Robtex

Up: 223.255.142.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 223.255.143.0/25
Down right: 223.255.143.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
223.255.143.36	PTR	autodiscover.mfjebsengroup.com
223.255.143.36	PTR	mail.datum-jebsen.com
223.255.143.36	PTR	mail.jebsenholidays.com
223.255.143.37	A	zimbra.jebsentravel.com
223.255.143.45	PTR	mx01.mfjebsengroup.com
223.255.143.45	A+PTR	mx02.mfjebsengroup.com
223.255.143.45	PTR	barracuda.sepd.org.hk
223.255.143.46	PTR	mx01.mfjebsengroup.com
223.255.143.46	PTR	mail1.jebsen-insurance.com
223.255.143.46	PTR	mfjmail01.jebsen-insurance.com
223.255.143.50	PTR	barracuda.jebsenholidays.com
223.255.143.50	A+PTR	mailbackup.jebsenholidays.com
223.255.143.50	PTR	barracuda.jebsentravel.com
223.255.143.51	PTR	mx01.mfjebsengroup.com
223.255.143.51	PTR	webmail.jebsentravel.com
223.255.143.51	PTR	barracuda.sepd.org.hk
223.255.143.52	A	mail.bcdtravel.hk
223.255.143.52	A	webmail.jebsentravelmgt.com
223.255.143.52	A	mail.jebsentravelmgt.com
223.255.143.59	A	mailbackup.jebsenholidays.com
223.255.143.59	A	mailbackup.jebsentravelmgt.com
223.255.143.61	A	mfjebsen.com
223.255.143.61	A	barracuda.mfjebsengroup.com
223.255.143.61	A	mail.jebsentravel.com
223.255.143.72	A	www.v-logic.net
223.255.143.72	A	v-logic.net
223.255.143.77	A	webmail.v-logic.net