Robtex

Up: 168.103.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 168.103.8.0/22
Down right: 168.103.12.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
168.103.8.1	A+PTR	chcgpop1.chcg.interprise.net
168.103.8.1	A	interprise.net
168.103.8.1	A	chcg.interprise.net
168.103.15.12	A+PTR	dlls-dsl-gw12.dlls.uswest.net
168.103.15.12	PTR	dlls-dsl-gw12.oss.uswest.net