Robtex

Up: 66.43.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.43.20.0/23
Down right: 66.43.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.43.20.12	A+PTR	ns.rootsweb.com
66.43.20.12	A+PTR	ns1.myfamily.net
66.43.20.12	A+PTR	d1ddi01.myfamilysouth.com
66.43.20.32	A+PTR	interactive.ancestry.com
66.43.20.32	A	interactive.ancestry.co.uk
66.43.20.32	A	interactive.ancestry.ca
66.43.20.46	PTR	facebook.ancestry.com
66.43.20.52	A+PTR	smaprimo.ancestry.com
66.43.20.55	A	siteservices.ancestry.com
66.43.20.63	A+PTR	placepfx.ancestry.com
66.43.20.67	A+PTR	ajax.ancestry.ca
66.43.20.67	A	guidance.ajax.ancestry.ca
66.43.20.67	A	banner.ajax.ancestry.ca
66.43.20.68	A+PTR	ajax.ancestry.co.uk
66.43.20.68	A	fbsso.ajax.ancestry.co.uk
66.43.20.68	A	hintsparts.ajax.ancestry.co.uk
66.43.20.69	PTR	ajax.ancestry.com.au
66.43.20.120	PTR	search.ancestrystage.com
66.43.20.120	PTR	search.msn.ancestrystage.com
66.43.20.120	A+PTR	legos.ancestry.com
66.43.20.123	PTR	content.ancestrystage.com
66.43.20.123	PTR	content.msn.ancestrystage.com
66.43.20.123	A	collections.ancestry.com
66.43.20.169	A+PTR	wiz.ancestry.com
66.43.20.179	A	www.smgf.org
66.43.20.179	A	smgf.com
66.43.20.179	A	smgf.org
66.43.20.183	A+PTR	cdn.mundia.com
66.43.20.183	A	muncn.com
66.43.20.184	A	mundiatranslate.com
66.43.20.185	A	muncntranslate.com
66.43.20.188	A	mundianameracetranslate.com
66.43.20.195	A+PTR	wiz2.ancestry.com
66.43.20.199	A	mundianamerace.com
66.43.20.223	A+PTR	connect.ancestry.com
66.43.20.223	A	connect.ancestry.co.uk
66.43.20.223	A	connect.ancestry.com.au
66.43.20.229	A+PTR	media.ancestry.com
66.43.20.235	PTR	progenealogists.com
66.43.20.235	A+PTR	progeneologists.com
66.43.20.235	PTR	progenealogists.ie
66.43.20.253	A+PTR	bts.ancestry.com
66.43.21.9	A+PTR	ancestryheritagequest.com
66.43.21.9	A+PTR	archives.ancestry.com
66.43.21.9	A	www.ancestryheritagequest.com
66.43.21.10	PTR	hints.ancestry.com
66.43.21.10	A	hints.ancestry.ca
66.43.21.26	A+PTR	msm.ancestry.com
66.43.21.27	PTR	mediasvc.ancestry.com
66.43.21.27	A	mediasvc.ancestrylibrary.com
66.43.21.27	A	mediasvc.ancestry.de
66.43.21.30	A	www.mycanvas.com
66.43.21.30	A	whatsinyourtree.com
66.43.21.30	A	www.familyheritage.com
66.43.21.39	A+PTR	dnashippingsmk.ancestry.com
66.43.21.49	A+PTR	mobileredirector.ancestry.com
66.43.21.49	A	dnaredirector.ancestry.com
66.43.21.50	PTR	person.ancestry.com
66.43.21.50	A	person.ancestry.ca
66.43.21.50	A	person.ancestry.co.uk
66.43.21.66	A	apv.ancestry.com
66.43.21.68	A	navigation.ancestry.com.au
66.43.21.68	A	navigation.ancestry.ca
