Robtex

Up: 64.66.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 64.66.84.0/23
Down right: 64.66.86.0/23

IP	Type	Hostname
64.66.84.7	PTR	www.mmlonline.com
64.66.85.10	PTR	barracuda.msmoc.com
64.66.85.13	PTR	mail.msmoc.com
64.66.85.35	A+PTR	ns1.knobias.com
64.66.85.38	A	extranet.knobias.com
64.66.85.46	A+PTR	smtp.knobias.com
64.66.85.48	A+PTR	www.knobias.com
64.66.85.48	A	knobias.com
64.66.85.49	A	cobrand.knobias.com
64.66.85.98	PTR	mail.cctb.com
64.66.85.117	PTR	filter.kitenetworks.com
64.66.85.226	PTR	www.slstriad.com
64.66.85.253	PTR	ninja.expetel.net
64.66.86.2	PTR	mail.rbmsa.com
64.66.86.18	PTR	mail.stirlingprop.com
64.66.86.27	PTR	mail.stirlingprop.com
64.66.86.34	PTR	mail.waggonereng.com
64.66.86.35	PTR	vision.waggonereng.com
64.66.86.38	PTR	mx2.waggonereng.com
64.66.86.134	PTR	mail.excessriskms.com
64.66.87.16	PTR	fccwebadmin.fountainconstruction.com
64.66.87.17	PTR	apps.fountainconstruction.com