Robtex

Up: 66.128.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.128.0.0/23
Down right: 66.128.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.128.0.0	PTR	66.128.0.0.xchangetele.com
66.128.0.2	PTR	66.128.0.2.xchangetele.com
66.128.0.4	PTR	66.128.0.4.xchangetele.com
66.128.0.43	PTR	66.128.0.43.xchangetele.com
66.128.0.45	PTR	66.128.0.45.xchangetele.com
66.128.0.86	PTR	66.128.0.86.xchangetele.com
66.128.0.202	A	mail.challenge-ei.com
66.128.0.203	PTR	66.128.0.203.xchangetele.com
66.128.0.203	A	challenge-ei.net
66.128.0.203	A	www.challenge-ei.net
66.128.1.1	PTR	mail.revivalhhc.org
66.128.1.4	PTR	66.128.1.4.xchangetele.com
66.128.1.14	PTR	66.128.1.14.xchangetele.com
66.128.1.18	PTR	66.128.1.18.xchangetele.com
66.128.1.18	A	mail1.cobblehill.org
66.128.1.25	PTR	66.128.1.25.xchangetele.com
66.128.1.30	PTR	66.128.1.30.xchangetele.com
66.128.1.41	PTR	66.128.1.41.xchangetele.com
66.128.1.43	PTR	66.128.1.43.xchangetele.com
66.128.1.47	PTR	66.128.1.47.xchangetele.com
66.128.1.51	PTR	66.128.1.51.xchangetele.com
66.128.1.55	PTR	66.128.1.55.xchangetele.com
66.128.1.63	PTR	66.128.1.63.xchangetele.com
66.128.1.74	PTR	66.128.1.74.xchangetele.com
66.128.1.86	PTR	66.128.1.86.xchangetele.com
66.128.1.91	PTR	esafe.dor-yeshorim.com
66.128.1.91	A	mail.lchaimcord.com
66.128.1.91	A	*.lchaimcord.com
66.128.1.92	PTR	mail.dor-yeshorim.com
66.128.1.93	PTR	66.128.1.93.xchangetele.com
66.128.1.122	PTR	66.128.1.122.xchangetele.com
66.128.1.122	A	kjjournal.com
66.128.1.141	PTR	66.128.1.141.xchangetele.com
66.128.1.141	A	ezcarnyc.com
66.128.1.141	A	mail.ezcarnyc.com
66.128.1.153	A	*.concordlimo.com
66.128.1.178	PTR	66.128.1.178.xchangetele.com
66.128.1.178	A	mail.goflowip.com
66.128.1.178	A	goflowip.com
66.128.1.211	PTR	66.128.1.211.xchangetele.com
66.128.1.211	A	barracuda3.virginiadare.com
66.128.2.18	PTR	66.128.2.18.xchangetele.com
66.128.2.18	A	centraloffice.net
66.128.2.18	A	www.bigtalkny.com
66.128.2.19	PTR	66.128.2.19.xchangetele.com
66.128.2.23	PTR	66.128.2.23.xchangetele.com
66.128.2.23	A	www.zoneview.com
66.128.2.23	A	zoneview.com
66.128.2.25	A	cfgs.xchangetele.com
66.128.2.36	A+PTR	mx5.xchangetele.com
66.128.2.36	A	mail5.xchangetele.com
66.128.2.38	A	cfg.xchangetele.com
66.128.2.42	PTR	66.128.2.42.xchangetele.com
66.128.2.66	A+PTR	pbx2.xchangetele.com
66.128.2.70	PTR	66.128.2.70.xchangetele.com
66.128.2.139	PTR	66.128.2.139.xchangetele.com
66.128.2.139	A	mail4.xchangetele.com
66.128.2.139	A	mx.justemailing.com
66.128.2.140	A	x3.xchangetele.com
66.128.2.152	A+PTR	ns6.xchangetele.com
66.128.2.152	A	ns3.xchangetele.com
66.128.2.152	A	ns4.xchangetele.com
66.128.2.154	PTR	66.128.2.154.xchangetele.com
66.128.3.10	PTR	66.128.3.10.xchangetele.com
66.128.3.35	A	mail.bpbrokerage.com
66.128.3.65	A	dsl.quicktransferinc.com
66.128.3.127	PTR	66.128.3.127.xchangetele.com
66.128.3.127	A	brooklynbatteryworks.com
66.128.3.135	PTR	66.128.3.135.xchangetele.com
66.128.3.145	PTR	66.128.3.145.xchangetele.com
66.128.3.145	A	mail.gocomdata.com
66.128.3.180	PTR	66.128.3.180.xchangetele.com
66.128.3.191	A	dsl.qualitytradeway.com
66.128.3.219	PTR	66.128.3.219.xchangetele.com
66.128.3.219	A	smtp.ezrasyisroel.org
66.128.3.246	A	ttblk01.tandemtransit.com