Robtex

Up: 66.255.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 66.255.192.0/20
Down right: 66.255.208.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.255.192.0	PTR	fr-lan.msk.i2k.net
66.255.192.243	A	vbwjgnfrbsmywgnploicq.com
66.255.193.202	A	mail.sci-couplings.com
66.255.196.0	A+PTR	0.196.255.66.dsl.dyn.i2k.net
66.255.196.212	A	wyshnclsjvcyqb.com
66.255.197.0	A+PTR	0.197.255.66.unassigned.i2k.net
66.255.197.1	A+PTR	f0-0.76th-core1.gr.i2k.net
66.255.197.34	A	*.wmpn.com
66.255.197.192	PTR	192.197.255.66.dsl.dyn.i2k.net
66.255.197.197	A	197.197.255.66.dsl.dyn.i2k.net
66.255.198.210	A	mail.ujoints.com
66.255.198.253	A	fwall.cyberatech.net
66.255.198.253	A	iamaidiot.com
66.255.199.0	A+PTR	0.199.255.66.dsl.dyn.i2k.net
66.255.199.48	A	mail.jervissfethkeinsurance.com
66.255.199.53	A	mail.hookerdejong.com
66.255.199.160	A+PTR	160.199.255.66.dsl.dyn.i2k.net
66.255.199.224	A+PTR	224.199.255.66.dsl.dyn.i2k.net
66.255.199.232	A	232.199.255.66.dsl.dyn.i2k.net
66.255.199.235	A	235.199.255.66.dsl.dyn.i2k.net
66.255.200.0	PTR	0.200.255.66.unassigned.i2k.net
66.255.200.3	A+PTR	onramp.i2k.com
66.255.200.3	A	i2k.com
66.255.200.3	A	ns1.thinkextreme.com
66.255.201.0	A+PTR	0.201.255.66.dsl.dyn.i2k.net
66.255.201.146	A	silvanov.com
66.255.202.0	A+PTR	0.202.255.66.dsl.dyn.i2k.net
66.255.202.138	A	138.202.255.66.dsl.dyn.i2k.net
66.255.203.0	A+PTR	0.203.255.66.unassigned.i2k.net
66.255.204.74	A	mail.flemingbrothersoil.com
66.255.205.0	A+PTR	0.205.255.66.dsl.dyn.i2k.net
66.255.206.0	A+PTR	0.206.255.66.dsl.dyn.i2k.net
66.255.207.0	A+PTR	0.207.255.66.dsl.dyn.i2k.net
66.255.207.97	PTR	mail.tucs.org
66.255.208.3	A+PTR	3.208.255.66.unassigned.i2k.net
66.255.208.21	A	21.208.255.66.unassigned.i2k.net
66.255.208.159	A	159.208.255.66.dsl.dyn.i2k.net
66.255.209.0	A+PTR	0.209.255.66.unassigned.i2k.net
66.255.209.158	A	158.209.255.66.dsl.dyn.i2k.net
66.255.209.175	A	efa1.pjprzybyla.com
66.255.211.200	PTR	mail.i2k.com
66.255.211.201	PTR	mirror1.i2k.com
66.255.211.204	A	mail.lakeshore.net
66.255.211.204	A	mx02.i2k.com
66.255.211.204	A	mail.txbi.net
66.255.212.0	A+PTR	0.212.255.66.dsl.dyn.i2k.net
66.255.213.0	A+PTR	0.213.255.66.dsl.dyn.i2k.net
66.255.213.62	A	mds2000.com
66.255.215.0	A+PTR	0.215.255.66.unassigned.i2k.net
66.255.216.12	A	nlcst.com
66.255.216.132	PTR	hardcoders.com
66.255.217.0	A+PTR	0.217.255.66.dsl.dyn.i2k.net
66.255.217.10	A	ns1.simec.com.mx
66.255.217.10	A	10.217.255.66.dsl.dyn.i2k.net
66.255.218.0	A+PTR	0.218.255.66.dsl.dyn.i2k.net
66.255.218.35	PTR	mail.sourceonedigital.com
66.255.219.0	A+PTR	0.219.255.66.unassigned.i2k.net
66.255.219.70	A	70.219.255.66.unassigned.i2k.net
66.255.219.81	A	81.219.255.66.unassigned.i2k.net
66.255.219.210	A	210.219.255.66.unassigned.i2k.net
66.255.219.224	A+PTR	224.219.255.66.unassigned.i2k.net
66.255.220.168	A	mail.dovermetals.com
66.255.220.177	A	inet2.trendway.com
66.255.220.191	A	mail.vanbeekscwp.com
66.255.220.199	A	mail.saintisidorechurch.org
66.255.221.67	A	67.221.255.66.static.onw.i2k.net
66.255.221.107	A	smtp.ocfcu.net
66.255.221.108	PTR	mail.ocfcu.net
66.255.222.66	PTR	old-onramp.i2k.com
66.255.222.66	A	lakeshore.net
66.255.222.66	A	weblinkusa.net
66.255.223.222	PTR	mail.championdie.com