Robtex

Up: 61.66.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 61.66.16.0/23
Down right: 61.66.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
61.66.17.2	PTR	ll-61-66-17-2.ll.sparqnet.net
61.66.17.70	PTR	ll-61-66-17-70.ll.sparqnet.net
61.66.17.78	A+PTR	ll-61-66-17-78.ll.sparqnet.net
61.66.17.78	A	ns2.fihspec.com
61.66.17.79	PTR	ll-61-66-17-79.ll.sparqnet.net
61.66.17.79	A	ns.fihspec.com
61.66.17.79	A	ns1.fihspec.com
61.66.17.81	A+PTR	spec-ty-mlog.fihspec.com
61.66.17.81	A	mailserver.fihspec.com
61.66.17.88	A	ll-61-66-17-88.ll.sparqnet.net
61.66.17.95	PTR	ll-61-66-17-95.ll.sparqnet.net
61.66.17.96	PTR	ll-61-66-17-96.ll.sparqnet.net
61.66.17.111	PTR	ll-61-66-17-111.ll.sparqnet.net
61.66.17.112	PTR	ll-61-66-17-112.ll.sparqnet.net
61.66.17.189	PTR	www.wun-ching.com.tw
61.66.18.6	A+PTR	ms.clevo.com.tw
61.66.18.16	PTR	ms1.clevo.com.tw
61.66.18.24	A+PTR	e.clevo.com.tw
61.66.18.24	A+PTR	www.clevo.com.tw
61.66.18.24	A	www.clevo.com
61.66.18.26	PTR	clevo.com.tw
61.66.18.26	PTR	ms1.clevo.com.tw
61.66.18.26	PTR	ms2.clevo.com.tw
61.66.18.38	A+PTR	rma01.clevo.com.tw
61.66.18.39	A	eis0.clevo.com.tw
61.66.18.65	A+PTR	owa.clevo.com.tw
61.66.18.65	PTR	wac.clevo.com.tw
61.66.18.65	PTR	webapp.clevo.com.tw
61.66.18.82	A	bpm.clevo.com.tw
61.66.18.253	A+PTR	dns.clevo.com.tw
61.66.18.253	A	dns.w2k.idv.tw
61.66.18.253	A	dns.saintc.idv.tw
61.66.19.0	PTR	61-66-19-0.ll.static.sparqnet.net
61.66.19.130	PTR	smtp.xgitech.com
61.66.19.133	PTR	61-66-19-133.ll.static.sparqnet.net
61.66.19.159	PTR	61-66-19-159.ll.static.sparqnet.net
61.66.19.195	PTR	mx1.mosart.com
61.66.19.234	PTR	dns.qsitw.com
61.66.19.249	PTR	mailgw.qsitw.com