Robtex

Up: 66.22.192.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 66.22.192.0/22
Down right: 66.22.196.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.22.192.1	A	datacenter.fw1iad.centrivity.net
66.22.192.1	A	fw1iad.centrivity.net
66.22.192.2	A	data-sw1iad.centrivity.net
66.22.192.10	A	wwwprd01.centrivity.net
66.22.192.11	A+PTR	wwwprd02.centrivity.com
66.22.192.11	A	wwwprd02.centrivity.net
66.22.192.11	A	wwwprd03.centrivity.net
66.22.192.18	A	ld1iad.centrivity.net
66.22.192.21	A	cwmonitor.centrivity.net
66.22.192.22	A	bbmonitor.centrivity.net
66.22.192.23	A	statserver.centrivity.net
66.22.192.25	A	bbiad03.centrivity.net
66.22.192.26	A	mp1routiad.centrivity.net
66.22.192.27	A	mp3routiad.centrivity.net
66.22.192.28	A	devbb.centrivity.net
66.22.192.40	A+PTR	spcl-webmail-01.digiconasp.net
66.22.192.40	PTR	webmail.digiconasp.net
66.22.192.41	A	gateway.digiconasp.com
66.22.192.41	A	hdfilter.digiconasp.com
66.22.192.42	PTR	digispool.digiconasp.com
66.22.192.42	A	spcl-ve15cas-01.digiconasp.com
66.22.192.52	A	smtp2.centrivity.net
66.22.192.55	A+PTR	worc1.digicon.com
66.22.192.55	A	worc.digicon.com
66.22.192.57	A+PTR	worc2.digicon.com
66.22.192.60	A	v3prd01.centrivity.net
66.22.192.61	A	v3prd02.centrivity.net
66.22.192.66	A	ciosp2.digicon.com
66.22.192.69	A	ascendancy.net
66.22.192.69	A	looch.com
66.22.192.69	A	www.looch.com
66.22.192.78	A	iadwsus01.centrivity.net
66.22.192.98	A	iadbudget01.centrivity.net
66.22.192.150	A	qmail.centrivity.net
66.22.192.154	A	qmail02.centrivity.net
66.22.192.154	A	mail.looch.com
66.22.192.169	A	qmail-prod-02.centrivity.net
66.22.192.193	PTR	greenitsystems.net
66.22.192.193	PTR	benefits.digicon.com
66.22.192.193	PTR	bitek.digicon.com