66.43.21.68	A	navigation.ancestry.co.uk
66.43.21.74	A+PTR	mitsvc.ancestry.com
66.43.21.74	A	mitsvc.ancestry.co.uk
66.43.21.74	A	mitsvc-slc.ancestry.com
66.43.21.77	A	mediaupload.ancestry.com
66.43.21.79	A+PTR	genealogy.com
66.43.21.79	PTR	www.genealogy.com
66.43.21.79	A	www.familyorigins.com
66.43.21.81	A+PTR	d2mail.ancestry.com
66.43.21.93	A+PTR	apisecure.ancestry.com
66.43.21.113	A	search-slc.ancestry.com
66.43.21.113	A	search.ancestry.co.uk
66.43.21.113	A	sui-app.mfsbe.com
66.43.21.116	A	health.ancestry.com
66.43.21.116	A	familyhealthhistory.com
66.43.21.116	A	ancestryhealth.com
66.43.21.117	A+PTR	fel.ancestry.com
66.43.21.118	PTR	fs.ancestry.com
66.43.21.123	A+PTR	archives.com
66.43.21.123	A+PTR	www.archives.com
66.43.21.126	A+PTR	d.genealogyaffiliates.com
66.43.21.126	A+PTR	i.genealogyaffiliates.com
66.43.21.126	PTR	genealogyarchives.com
66.43.21.127	PTR	recordsbase.archives.com
66.43.21.128	A+PTR	aff.archives.com
66.43.21.129	A+PTR	partneradmin.archives.com
66.43.21.130	A+PTR	api.archives.com
66.43.21.133	A+PTR	smaprimo133.ancestry.com
66.43.21.134	A	smaprimo134.ancestry.com
66.43.21.141	A+PTR	addperson.ancestry.com
66.43.21.141	PTR	ancestry.com.ancestry.com
66.43.21.141	A	addperson.ancestry.co.uk
66.43.21.146	A	genealogy.org
66.43.21.146	A	www.genealogy.org
66.43.21.165	A+PTR	windows.ancestry.com
66.43.21.165	A+PTR	ftm.ancestry.com
66.43.21.169	A	auth-slc.ancestry.com
66.43.21.172	A+PTR	home.rootsweb.ancestry.com
66.43.21.176	A+PTR	gate.ancestry.com
66.43.21.176	A	gateway.ancestry.com
66.43.21.176	A	gate-slc.ancestry.com
66.43.21.177	A+PTR	navigator.ancestry.com
66.43.21.177	PTR	kubernetes-fe.ancestry.com
66.43.22.1	A	userdoc.ancestry.com
66.43.22.13	A	wap.ancestry.com
66.43.22.23	A	service.familytreemaker.com
66.43.22.35	A	familygeneologyrecords.com
66.43.22.35	A	familymarriagerecords.com
66.43.22.35	A	www.familymilitaryrecords.com
66.43.22.38	PTR	ancestryaol.com
66.43.22.38	A+PTR	trees.ancestry.com
66.43.22.38	A	trees.ancestrylibrary.com
66.43.22.41	A+PTR	secure.rootsweb.ancestry.com
66.43.22.47	A+PTR	imageservice.ancestry.com
66.43.22.47	A	imageservice.ancestry.co.uk
66.43.22.49	A	ellisislandexperience.net
66.43.22.49	A	ellisislandexperience.com
66.43.22.50	PTR	ancestry.com
66.43.22.50	PTR	www.ancestry.com
66.43.22.51	A+PTR	familyhistory.com
66.43.22.51	A	www.familyhistory.com
66.43.22.52	PTR	search.ancestry.com
66.43.22.52	PTR	searchsouth.ancestry.com
66.43.22.57	A+PTR	secure.ancestry.ca
66.43.22.58	A	records.ancestry.com
66.43.22.61	A+PTR	secure.ancestry.co.uk
66.43.22.62	PTR	ancestory.com
