Robtex

Up: 61.66.42.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 61.66.42.0/25
Down right: 61.66.42.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
61.66.42.1	PTR	ll-61-66-42-1.ll.sparqnet.net
61.66.42.10	A+PTR	mail.lucky-tools.com.tw
61.66.42.10	A	lucky-tools.com.tw
61.66.42.10	A	mail.swell-tools.com.tw
61.66.42.13	A+PTR	spam.lucky-tools.com.tw
61.66.42.13	A	spam.swell-tools.com.tw
61.66.42.243	PTR	ll-61-66-42-243.ll.sparqnet.net