Robtex

Up: 66.78.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.78.16.0/23
Down right: 66.78.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.78.16.0	PTR	ns1.rookdns.com
66.78.16.35	A	*.pornstarclassics.com
66.78.16.35	A	monstersofclassicrock.com
66.78.16.35	A	mail.pornstarclassics.com
66.78.16.53	PTR	ns1.rookdns.com
66.78.16.53	A	realpornplus.com
66.78.16.53	A	eddiesaintaubin.com
66.78.16.85	PTR	ns1.rookdns.com
66.78.16.107	A	internetsecrets.ca
66.78.16.110	PTR	ns1.rookdns.com
66.78.16.123	PTR	ns1.rookdns.com
66.78.17.43	PTR	ns1.rookdns.com
66.78.17.91	PTR	ns1.rookdns.com
66.78.17.100	PTR	ns1.rookdns.com
66.78.17.101	PTR	ns1.rookdns.com
66.78.17.180	A	main.wickedpictures.com
66.78.17.254	PTR	ns1.rookdns.com
66.78.17.255	PTR	ns1.rookdns.com
66.78.18.0	PTR	ns1.rookdns.com
66.78.18.28	PTR	ns1.rookdns.com
66.78.18.63	A	thetalentpool.ca
66.78.18.140	PTR	ns1.rookdns.com
66.78.18.243	PTR	ns1.rookdns.com
66.78.19.50	PTR	sales1370-alvarez-tax-service.snailpad.com
66.78.19.50	A	mail.maybe18.com
66.78.19.50	A	mail.majorquake.com
66.78.19.165	PTR	sales144-alvarez-tax-service.featuredgab.com
66.78.19.176	PTR	ns1.rookdns.com
66.78.19.255	PTR	ns1.rookdns.com