Robtex

Up: 208.53.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.53.32.0/23
Down right: 208.53.34.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.53.32.0	PTR	208-53-32-0.c7dc.com
208.53.32.19	PTR	208-53-32-19.c7dc.com
208.53.32.19	A	enews.com
208.53.32.19	A	barnesandnoble.enews.com
208.53.32.50	PTR	208-53-32-50.c7dc.com
208.53.32.50	A	portal.barnesandnoble.com
208.53.32.58	A	store-locator.barnesandnoble.com
208.53.32.59	A	smtput.barnesandnoble.com
208.53.32.62	PTR	208-53-32-62.c7dc.com
208.53.32.65	PTR	208-53-32-65.c7dc.com
208.53.32.65	A	nookaudiobooks.com
208.53.32.77	PTR	208-53-32-77.c7dc.com
208.53.32.78	PTR	208-53-32-78.c7dc.com
208.53.32.79	PTR	208-53-32-79.c7dc.com
208.53.32.79	A	bwbxcsrelay01.barnesandnoble.com
208.53.32.121	PTR	208-53-32-121.c7dc.com
208.53.32.121	A	borders.com
208.53.32.126	PTR	208-53-32-126.c7dc.com
208.53.32.126	A	books.com
208.53.32.179	PTR	208-53-32-179.c7dc.com
208.53.32.179	A	time.barnesandnoble.com
208.53.32.180	PTR	208-53-32-180.c7dc.com
208.53.32.180	A	time.barnesandnoble.com
208.53.32.201	PTR	208-53-32-201.c7dc.com
208.53.32.204	PTR	208-53-32-204.c7dc.com
208.53.32.214	A	mail.ameridial.com
208.53.32.217	A	webserver.ameridial.com
208.53.33.27	PTR	208-53-33-27.c7dc.com
208.53.33.27	A	fictionwise.com
208.53.33.27	A	ereader.com
208.53.33.41	A	books.barnesandnoble.com
208.53.33.50	PTR	208-53-33-50.c7dc.com
208.53.33.50	A	exchangestreet.com
208.53.33.51	PTR	208-53-33-51.c7dc.com
208.53.33.51	A	www.directnetsystems.com
208.53.33.118	PTR	208-53-33-118.c7dc.com
208.53.33.118	A	nookbooks.com
208.53.33.118	A	locatethebook.com
208.53.33.255	PTR	208-53-33-255.c7dc.com
208.53.34.5	A+PTR	ns2.dattobackup.com
208.53.34.5	A	ns2.datto.biz
208.53.34.7	A+PTR	media.dattobackup.com
208.53.34.14	A	continuum-dss.dattobackup.com
208.53.34.95	A+PTR	server714.dattobackup.com
208.53.34.188	A	mail-relay.dattobackup.com
208.53.35.10	A	cloudstaging.storagecraft.com
208.53.35.22	PTR	node5.cloudservices.storagecraft.com
208.53.35.22	A	ravizza.us
208.53.35.54	A	adwordsstepbystep.com