Robtex

Up: 220.216.120.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 220.216.124.0/23
Down right: 220.216.126.0/23

IP	Type	Hostname
220.216.124.214	A+PTR	natc214.eastcom.ne.jp
220.216.125.63	A+PTR	natd063.eastcom.ne.jp
220.216.125.130	A+PTR	natd130.eastcom.ne.jp
220.216.126.24	PTR	nate024.eastcom.ne.jp
220.216.126.88	A+PTR	nate088.eastcom.ne.jp
220.216.126.170	A+PTR	nate170.eastcom.ne.jp
220.216.127.38	A+PTR	natf038.eastcom.ne.jp
220.216.127.79	A+PTR	natf079.eastcom.ne.jp
220.216.127.156	A+PTR	natf156.eastcom.ne.jp
220.216.127.182	A+PTR	natf182.eastcom.ne.jp
220.216.127.196	A+PTR	natf196.eastcom.ne.jp
220.216.127.202	A+PTR	natf202.eastcom.ne.jp