Robtex

Up: 72.233.16.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 72.233.16.0/24
Down right: 72.233.17.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.233.16.30	PTR	30.16.233.72.static.reverse.ltdomains.com
72.233.16.30	A	www2.addthis.com
72.233.16.56	A	56.16.233.72.static.reverse.ltdomains.com
72.233.16.57	A	57.16.233.72.static.reverse.ltdomains.com
72.233.16.66	A+PTR	nldallas66.123greetings.info
72.233.16.69	A+PTR	olympic118.123greetings.com
72.233.16.71	A+PTR	nldallas71.123greetings.info
72.233.16.74	A+PTR	nldallas74.123greetings.info
72.233.16.121	A+PTR	nldallas121.123greetings.info
72.233.16.130	PTR	130.16.233.72.static.reverse.ltdomains.com
72.233.16.130	A	geekdo.com
72.233.16.130	A	boardgamegeek.com
72.233.16.139	A+PTR	139.16.233.72.static.reverse.ltdomains.com
72.233.16.139	A	arkham.boardgamegeek.com
72.233.16.139	A	vintru.com
72.233.16.187	A	store.boardgamegeek.com
72.233.16.194	A+PTR	194.16.233.72.static.reverse.ltdomains.com
72.233.16.194	A	mail.geekdo.com
72.233.16.206	A+PTR	206.16.233.72.static.reverse.ltdomains.com
72.233.16.206	A	geekdo-static.com
72.233.16.206	A	files.geekdo.com
72.233.16.207	PTR	207.16.233.72.static.reverse.ltdomains.com
72.233.16.207	A	geekdo-images.com
72.233.17.27	A	27.17.233.72.static.reverse.ltdomains.com
72.233.17.34	A	34.17.233.72.static.reverse.ltdomains.com
72.233.17.65	A	65.17.233.72.static.reverse.ltdomains.com
72.233.17.97	A	97.17.233.72.static.reverse.ltdomains.com
72.233.17.103	A	103.17.233.72.static.reverse.ltdomains.com
72.233.17.118	A	118.17.233.72.static.reverse.ltdomains.com
72.233.17.167	A	167.17.233.72.static.reverse.ltdomains.com
72.233.17.173	A	173.17.233.72.static.reverse.ltdomains.com
72.233.17.208	A	208.17.233.72.static.reverse.ltdomains.com
72.233.17.233	A	233.17.233.72.static.reverse.ltdomains.com