Robtex

Up: 199.15.254.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 199.15.255.0/25
Down right: 199.15.255.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.15.255.12	A	mail.whiteswindows.com
199.15.255.12	A	whiteswindows.com
199.15.255.12	A	birdandcompany.net
199.15.255.34	A+PTR	new.adhknox.com
199.15.255.34	A	arnettdraper.com
199.15.255.34	A	www.adhknox.com
199.15.255.35	A	mail.lmspi.com
199.15.255.43	PTR	thehamistergroup.mailshelter.com
199.15.255.43	A	mail.hamisterhospitality.com
199.15.255.44	PTR	mail1.postini-solutions.com
199.15.255.44	A	ns3.idleair.com
199.15.255.52	A+PTR	mxdemo1.mailshelter.com
199.15.255.64	A	mail2.mailshelter.com
199.15.255.64	A	mail.spamweeder.com
199.15.255.64	A	mail.webservu.com
199.15.255.66	A	foresthillheights.com
199.15.255.66	A	www.447main.com
199.15.255.66	A	www.heatherheights.com
199.15.255.72	A	mxamericanrenal.mxshelter.com
199.15.255.73	A+PTR	mxmslcpa.mxshelter.com
199.15.255.74	PTR	ftp.weareconfidential.com
199.15.255.74	A	tassonline.org
199.15.255.74	A	www.tassonline.org
199.15.255.75	A+PTR	mxcutterbuck.mxshelter.com
199.15.255.80	A	hamistergroup.com
199.15.255.80	A	www.hamistergroup.com
199.15.255.99	A	mailroute1.mailshelter.com
199.15.255.100	A	dns3.multihosts.com
199.15.255.102	A	dzdns2.wdgonline.com
199.15.255.103	A+PTR	mx1.spamweeder.com
199.15.255.103	A	mx1new.spamweeder.com
199.15.255.104	A+PTR	mx3.spamweeder.com
199.15.255.104	A	mx2new.spamweeder.com
199.15.255.105	PTR	mx1.mxbacker.com
199.15.255.108	A	dns2.webservio.net
199.15.255.110	A+PTR	mx6.spamweeder.com
199.15.255.110	A	mx6.mailshelter.com
199.15.255.111	A+PTR	mx7.spamweeder.com
199.15.255.111	A	mx7.mailshelter.com
199.15.255.112	A	portal1.mxbacker.com
199.15.255.113	PTR	node2.mxbacker.com
199.15.255.113	A	mx1.mxbacker.com
199.15.255.113	A	mx3.mxbacker.com
199.15.255.114	PTR	node3.mxbacker.com
199.15.255.114	A	mx4.mxbacker.com
199.15.255.114	A	mx2.mxbacker.com
199.15.255.115	PTR	filter1.mailshelter.com
199.15.255.115	A	mx3.mailshelter.com
199.15.255.115	A	mx1.mailshelter.com
199.15.255.116	PTR	portal1.mailshelter.com
199.15.255.116	A	mx4.mailshelter.com
199.15.255.116	A	mx4.emailcontinuity.org
199.15.255.118	PTR	filter1.mailshelter.com
199.15.255.118	A	mx4.mailshelter.com
199.15.255.118	A	mx4.emailcontinuity.org
199.15.255.122	A+PTR	gw1.mxshelter.com
199.15.255.122	A	mail2.klamplaw.com
199.15.255.122	A	gscu-spool1.nan.com
199.15.255.123	A+PTR	gw2.mxshelter.com
199.15.255.123	A	gscu-spool2.nan.com
199.15.255.123	A	mail3.klamplaw.com
199.15.255.124	A+PTR	gw3.mxshelter.com
199.15.255.124	A	gscu-spool3.nan.com
199.15.255.124	A	mail4.klamplaw.com
199.15.255.127	PTR	gw2.mxshelter.com
199.15.255.127	A	gw1.mxshelter.com
199.15.255.127	A	mail2.klamplaw.com
199.15.255.128	PTR	gw3.mxshelter.com
199.15.255.129	A	dns4.webservio.net
199.15.255.135	A+PTR	mailtassonline.mailshelter.com
199.15.255.180	A	hdkind.com
199.15.255.180	A	*.hdkind.com
199.15.255.192	PTR	vps02.dcwebhost.com
199.15.255.203	A+PTR	vps01.k9sos.com
199.15.255.203	A	mail.emailfailover.com
199.15.255.203	A	k9sos.com
199.15.255.206	A	knoxvilledatafacility.com
199.15.255.208	A	faqs.webservio.net
199.15.255.212	A+PTR	portal1.mailshelter.com
199.15.255.212	A	mx3.mailshelter.com
199.15.255.212	A	mx1.mailshelter.com
199.15.255.213	PTR	postini-migration.postini-solutions.com
199.15.255.213	A	spam-filtering.org
199.15.255.222	A+PTR	ordella.com
199.15.255.222	A	www.ordela.com
199.15.255.223	PTR	support1.dcwebhost.com
199.15.255.223	PTR	www.message-continuity.com
199.15.255.223	A	email-continuity-business.com
199.15.255.227	PTR	mxemailfailover.mxshelter.com
199.15.255.227	A	xapclsw.com
199.15.255.227	A	postini-solutions.com
199.15.255.229	PTR	anonymousftp1.knoxshops.com
199.15.255.229	A	public.visualclasssoft.com
199.15.255.230	A	www.webservu.com
199.15.255.230	A	webservu.com
199.15.255.230	A	message-routing.com
199.15.255.232	A	data-facility.com
199.15.255.232	A	exchange-continuity.com
199.15.255.232	A	octogonhomes.com
199.15.255.235	PTR	www.ymcaknoxville.org
199.15.255.235	A	mxbacker.com
199.15.255.236	A	mx236.mailshelter.com
199.15.255.239	A+PTR	mx239.mxshelter.com
199.15.255.243	PTR	mxcancerresearch.mailshelter.com
199.15.255.243	A	mx243.mailshelter.com