idsoftware.com
192.246.40.53	A	www.doomrpg.com
192.246.40.53	A	doomrpg.com
192.246.40.54	PTR	tv1.idsoftware.com
192.246.40.55	PTR	tv2.idsoftware.com
192.246.40.56	A+PTR	monster.idsoftware.com
192.246.40.56	A	update.quake3arena.com
192.246.40.58	PTR	www.orcsandelves.com
192.246.40.58	A	orcsandelves.org
192.246.40.58	A	orcsandelves.net
192.246.40.60	A+PTR	etmaster.idsoftware.com
192.246.40.62	A+PTR	pbguidauth.idsoftware.com
192.246.40.63	A	orcsandelves.com
192.246.40.65	A+PTR	wolf.idsoftware.com
192.246.40.70	A	au2rtcw2.activision.com
192.246.40.76	A	widget.idsoftware.com
192.246.40.77	PTR	ua-corp.com
192.246.40.78	PTR	www.ua-corp.com
192.246.40.96	A	etqwupdate.idsoftware.com
192.246.40.97	A	mail.idsoftware.com
192.246.40.98	PTR	barracuda.idsoftware.com
192.246.40.99	A+PTR	sslvpn.idsoftware.com
192.246.40.100	PTR	dhcp-100.idsoftware.com
192.246.40.102	PTR	dhcp-102.idsoftware.com
192.246.40.104	PTR	dhcp-104.idsoftware.com
192.246.40.105	PTR	dhcp-105.idsoftware.com
192.246.40.108	A	etqwupdate.idsoftware.com
192.246.40.118	PTR	dhcp-118.idsoftware.com
192.246.40.122	PTR	dhcp-122.idsoftware.com
192.246.40.139	PTR	dhcp-139.idsoftware.com
192.246.40.141	PTR	dhcp-141.idsoftware.com
192.246.40.150	PTR	dhcp-150.idsoftware.com
192.246.40.159	A	q4master.idsoftware.com
192.246.40.185	A+PTR	quake3arena.com
192.246.40.185	PTR	*.doom.com
192.246.40.185	A+PTR	charon.idsoftware.com
192.246.40.190	PTR	sticky.idsoftware.com
192.246.40.203	PTR	vmware2.idsoftware.com
192.246.40.244	A+PTR	idnet.ua-corp.com