Robtex

Up: 68.16.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 68.16.16.0/23
Down right: 68.16.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
68.16.18.1	A	tombigbeeapi.orbitmobiles.com
68.16.18.5	PTR	sonicwall.csa1.com
68.16.18.9	A	ns2.csa1.com
68.16.18.9	A	ns1.csa1.com
68.16.18.10	PTR	inet1.csa1.com
68.16.18.10	PTR	webmail.csa1.com
68.16.18.10	A	inet9.csamail.com
68.16.18.18	PTR	ftp.clevelandutilities.com
68.16.18.18	A	rockwoodelectric.org
68.16.18.20	A	obp.csa1.com
68.16.18.21	A	centralepa.org
68.16.18.26	PTR	budutil.com
68.16.18.26	A	brownsvilleenergy.com
68.16.18.26	A	brownsvilleenergyauthority.com
68.16.18.37	A	plateauelectric.com
68.16.18.50	A+PTR	techboard.csa1.com
68.16.18.52	A+PTR	orbit.csa1.com
68.16.18.59	A	tech.csa1.com
68.16.18.70	PTR	online.csa1.com
68.16.18.70	A	obv.csa1.com
68.16.18.79	A+PTR	ifms.csa1.com
68.16.18.83	A	obp.csa1.com
68.16.18.85	A	online.csa1.com
68.16.18.88	A	www.tvec.com
68.16.18.88	A	tvec.com
68.16.18.99	A+PTR	domino.csa1.com
68.16.18.99	A+PTR	ns.csa1.com
68.16.18.99	PTR	ns1.csa1.com
68.16.18.189	PTR	inet7.csa1.com
68.16.18.189	A	tcepa.com
68.16.18.189	A	lexingtonelectric.com
68.16.18.221	PTR	bolivarelectric.com
68.16.18.221	PTR	budutil.com
68.16.18.221	PTR	centralepa.com
68.16.18.238	A	inet6.csa1.com
68.16.18.252	PTR	wcmes.com
68.16.18.252	A+PTR	baracuda.csa1.com
68.16.19.170	A	mail.tccomputers.us
68.16.19.175	A	tommydegraw.com