Robtex

Up: 66.255.192.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 66.255.192.0/21
Down right: 66.255.200.0/21
(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
66.255.197.19	PTR	19.197.255.66.static.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
66.255.200.18	A+PTR	mail.i2k.com
66.255.200.18	A	mail.thinkextreme.net
66.255.200.18	A	ms.i2k.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