Robtex

Up: 168.137.96.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 168.137.100.0/23
Down right: 168.137.102.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
168.137.100.12	A+PTR	tpmailinfoqa.hrblock.com
168.137.100.13	A+PTR	zcsproxy.hrblock.com
168.137.100.14	A	myvpn.hrblock.com
168.137.100.15	A+PTR	ra1.hrblock.com
168.137.100.16	A+PTR	ra2.hrblock.com
168.137.100.17	A+PTR	ra3.hrblock.com
168.137.100.19	A+PTR	edmweb.hrblock.com
168.137.100.20	A+PTR	view.hrblock.com
168.137.100.21	A+PTR	hrbc.hrblock.com
168.137.100.30	A+PTR	sftp.hrblock.com
168.137.100.31	A+PTR	devdoc.taxcut.com
168.137.100.34	A+PTR	island.taxcut.com
168.137.100.35	A+PTR	sqatrans.hrblock.net
168.137.100.36	A+PTR	sfintest.hrblock.net
168.137.100.38	A+PTR	prdfinweb.hrblock.com
168.137.100.39	A+PTR	prdimrweb.hrblock.com
168.137.100.40	A	retailapps.hrblock.com
168.137.100.41	A+PTR	webcdb.hrblock.com
168.137.100.42	A+PTR	taxrouting.hrblock.com
168.137.100.43	A+PTR	clarifyweb.hrblock.com
168.137.100.46	A+PTR	connect.hrblock.com
168.137.100.50	A+PTR	traininglivepro.hrblock.com
168.137.100.52	PTR	ns3.hrblock.com
168.137.100.53	PTR	ns4.hrblock.com
168.137.100.68	A+PTR	thegreenroomstaging.hrblock.com
168.137.100.69	A	thegreenroomqa.hrblock.com
168.137.100.70	A+PTR	lnpforms.hrblock.com
168.137.100.72	A+PTR	gomoneyexpress.com
168.137.100.73	A+PTR	clarifyweb-qa.hrblock.net
168.137.100.81	A+PTR	mrbprd2.hrblock.com
168.137.100.82	A	email.tax.hrblock.com
168.137.100.86	A+PTR	qalivepts.hrblock.net
168.137.100.87	A+PTR	qaliveservices.hrblock.net
168.137.100.89	A	traininglivepts.hrblock.com
168.137.100.90	A	trainingliveservices.hrblock.com
168.137.100.92	A+PTR	odds.hrblock.com
168.137.100.93	A+PTR	fedsso.hrblock.com
168.137.100.96	A+PTR	tstscoweb01.hrblock.net
168.137.100.100	A+PTR	iam12-qa.hrblock.net
168.137.100.102	PTR	roam.hrblock.com
168.137.100.103	A+PTR	webapps.hrblock.com
168.137.100.104	A+PTR	workspace.hrblock.com
168.137.100.106	A+PTR	hrbftppublic.hrblock.com
168.137.100.107	A+PTR	fintrain.hrblock.com
168.137.100.110	A+PTR	taxproadmin.hrblock.com
168.137.100.112	A+PTR	taxpro.hrblock.com
168.137.100.113	A+PTR	hrbftpprivate.hrblock.com
168.137.100.115	PTR	sts.hrblock.com
168.137.100.116	A+PTR	myblock2.hrblock.com
168.137.100.118	A+PTR	webcdbserv.hrblock.com
168.137.100.119	A+PTR	ahp.hrblock.com
168.137.100.120	A+PTR	mail13.hrblock.com
168.137.100.121	A	access.hrblock.com
168.137.100.122	A+PTR	tpmail.hrblock.com
168.137.100.124	A+PTR	blockwebtraining.com
168.137.100.125	A+PTR	mail14.hrblock.com
168.137.100.130	A+PTR	blocknet.hrblock.com
168.137.100.132	A+PTR	depot.hrblock.com
168.137.100.133	A+PTR	webmail.hrblock.com
168.137.100.136	A+PTR	iserviceprod.hrblock.com
168.137.100.137	A+PTR	iservice.hrblock.com
168.137.100.139	A+PTR	abedit.hrblock.com
168.137.100.142	A+PTR	hrbsearch.hrblock.com
168.137.100.146	A+PTR	resolve.hrblock.com
168.137.100.147	A+PTR	wheresmymoney.hrblock.com
168.137.100.148	A+PTR	esite.hrblock.com
168.137.100.148	A	epro-sw.hrblock.com
168.137.100.153	A	morfinserv.com
168.137.100.154	A	psfsqa.hrblock.net
