Robtex

Up: 66.43.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.43.28.0/23
Down right: 66.43.30.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.43.28.20	PTR	familytreemaker.com
66.43.28.20	PTR	genealogy.com
66.43.28.21	A	ftm.genealogy.com
66.43.28.32	PTR	genforum.com
66.43.28.32	PTR	www.genforum.com
66.43.28.33	A	www.palladium.net
66.43.28.33	A	ultimatefamilytree.com
66.43.28.95	A+PTR	albatross.genealogy.com
66.43.28.97	A	lyris.genealogy.com
66.43.28.121	A+PTR	awt001.rootsweb.com
66.43.28.126	A	wc.rootsweb.com
66.43.28.126	A	wc.rootsweb.ancestry.com
66.43.28.127	A	awt007.rootsweb.com
66.43.28.128	A+PTR	oldblogs.ancestry.com
66.43.28.128	A	blogs.ancestry.com
66.43.28.128	A	blogs.mycanvas.com
66.43.28.141	A	admin.rootsweb.com
66.43.28.142	A+PTR	www.rootsweb.com
66.43.28.142	A	syslog.rootsweb.com
66.43.28.142	A	canadagenweb.org
66.43.28.143	PTR	freepages.rootsweb.com
66.43.28.144	A	bigfile.rootsweb.com
66.43.28.145	A+PTR	ssdi.rootsweb.com
66.43.28.146	PTR	virts.rootsweb.com
66.43.28.146	A	wolpertconnection.rootsweb.com
66.43.28.146	A	counter.rootsweb.com
66.43.28.148	A	surhelp-bin.rootsweb.com
66.43.28.148	A	surhelp.rootsweb.com
66.43.28.149	A+PTR	pml.rootsweb.com
66.43.28.150	A	www.genealogyforum.com
66.43.28.151	PTR	helpdesk.rootsweb.com
66.43.28.152	A	mail.rootsweb.net
66.43.28.152	A	mail.rootsweb.com
66.43.28.153	A+PTR	resources.rootsweb.com
66.43.28.153	A	resources.rootsweb.ancestry.com
66.43.28.154	PTR	searches.rootsweb.com
66.43.28.155	PTR	images.rootsweb.com
66.43.28.156	A+PTR	db.rootsweb.com
66.43.28.156	A	accounts.rootsweb.com
66.43.28.156	A	userdb.rootsweb.com
66.43.28.157	PTR	lists2.rootsweb.com
66.43.28.159	PTR	lists5.rootsweb.com
66.43.28.160	PTR	archiver.rootsweb.com
66.43.28.160	A	listsearches.rootsweb.com
66.43.28.160	A	archiver.rootsweb.ancestry.com
66.43.28.162	PTR	mail2.rootsweb.com
66.43.28.163	PTR	lists9.rootsweb.com
66.43.28.170	A+PTR	ccc.rootsweb.com
66.43.28.170	PTR	ccc.rootsweb.ancestry.com
66.43.28.172	A+PTR	myaccount.rootsweb.com
66.43.29.130	A	mail.genealogyaffiliates.com
66.43.29.130	A	mail.genhomepage.com
66.43.29.130	A	mail.genealogyarchives.com
66.43.29.243	A+PTR	data.jewishgen.org
66.43.29.243	A+PTR	data2.jewishgen.org
66.43.29.243	A+PTR	images.jewishgen.org
66.43.29.246	A+PTR	barracuda.jewishgen.org
66.43.29.250	A	mail.jewishgen.org
66.43.29.251	A	lyris.jewishgen.org
66.43.29.253	A	kehilalinks.jewishgen.org
66.43.29.253	A	www.kehilalinks.jewishgen.org
66.43.29.253	A	www.shtetlinks.jewishgen.org
66.43.29.254	PTR	jewishgen.org
66.43.29.254	PTR	ftp.jewishgen.org
66.43.29.254	PTR	www.jewishgen.org
66.43.30.2	A	bigipm1.myfamily.net
66.43.30.4	A	bigipm2.myfamily.net
66.43.30.19	PTR	mta.myfamily.com
66.43.30.19	A+PTR	dnaeservices.ancestrystage.com
66.43.30.97	A	muncnstage.com
66.43.30.100	A+PTR	www.ancestrystage.com
66.43.30.109	PTR	search.ancestrystage.com
66.43.30.109	A	content.ancestrystage.com
66.43.30.114	A	ancestrystage.es
66.43.30.119	A	ancestryinstitutionstage.com
66.43.30.119	A	ancestrylibrarystage.com
66.43.30.119	A	ancestryheritagequeststage.com
66.43.30.122	A+PTR	publicwebservices.ancestrystage.com
66.43.30.122	A+PTR	ancestrypress.ancestrystage.se
66.43.30.122	PTR	publicwebservices.ancestrystage.se
66.43.30.142	PTR	ancestrystage.com
66.43.30.142	PTR	familytreemakerstage.com
66.43.30.142	PTR	ancestrystage.pl
66.43.30.145	PTR	awt.ancestry.com
66.43.30.145	PTR	awt007.rootsweb.com
66.43.30.145	A+PTR	trees.ancestrystage.com
66.43.30.147	A	c.ancestrystage.com
66.43.30.148	A	tgnstage.com
66.43.30.169	A	id.ancestrystage.com
66.43.30.188	A+PTR	www.ancestrydev.com
66.43.30.197	A+PTR	genealogydev.com
66.43.30.197	PTR	www.genealogydev.com
66.43.30.200	A+PTR	genealogystage.com
66.43.30.200	A+PTR	genealogystage.org
66.43.30.200	A+PTR	www.genealogystage.com
66.43.30.201	A	mycanvastest.com
66.43.30.230	A	qamail.myfamilyinc.com
66.43.31.58	A	pointofsale.ancestry.com
66.43.31.104	PTR	mfemailm002.myfamily.com
66.43.31.104	A	mfemailm002.myfamily.net
66.43.31.131	PTR	mta.myfamily.com