Robtex

Up: 72.129.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.129.192.0/20
Down right: 72.129.208.0/20

IP	Type	Hostname
72.129.220.1	PTR	cpe-72-129-220-1.new.res.rr.com
72.129.220.23	A	denmrf01-vsig.as.ims.rr.com
72.129.220.32	PTR	cpe-72-129-220-32.new.res.rr.com
72.129.220.33	PTR	cpe-72-129-220-33.new.res.rr.com
72.129.220.35	PTR	cpe-72-129-220-35.new.res.rr.com
72.129.220.161	PTR	cpe-72-129-220-161.new.res.rr.com
72.129.220.163	PTR	cpe-72-129-220-163.new.res.rr.com