Robtex

Up: 66.27.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 66.27.0.0/20
Down right: 66.27.16.0/20

IP	Type	Hostname
66.27.4.2	PTR	mta-66-27-4-2.natnow.rr.com
66.27.4.69	A	mta-66-27-4-69.socal.rr.com
66.27.7.2	PTR	mta-66-27-7-2.natnow.rr.com
66.27.7.132	A	mta-66-27-7-132.socal.rr.com
66.27.20.34	PTR	mta-66-27-20-34.natnow.rr.com
66.27.20.51	A	cpe-66-27-20-51.socal.res.rr.com
66.27.21.0	PTR	mta-66-27-21-0.natnow.rr.com
66.27.21.2	PTR	cpe-66-27-21-2.socal.res.rr.com
66.27.23.97	PTR	cpe-66-27-23-97.socal.res.rr.com