Robtex

Up: 66.45.56.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 66.45.56.0/24
Down right: 66.45.57.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.45.56.12	A	mail.apogeephysicians.net
66.45.56.64	A	repros.net
66.45.56.66	A	pop3.re-pros.com
66.45.56.67	A+PTR	smtp.re-pros.com
66.45.56.96	A	ns1.searchcentrix.com
66.45.56.97	A	ns2.searchcentrix.com
66.45.56.106	A	secure.adtrgt.com
66.45.56.109	A	113693url.displayadfeed.com
66.45.56.118	A+PTR	mail.adonnetwork.com
66.45.56.118	A	mail.mygeek.com
66.45.56.118	A	mail00.mygeek.com
66.45.56.124	A	search.quickeasysearch.com
66.45.56.124	A	113594url.cpvtgt.com
66.45.56.124	A	redirect.ad-feeds.com
66.45.56.137	PTR	ns3.presencemobile.net
66.45.56.137	A	bureaumobile.mobi
66.45.56.138	A	mail.ifmodule.com
66.45.57.64	A	sales.blueboxinternet.com
66.45.57.64	A	mail.sales.blueboxinternet.com
66.45.57.88	PTR	mail2.xetek.com
66.45.57.96	PTR	mail.squawkvfr.net
66.45.57.110	PTR	mail.squawkvfr.net
66.45.57.121	PTR	smtp.atomlighting.com
66.45.57.182	A	phxpay.com
66.45.57.199	A	davismedicaltranscription.com
66.45.57.202	A	besttranscriptionmtai.com
66.45.57.204	A	doctorschoicemt.com
66.45.57.205	A	digitalscript.biz
66.45.57.240	A	mail.campingcompanies.net
66.45.57.242	PTR	mail.re-pros.net
66.45.57.242	A	mail.vendorcomply.com
66.45.57.242	A	mail.afterhoursrecovery.com