Robtex

Up: 66.77.16.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 66.77.16.0/24
Down right: 66.77.17.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.77.16.5	A+PTR	mta-6-005.omktmail.com
66.77.16.5	PTR	mx2.vocus-bounce.com
66.77.16.5	A	mx2.vocusemail2.com
66.77.16.10	PTR	mta-6-010.vocus-bounce.com
66.77.16.10	A	mta-6-010.omktmail.com
66.77.16.11	PTR	mta-6-011.vocus-bounce.com
66.77.16.11	A	mta-6-011.omktmail.com
66.77.16.12	A	mta-6-012.omktmail.com
66.77.16.12	A	mta-6-012.vocus-bounce.com
66.77.16.13	A	mta-6-013.omktmail.com
66.77.16.14	PTR	mta-6-014.vocus-bounce.com
66.77.16.14	A	mta-6-014.omktmail.com
66.77.16.15	PTR	mta-6-015.vocus-bounce.com
66.77.16.15	A	mta-6-015.omktmail.com
66.77.16.142	PTR	mta-6-142.vocus-bounce.com
66.77.16.142	A	relay02.mobile365.com
66.77.16.180	A	inphomatch.com
66.77.16.180	A	www.inphomatch.com
66.77.16.201	A+PTR	mta-6-201.icontact.com
66.77.16.201	A	mail.qwesticm.com
66.77.16.201	A	inphoxchange.skytext.net
66.77.17.14	PTR	mail.supersup.com
66.77.17.20	A	ns4.boarddocs.com
66.77.17.23	PTR	gtm.eme.iad.qwest.net
66.77.17.23	A	ns1.boarddocs.com
66.77.17.33	A	boarddocs.com
66.77.17.33	A	www.boarddocs.com
66.77.17.34	A	mail.inhousebar.com
66.77.17.45	A	mail4.inhousebar.com
66.77.17.54	A	stns1.apus.edu
66.77.17.92	A	mail2.shah-associates.com
66.77.17.164	A	mail.sybase365.com