Robtex

Up: 72.128.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.128.128.0/20
Down right: 72.128.144.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.128.128.1	PTR	mta-72-128-128-1.kc.rr.com
72.128.128.98	PTR	mta-72-128-128-98.kc.rr.com
72.128.128.106	A	vinosplace.com
72.128.128.227	PTR	mta-72-128-128-227.kc.res.rr.com
72.128.132.6	A	popular-watch.com
72.128.132.6	A	dc-45d25e12267a.sacred.website
72.128.132.6	A	mail.waterintuitive.com
72.128.132.210	A+PTR	rrcs-72-128-132-210.sw.biz.rr.com
72.128.132.210	A	ns1.deluxsolutions.net
72.128.132.211	A+PTR	rrcs-72-128-132-211.sw.biz.rr.com
72.128.132.211	A	ns2.deluxsolutions.net
72.128.132.212	PTR	rrcs-72-128-132-212.sw.biz.rr.com
72.128.132.213	PTR	rrcs-72-128-132-213.sw.biz.rr.com
72.128.133.195	A+PTR	rrcs-72-128-133-195.sw.biz.rr.com
72.128.133.195	A	recyclingtimes.com
72.128.133.195	A	sellitzone.com
72.128.134.163	PTR	mta-72-128-134-163.kc.rr.com
72.128.135.97	PTR	mta-72-128-135-97.kc.rr.com
72.128.135.224	PTR	mta-72-128-135-224.kc.rr.com
72.128.135.226	A	goodfaithenergy.com
72.128.135.227	PTR	mta-72-128-135-227.kc.rr.com
72.128.139.178	A	rcwoolseylaw.com
72.128.143.27	A+PTR	rrcs-72-128-143-27.sw.biz.rr.com
72.128.147.114	A+PTR	rrcs-72-128-147-114.sw.biz.rr.com
72.128.149.74	A+PTR	rrcs-72-128-149-74.sw.biz.rr.com
72.128.149.74	A	mail.graydongroup.net
72.128.152.202	A+PTR	rrcs-72-128-152-202.sw.biz.rr.com
72.128.158.196	A+PTR	rrcs-72-128-158-196.sw.biz.rr.com
72.128.158.196	A	globalview.io
72.128.158.196	A	www.globalview.io
72.128.159.203	PTR	raw.thehippo.net
72.128.159.203	PTR	ra.thehippo.net
72.128.159.203	A	chszebras91.com