Robtex

Up: 123.255.200.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.255.204.0/23
Down right: 123.255.206.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.255.204.27	PTR	ip-123-255-204-27.datautama.net.id
123.255.204.27	A	mail.sacdolive.com
123.255.204.27	A	mail.tabloidcompusician.com
123.255.204.188	PTR	ip-123-255-204-188.datautama.net.id
123.255.205.58	PTR	ip-123-255-205-58.datautama.net.id
123.255.205.60	PTR	ip-123-255-205-60.datautama.net.id
123.255.206.2	PTR	ip-123-255-206-2.datautama.net.id
123.255.206.6	PTR	ip-123-255-206-6.datautama.net.id
123.255.206.65	PTR	ip-123-255-206-65.datautama.net.id
123.255.206.122	PTR	ip-123-255-206-122.datautama.net.id
123.255.206.122	A	ns1.stts.ac.id
123.255.206.123	A	ns2.stts.ac.id
123.255.206.180	PTR	ip-123-255-206-180.datautama.net.id
123.255.207.2	PTR	ip-123-255-207-2.datautama.net.id
123.255.207.10	PTR	ip-123-255-207-10.datautama.net.id
123.255.207.18	PTR	ip-123-255-207-18.datautama.net.id
123.255.207.26	PTR	ip-123-255-207-26.datautama.net.id
123.255.207.50	PTR	ip-123-255-207-50.datautama.net.id
123.255.207.50	A	mail.encpro.email
123.255.207.50	A	encpro.email
123.255.207.60	PTR	ip-123-255-207-60.datautama.net.id
123.255.207.60	A	ns1.motorkawasaki.com
123.255.207.60	A	ns2.motorkawasaki.com
123.255.207.74	PTR	dpanel.docotel.net
123.255.207.74	A	www.docotel.com
123.255.207.74	A	katigaonline.com
123.255.207.75	PTR	ip-123-255-207-75.datautama.net.id
123.255.207.77	PTR	xpanel.docotel.com
123.255.207.77	A	jglcorp.com
123.255.207.77	A	www.cigadingport.com
123.255.207.94	PTR	ip-123-255-207-94.datautama.net.id
123.255.207.142	PTR	mail.shb.sch.id
123.255.207.172	PTR	ip-123-255-207-172.datautama.net.id
123.255.207.188	A	mail.misptbi.com
123.255.207.245	PTR	ip-123-255-207-245.datautama.net.id
123.255.207.245	A	www.infi-nity.com