Robtex

Up: 66.255.192.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 66.255.208.0/21
Down right: 66.255.216.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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
66.255.212.48	PTR	mail.alpenaindustries.com
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+PTR	81.219.255.66.unassigned.i2k.net
66.255.219.210	A+PTR	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
66.255.222.83	A+PTR	overpass.i2k.com
66.255.223.222	PTR	mail.championdie.com