Robtex

Up: 203.205.104.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.205.104.0/23
Down right: 203.205.106.0/23

IP	Type	Hostname
203.205.104.247	A+PTR	internet-45857.csf.ne.jp
203.205.106.75	A	internet-46195.csf.ne.jp
203.205.107.75	A	internet-46450.csf.ne.jp
203.205.107.134	A	internet-46509.csf.ne.jp
203.205.107.191	A	internet-46566.csf.ne.jp