Robtex

Up: 66.196.232.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.196.236.0/23
Down right: 66.196.238.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.196.236.2	A	router.admiralservices.com
66.196.236.126	A	mail.incontroltech.com
66.196.236.138	PTR	mail.kwoklaw.com
66.196.236.177	A+PTR	mail.jdmartin.com
66.196.236.177	A	vynckier.com
66.196.236.177	A	soltection.com
66.196.236.178	A	vpn.jdmartin.com
66.196.237.42	A	vpn.ballardlawfirm.com
66.196.237.42	A	mail2.ballardlawfirm.com
66.196.237.42	A	mail2.ballardlittlefield.com
66.196.237.99	PTR	mail.bergeroncpa.com
66.196.237.122	A	mail2.mistaway.com
66.196.237.132	PTR	smtp.geomi.com
66.196.237.132	A	r2rmx.r2rtechnologies.com
66.196.237.135	A	mailmx.geomi.biz
66.196.237.148	A	mail.industrialpolymers.com
66.196.237.163	A	mail.mailatabs.com
66.196.237.163	A	mail.abs-insurance.com
66.196.237.214	A	mail.nearterm.com
66.196.237.218	A	mail.wgwarchitects.com
66.196.238.54	A	mail2.holtyoung.com
66.196.238.54	A	mail.holtyoung.com
66.196.238.75	A	gopremiumdirect.com
66.196.238.83	PTR	pricegregory.com
66.196.238.83	PTR	exchange.gregorycook.com
66.196.238.138	A	webmail.srresources.com
66.196.238.163	A	loopback.floodkallusyen.com
66.196.238.164	PTR	smtp0.houstonexecutiveairport.com
66.196.238.236	PTR	smtp.victoryinhouston.org
66.196.238.236	A	victoryonline.net
66.196.239.37	A	polartracinc.com
66.196.239.37	A	mail.polartracinc.com
66.196.239.50	PTR	mail.freemantriallaw.com
66.196.239.67	PTR	ns1.cadcom.net
66.196.239.68	PTR	ns2.cadcom.net
66.196.239.92	A	igcvidl.com
66.196.239.146	A	mail.ebbllp.com
66.196.239.178	A	mail.iqproducts.com
66.196.239.250	PTR	hlb-cpa.com