66.43.22.62	A	dnaancestry.co.uk
66.43.22.62	A	ancestry-inc.com
66.43.22.65	A	immunix.net
66.43.22.65	A	www.immunix.net
66.43.22.65	A	searchsouth.ancestry.com
66.43.22.68	A	123familytree.com
66.43.22.71	PTR	ancestry.co.uk
66.43.22.73	PTR	trees.ancestry.com
66.43.22.78	PTR	gale.ancestry.com
66.43.22.78	PTR	www.gale.ancestry.com
66.43.22.79	A+PTR	community.ancestry.com
66.43.22.79	A	community.ancestry.com.au
66.43.22.79	A	community.ancestry.ca
66.43.22.81	A+PTR	beta.ancestry.com
66.43.22.91	A+PTR	content.ancestry.com
66.43.22.91	PTR	content.msn.ancestry.com
66.43.22.91	A	images.ancestry.com
66.43.22.92	A	api.ancestry.com
66.43.22.92	A	api-slc.ancestry.com
66.43.22.96	A	mycanvespro.de
66.43.22.96	A	mycanvis.de
66.43.22.102	A+PTR	sm.ancestry.com
66.43.22.120	A	o.mfcreative.com
66.43.22.135	PTR	findagrave.com
66.43.22.135	PTR	forums.findagrave.com
66.43.22.135	PTR	image1.findagrave.com
66.43.22.136	A+PTR	ancestryinstitution.com
66.43.22.136	PTR	ancestryinstitution.se
66.43.22.136	PTR	ancestryinstitution.ca
66.43.22.140	A	contextux.ancestry.com
66.43.22.148	A	expertconnect.ancestry.com
66.43.22.150	A	anclsmtp01.myfamily.com
66.43.22.151	A	anclsmtp04.myfamily.com
66.43.22.154	A	mfemailm002.myfamily.com
66.43.22.155	A	comm.myfamily.com
66.43.22.156	A	cust.myfamily.com
66.43.22.162	PTR	ajax.ancestry.com
66.43.22.162	A	ajax-slc.ancestry.com
66.43.22.162	A	fbsso.ajax.ancestry.com
66.43.22.167	A	mail.mundia.com
66.43.22.170	A+PTR	tryancestry.ca
66.43.22.170	PTR	ancestryu.com
66.43.22.170	PTR	wererelated.com
66.43.22.183	PTR	ancestry.ie
66.43.22.183	PTR	findmystory.com
66.43.22.183	PTR	*.myfamilyinhistory.net
66.43.22.191	A	anclsmtp02.myfamily.com
66.43.22.192	A	anclsmtp03.myfamily.com
66.43.22.223	A	dnaancestry.com
66.43.22.243	A+PTR	galetest.ancestrystage.com
66.43.23.4	PTR	ancestrydna.ca
66.43.23.4	A+PTR	ancestrydna.com
66.43.23.4	PTR	ancestrydna.de
66.43.23.5	PTR	boards.ancestry.com
66.43.23.10	PTR	mta.myfamily.com
66.43.23.46	A+PTR	home.ancestry.com
66.43.23.46	A	home.ancestry.co.uk
66.43.23.46	A	home.ancestry.ca
66.43.23.55	A	adadmin01.ancestry.com
66.43.23.57	A+PTR	service.ancestry.com
66.43.23.60	PTR	mta.myfamily.com
66.43.23.100	A	snapgenie.com
66.43.23.103	A	telcaster.com
66.43.23.116	A	secure.ancestry.com
66.43.23.191	A	smaprimoupdate.ancestry.com
66.43.23.192	A	sm.archives.com
66.43.23.193	A	smac.archives.com
66.43.23.194	A	smin.archives.com
66.43.23.199	A+PTR	ipns.ancestry.com
66.43.23.199	A	ipns.ancestry.ca
66.43.23.199	A	ipns.ancestry.com.au
66.43.23.200	A+PTR	mv.ancestry.com
66.43.23.200	A	mv.ancestry.co.uk