Robtex

Up: 206.166.0.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 206.166.0.0/25
Down right: 206.166.0.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
206.166.0.10	A	web.illinois.net
206.166.0.10	A	wwwtest.illinois.net
206.166.0.10	A	particle.illinois.net
206.166.0.11	A+PTR	mailgw.illinois.net
206.166.0.11	A	mailgw.lincon.net
206.166.0.12	A	assp.illinois.net
206.166.0.14	A+PTR	tkl.illinois.net
206.166.0.15	PTR	icnstats.illinois.net
206.166.0.17	A+PTR	myicn.illinois.net
206.166.0.70	PTR	cache.google.com
206.166.0.76	PTR	cache.google.com
206.166.0.76	A	r1.sn-paapovpnjxou0gt-nuae.googlevideo.com
206.166.0.76	A	r1.sn-paapovpnjxou0gt-nuae.gvt1.com
206.166.0.77	A	r2---sn-paapovpnjxou0gt-nuae.googlevideo.com
206.166.0.77	A	r2.sn-paapovpnjxou0gt-nuae.gvt1.com
206.166.0.78	PTR	cache.google.com
206.166.0.78	A	r3---sn-paapovpnjxou0gt-nuae.gvt1.com
206.166.0.78	A	r3.sn-paapovpnjxou0gt-nuae.gvt1.com
206.166.0.130	A	perfsonar.illinois.net