Robtex

Up: 66.64.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.64.40.0/23
Down right: 66.64.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.64.40.26	A+PTR	mail.wlslighting.com
66.64.40.34	A	merc-server.com
66.64.40.42	A+PTR	dns1.logicallink.com
66.64.40.42	A	dns1.itnetworks.net
66.64.40.45	A+PTR	mail.logicallink.com
66.64.40.45	A	mail.itnetworks.net
66.64.40.82	A	texaslegaladvice.net
66.64.40.146	A	remote.fhmbk.com
66.64.40.146	A	mail.fhmbk.com
66.64.40.218	A	mail.emergentcontech.com
66.64.40.250	A	mail.littletykechildcare.com
66.64.41.10	A	mail.veradorpm.com
66.64.41.30	A+PTR	mail.lngctrust.com
66.64.41.30	A	lngctrust.com
66.64.41.66	A	mail.tbsnet.com
66.64.41.123	A	exchange.trekresources.com
66.64.41.124	A	trekresources.com
66.64.41.124	A	*.trekresources.com
66.64.41.124	A	www.trekresources.com
66.64.41.130	A+PTR	mail.arcticstar.com
66.64.41.138	A	mail.osgsolutions.com
66.64.41.202	PTR	mail.abledebtsettlement.com
66.64.41.203	PTR	ableweb.abledebtsettlement.com
66.64.41.226	A+PTR	exch.cdcouriers.com
66.64.42.18	PTR	bbbody.com
66.64.42.18	PTR	craigscollision.com
66.64.42.18	PTR	tachq.com
66.64.42.37	A	email.grandenergy.com
66.64.42.37	A	mail.grandfinancial.net
66.64.42.43	A+PTR	mail.berryfirm.com
66.64.42.179	A	mail.p-m-s.com
66.64.42.210	PTR	aquiladrilling.com
66.64.42.210	PTR	carres.com
66.64.42.210	PTR	eagleog.com
66.64.43.36	A	mail.robinrobertsmd.com
66.64.43.54	A	bodronfruit.dyndns.org
66.64.43.162	A+PTR	vfw1.dal.logixcom.net
66.64.43.164	A	mail.hmbiweb.com
66.64.43.167	PTR	hosting.logixcom.net
66.64.43.167	A	duncanlaw.com
66.64.43.167	A	www.tealenergy.com
66.64.43.168	PTR	winhosting.logixcom.net
66.64.43.168	A	tulsaenvironmentalconsultant.com
66.64.43.168	A	collegeforall.com
66.64.43.169	PTR	ftp.logixcom.net
66.64.43.226	A+PTR	mail.buschmyers.com
66.64.43.226	A	ns3.specialdelivery.com
66.64.43.226	A	buschmyers.com
66.64.43.251	A	mail.fcidallas.com
66.64.43.251	A	remote.fcidallas.com