Robtex

Up: 220.231.120.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 220.231.120.0/23
Down right: 220.231.122.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
220.231.120.0	PTR	localhost
220.231.120.11	PTR	localhost
220.231.120.46	PTR	localhost
220.231.120.56	PTR	localhost
220.231.120.138	PTR	localhost
220.231.121.1	A	viettelvas.vn
220.231.121.1	A	www.viettelvas.vn
220.231.121.12	A+PTR	mrs.mobimail.viettel.com.vn
220.231.121.14	A	mobimail.viettel.com.vn
220.231.121.14	A	imail.vietteltelecom.vn
220.231.121.14	A	www.mobimail.viettel.com.vn
220.231.121.15	PTR	mrs2.mobimail.viettel.com.vn
220.231.121.27	A	tracuocadsl.vietteltelecom.vn
220.231.121.96	A+PTR	mail.vietteltelecom.vn
220.231.122.68	A	pgdhalong.edu.vn
220.231.122.68	A	www.pgdmongcai.edu.vn
220.231.122.68	A	quangninh.edu.vn
220.231.122.98	A	erevl.com
220.231.122.98	A	fit.vinhuni.edu.vn
220.231.122.99	A	a1k48-hs.net
220.231.122.99	A	luyenthib1.com
220.231.122.100	A	mail.vinuceli.edu.vn
220.231.122.100	A	vinhuni.edu.vn
220.231.122.100	A	www.vinhuni.edu.vn
220.231.122.105	A	www.phim07.com
220.231.122.105	A	kyucteen.info
220.231.122.105	A	www.kyucteen.info
220.231.122.108	A	tvs.vinhuni.edu.vn
220.231.122.109	A	student.vinhuni.edu.vn
220.231.122.110	A	lib.vinhuni.edu.vn
220.231.122.113	A	dns1.nuce.edu.vn
220.231.122.114	A	www.nuce.edu.vn
220.231.122.114	A	vlxd.nuce.edu.vn
220.231.122.114	A	dns2.nuce.edu.vn
220.231.122.222	A	daihochalong.edu.vn
220.231.122.242	A	sv14.tlu.edu.vn
220.231.122.243	A	thanglongsolution.com
220.231.122.243	A	globits.net
220.231.122.243	A	thanglongvina.com
220.231.122.249	A	ns.tuvan123.com
220.231.122.250	A	cse.wru.edu.vn
220.231.122.250	A	fem.wru.edu.vn
220.231.122.250	A	bkcte.com
220.231.122.251	A	ns.tuvan123.com
220.231.123.51	PTR	localhost
220.231.123.97	PTR	localhost
220.231.123.97	A	elearning.erp.viettel.vn
220.231.123.103	PTR	localhost
220.231.123.255	PTR	localhost