168.137.100.162	PTR	idm.hrblock.com
168.137.100.162	A	token.hrblock.com
168.137.100.163	A+PTR	deductionpro.com
168.137.100.164	A+PTR	emeraldadvance.hrblock.com
168.137.100.165	A+PTR	mail15.hrblock.com
168.137.100.166	A+PTR	mail16.hrblock.com
168.137.100.167	A+PTR	emailbox01.hrblock.com
168.137.100.168	A+PTR	emailbox02.hrblock.com
168.137.100.171	A+PTR	am.hrblock.com
168.137.100.172	A	staging.delphistaxsolutions.com
168.137.100.173	A+PTR	delphistaxsolutions.com
168.137.100.174	A+PTR	kcutil.hrblock.com
168.137.100.174	A+PTR	officeweb.hrblock.com
168.137.100.176	A+PTR	bsltst.hrblock.net
168.137.100.178	A+PTR	besl.hrblock.com
168.137.100.180	A+PTR	amsvc.hrblock.com
168.137.100.182	A+PTR	amqasvc.hrblock.net
168.137.100.185	A	tokenkey.hrblock.com
168.137.100.191	A+PTR	hrbbacuser.hrblock.net
168.137.100.192	A+PTR	support.hrblock.com
168.137.100.192	A+PTR	supportpoc.hrblock.com
168.137.100.193	A+PTR	taxesadmin.hrblock.com
168.137.100.194	A+PTR	eclaims.hrblock.com
168.137.100.195	PTR	getitrightadmin.hrblock.com
168.137.100.195	PTR	am.training.hrblock.net
168.137.100.198	A+PTR	taxresearchcenter.thetaxinstitute.com
168.137.100.200	A+PTR	fisss.hrblock.com
168.137.100.200	A+PTR	tpfqa.hrblock.net
168.137.100.201	A+PTR	qafinweb.hrblock.net
168.137.100.201	A+PTR	tpfbf.hrblock.net
168.137.100.202	PTR	hrbtax.net
168.137.100.202	PTR	taxprofinder.hrblock.com
168.137.100.209	A+PTR	hrbssl.hrblock.com
168.137.100.210	A+PTR	hrbssl01.hrblock.com
168.137.100.211	A+PTR	hrbssl02.hrblock.com
168.137.100.212	A+PTR	hrbssr.hrblock.com
168.137.100.214	A+PTR	iam.hrblock.com
168.137.100.214	A+PTR	iamtest.hrblock.com
168.137.100.219	A+PTR	iamqa.hrblock.net
168.137.100.221	A+PTR	eaprint.hrblock.com
168.137.100.222	A+PTR	virtual.hrblock.com
168.137.100.224	A	kb.hrblock.com
168.137.100.227	A+PTR	wheresmymoneyqa.hrblock.net
168.137.100.230	A	emeraldperks.hrblock.com
168.137.100.235	PTR	tcxdemo.hrblock.net
168.137.100.240	A+PTR	mrbprd.hrblock.com
168.137.100.241	A+PTR	mrbfin.hrblock.com
168.137.100.242	A+PTR	mrbert.hrblock.com
168.137.100.245	A+PTR	amq.hrblock.com
168.137.100.246	A+PTR	cdsqa3.hrblock.com
168.137.100.247	A+PTR	oddsqa3.hrblock.com
168.137.100.248	A	keys.hrblock.com
168.137.100.250	A+PTR	psfsprd-ren.hrblock.com
168.137.100.254	A	hrbselfserv.hrblock.com
168.137.102.9	A+PTR	ebpm.hrblock.com
168.137.102.15	A	services.hrblock.com
168.137.102.16	A+PTR	apistaging.hrblock.com
168.137.102.16	A+PTR	puslstaging.hrblock.com
168.137.102.19	A+PTR	larry.hrblock.com
168.137.102.20	A+PTR	moe.hrblock.com
168.137.102.21	A+PTR	curly.hrblock.com
168.137.102.23	A+PTR	vdiqa.hrblock.com
168.137.102.29	A+PTR	tpadmin-qa.hrblock.net
168.137.102.30	A+PTR	citrixtest.hrblock.com
168.137.102.32	A+PTR	odsqa.hrblock.com
168.137.102.34	A+PTR	star-reports.hrblock.com
168.137.102.35	A	taxesdemo.hrblock.com
168.137.102.39	A+PTR	sftpqa.hrblock.com
168.137.102.40	A+PTR	pts101.hrblock.com
168.137.102.42	A+PTR	tcxdemo.hrblock.com
168.137.102.43	A+PTR	redirect.hrblock.com
168.137.102.44	A+PTR	media.hrblock.com
