Robtex

Up: 208.82.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.82.12.0/23
Down right: 208.82.14.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.82.12.8	PTR	rainbow-208.82.12.8.rainbowbroadband.com
208.82.12.9	A+PTR	rainbow-208.82.12.9.rainbowbroadband.com
208.82.12.10	PTR	rainbow-208.82.12.10.rainbowbroadband.com
208.82.12.13	A+PTR	rainbow-208.82.12.13.rainbowbroadband.com
208.82.12.15	PTR	rainbow-208.82.12.15.rainbowbroadband.com
208.82.12.28	PTR	mail2.shoparc.com
208.82.12.40	PTR	voice.nex9.net
208.82.12.40	A	mail.nex9.net
208.82.12.63	PTR	buero-208.82.12.63.rainbowbroadband.com
208.82.12.64	PTR	meetup-208.82.12.64.rainbowbroadband.com
208.82.12.114	A+PTR	mail.araca.com
208.82.12.178	A	mail.rag-bone.com
208.82.12.194	PTR	support.valiant-ny.com
208.82.12.213	PTR	mail3.usercentric.net
208.82.13.15	PTR	208.82.13.15.rainbowbroadband.com
208.82.13.22	PTR	mail.anthony.com
208.82.13.22	A	mail.actionformen.com
208.82.13.22	A	rondeel.com
208.82.13.106	A	gateway.eyeballnyc.com
208.82.13.142	PTR	208.82.13.142.rainbowbroadband.com
208.82.13.144	PTR	208.82.13.144.rainbowbroadband.com
208.82.13.145	PTR	208.82.13.145.rainbowbroadband.com
208.82.13.153	A	*.delightfultours.com
208.82.13.158	A+PTR	hwmail01.hariworld.com
208.82.13.158	A	*.hariworld.com
208.82.13.158	A	email.hariworld.com
208.82.13.174	A	bigsky-radio.com
208.82.13.226	PTR	208.82.13.226.rainbowbroadband.com
208.82.14.1	A+PTR	ns2.rbitech.net
208.82.14.2	A	nms2.rbitech.net
208.82.14.17	A+PTR	ns1.rbitech.net
208.82.14.81	PTR	208.82.14.81.rainbowbroadband.com
208.82.14.138	PTR	208.82.14.138.rainbowbroadband.com
208.82.14.138	A	mail.lonelyleaves.com
208.82.14.138	A	olivetreeservices.com
208.82.14.154	A	a-208-82-14-154.triciapeck.com
208.82.14.187	PTR	208.82.14.187.rainbowbroadband.com
208.82.14.224	PTR	208.82.14.224.rainbowbroadband.com
208.82.14.230	A	smtp6.cfglobal.com
208.82.15.18	A+PTR	pulsemusicny.com
208.82.15.18	A	mail.pulsemusicny.com
208.82.15.42	A	11madison.nyc
208.82.15.66	A	urmsonasl.com
208.82.15.74	PTR	xserve.mac-tech.net
208.82.15.74	A	gw1.audioengine.net
208.82.15.147	A	brokerdealercrm.com
208.82.15.154	A	mail.forwardmm.com
208.82.15.180	A	mailny.e4x.com