Robtex

Up: 123.231.240.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 123.231.240.0/24
Down right: 123.231.241.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.231.240.26	A	mail.i3networksecurity.com
123.231.240.28	A+PTR	mail.bumida.co.id
123.231.240.28	A	webmail.bumida.co.id
123.231.240.29	A+PTR	esa.bumida.co.id
123.231.240.242	A+PTR	mx2.olympindo.co.id
123.231.240.243	A+PTR	mx3.olympindo.co.id
123.231.240.243	A	ns2.olympindo.co.id
123.231.240.244	A+PTR	mx1.olympindo.co.id
123.231.240.244	A	ns1.olympindo.co.id
123.231.241.30	A	gtm1.saptaindra.co.id
123.231.241.43	PTR	mail.sentosagroup.com
123.231.241.43	A	mail.tbsgroup.co.id
123.231.241.43	A	mail2.luleyhotels.com
123.231.241.53	A+PTR	singkawang.mtf.co.id
123.231.241.53	A	mx10.mtf.co.id
123.231.241.57	A+PTR	mx5.mtf.co.id
123.231.241.62	A+PTR	webmail.mtf.co.id
123.231.241.77	A	jktowa.iom.or.id
123.231.241.194	A	lgilink.com
123.231.241.237	A	raharja-net.co.id