Robtex

Up: 219.240.80.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 219.240.80.0/24
Down right: 219.240.81.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
219.240.81.3	A	mail.roadbrowser.com
219.240.81.130	PTR	bookcosmos.com.81.240.219.in-addr.arpa
219.240.81.130	A	www.songjingu.com
219.240.81.130	A	www.kbooktest.co.kr
219.240.81.133	A	mail.bookcon.com
219.240.81.133	A	mail.bookcosmos.com