Robtex

Up: 103.30.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 103.30.0.0/23
Down right: 103.30.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
103.30.0.2	PTR	2.static-0-30-103.dinustech.net.id
103.30.0.10	PTR	10.static-0-30-103.dinustech.net.id
103.30.0.10	A	speedtest.dinus.ac.id
103.30.0.22	PTR	22.static-0-30-103.dinustech.net.id
103.30.0.33	PTR	33.static-0-30-103.dinustech.net.id
103.30.0.33	A	fortei.org
103.30.0.33	A	hipmi-jateng.org
103.30.0.66	A	dns5.dinustech.com
103.30.0.66	A	konijateng.org
103.30.0.70	PTR	70.static-0-30-103.dinustech.net.id
103.30.0.70	A	dns1.dinustech.com
103.30.1.1	PTR	1.static-1-30-103.dinustech.net.id
103.30.1.1	A	ns1.dinustech.net.id
103.30.1.6	PTR	6.static-1-30-103.dinustech.net.id
103.30.1.18	PTR	18.static-1-30-103.dinustech.net.id
103.30.1.30	PTR	30.static-1-30-103.dinustech.net.id
103.30.1.30	A	ns2.semarangkota.go.id
103.30.1.30	A	dns3.dinustech.com
103.30.1.34	A	stie-aprin.ac.id
103.30.1.36	PTR	36.static-1-30-103.dinustech.net.id
103.30.1.36	A	poltekkes-smg.ac.id
103.30.1.36	A	ns1.poltekkes-smg.ac.id
103.30.1.52	PTR	52.static-1-30-103.dinustech.net.id
103.30.1.52	A	vendetta-ro.com
103.30.1.59	PTR	59.static-1-30-103.dinustech.net.id
103.30.1.59	A	highschool-ro.com
103.30.1.126	PTR	126.static-1-30-103.dinustech.net.id
103.30.1.126	A	mailserver.muganindonesia.com
103.30.1.182	PTR	182.static-1-30-103.dinustech.net.id
103.30.1.182	A	brtsemarang.com
103.30.1.194	PTR	194.static-1-30-103.dinustech.net.id
103.30.1.219	PTR	219.static-103.30-subnet-1.dinustech.net.id
103.30.1.219	A	klinikmatapapandayan.com
103.30.2.2	PTR	2.static-2-30-103.dinustech.net.id
103.30.2.2	A	ns2.dinustech.net.id
103.30.2.223	PTR	223.static-2-30-103.dinustech.net.id
103.30.2.226	A	fengaishu.cn