168.137.102.50	A+PTR	bcguest-fw.hrblock.net
168.137.102.52	A+PTR	supportfr.hrblock.com
168.137.102.53	A+PTR	supportco.hrblock.com
168.137.102.54	A+PTR	supportqa.hrblock.com
168.137.102.56	A+PTR	tcxqa.hrblock.net
168.137.102.60	A+PTR	supportoffice.hrblock.com
168.137.102.74	A+PTR	ecom-qa.hrblock.net
168.137.102.77	A+PTR	odslnp.hrblock.com
168.137.102.92	A+PTR	edge.hrblock.com
168.137.102.98	A+PTR	seg.hrblock.com
168.137.102.99	A+PTR	mag.hrblock.com
168.137.102.105	A+PTR	castqa.hrblock.net
168.137.102.110	A+PTR	arin.hrblock.com
168.137.102.111	A	fmr.hrblock.com
168.137.102.112	A+PTR	fmrtst.hrblock.com
168.137.102.114	A	mrbdevtrans.hrblock.net
168.137.102.117	A	help.hrblock.com
168.137.102.118	A+PTR	ods.hrblock.com
168.137.102.121	A+PTR	dna.hrblock.com
168.137.102.127	A+PTR	lnphrb.hrblock.net
168.137.102.127	A+PTR	iamqa-temp.hrblock.net
168.137.102.128	PTR	lnpmobile.hrblock.net
168.137.102.130	A+PTR	moffice.hrblock.com
168.137.102.131	A	ideaspark.hrblock.com
168.137.102.134	A+PTR	cast.hrblock.com
168.137.102.137	A	thegreenroom.hrblock.com
168.137.102.145	A	blockreports.hrblock.com
168.137.102.147	A+PTR	web.hrblock.com
168.137.102.149	A+PTR	myblock.com
168.137.102.149	A+PTR	myblockaccount.com
168.137.102.149	A+PTR	myhrblockaccount.com
168.137.102.151	PTR	hrbindia.com
168.137.102.151	PTR	hrblock.in
168.137.102.151	PTR	hrblock.co.in
168.137.102.152	A+PTR	atssvc.hrblock.com
168.137.102.154	A+PTR	myaccountqa.hrblock.net
168.137.102.158	A	psfsprd.hrblock.com
168.137.102.162	A	pshprd-ssl.hrblock.com
168.137.102.164	A+PTR	lnpmyaccount.hrblock.net
168.137.102.165	A+PTR	lnpidp.hrblock.com
168.137.102.166	A+PTR	lnpmyaccount2.hrblock.net
168.137.102.174	A+PTR	trs.hrblock.com
168.137.102.176	A+PTR	rcscs-a.hrblock.com
168.137.102.177	A	login.tcxdemo.hrblock.net
168.137.102.197	A+PTR	tpadmin.es.hrblock.com
168.137.102.202	A	roam.hrblock.com
168.137.102.207	A+PTR	bo.hrblock.com
168.137.102.208	A+PTR	atlasqa.hrblock.com
168.137.102.213	PTR	myblock.hrblock.com
168.137.102.213	A+PTR	myblockportal.hrblock.com
168.137.102.221	A+PTR	vdi.hrblock.com
168.137.102.224	A+PTR	devintidp.hrblock.net
168.137.102.225	A+PTR	devintsp.hrblock.net
168.137.102.235	A	hrbcomqa.hrblock.net
168.137.102.239	A+PTR	odsqastg.hrblock.net
168.137.102.240	A	ns3.hrblock.com
168.137.102.241	A+PTR	lca.hrblock.com
168.137.102.243	A+PTR	atlas.hrblock.com
168.137.103.11	A+PTR	myblockqa.hrblock.net
168.137.103.12	A+PTR	amqa.hrblock.net
168.137.103.15	A+PTR	tstmefapp04.hrblock.net
168.137.103.16	A+PTR	tstmefapp05.hrblock.net
168.137.103.17	A+PTR	tstmefapp08.hrblock.net
168.137.103.24	A+PTR	lucky.hrblock.com
168.137.103.25	A+PTR	dusty.hrblock.com
168.137.103.26	A+PTR	ned.hrblock.com
168.137.103.27	A+PTR	clientservices.hrblock.com
168.137.103.36	A+PTR	supportprd.hrblock.com
168.137.103.38	A+PTR	eis.hrblock.com
168.137.103.40	A+PTR	edmwebcap.hrblock.com
168.137.103.42	A+PTR	taxidshield.hrblock.com
168.137.103.52	PTR	ecom.es.hrblock.com
168.137.103.180	A+PTR	apigw.hrblock.com
168.137.103.241	A+PTR	ns5.hrblock.com
168.137.103.241	A+PTR	hixtest.hrblock.com