Robtex

Up: 101.53.12.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 101.53.12.0/24
Down right: 101.53.13.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
101.53.12.3	PTR	ci53.12-3.netnam.vn
101.53.12.5	PTR	ci53.12-5.netnam.vn
101.53.12.7	PTR	ci53.12-7.netnam.vn
101.53.12.13	PTR	ci53.12-13.netnam.vn
101.53.12.15	PTR	ci53.12-15.netnam.vn
101.53.12.18	PTR	ci53.12-18.netnam.vn
101.53.12.22	A+PTR	mail.pve.com.vn
101.53.12.27	PTR	ci53.12-27.netnam.vn
101.53.12.34	PTR	ci53.12-34.netnam.vn
101.53.12.38	PTR	ci53.12-38.netnam.vn
101.53.12.44	PTR	ci53.12-44.netnam.vn
101.53.12.48	PTR	ci53.12-48.netnam.vn
101.53.12.49	PTR	ci53.12-49.netnam.vn
101.53.12.52	PTR	ci53.12-52.netnam.vn
101.53.12.52	A	mail.vocarimex.com.vn
101.53.12.53	PTR	ci53.12-53.netnam.vn
101.53.12.54	PTR	ci53.12-54.netnam.vn
101.53.12.54	A	mail.dbcfood.vn
101.53.12.57	PTR	ci53.12-57.netnam.vn
101.53.12.59	PTR	ci53.12-59.netnam.vn
101.53.12.63	PTR	ci53.12-63.netnam.vn
101.53.12.66	PTR	ci53.12-66.netnam.vn
101.53.12.67	A	hqhcm.com
101.53.12.69	PTR	ci53.12-69.netnam.vn
101.53.12.74	PTR	ci53.12-74.netnam.vn
101.53.12.76	PTR	ci53.12-76.netnam.vn
101.53.12.80	PTR	ci53.12-80.netnam.vn
101.53.12.81	PTR	ci53.12-81.netnam.vn
101.53.12.82	PTR	mail1.sovicoholdings.com
101.53.12.82	A	mail.sovicoholdings.com
101.53.12.83	A+PTR	mail.nud.com.vn
101.53.12.85	PTR	ci53.12-85.netnam.vn
101.53.12.85	A	sovicoholdings.com
101.53.12.86	A	tech.sovicoholdings.com
101.53.12.90	PTR	ci96.97-90.netnam.vn
101.53.12.94	PTR	ci96.97-94.netnam.vn
101.53.12.98	PTR	ci53.12-98.netnam.vn
101.53.12.98	A	mail.htv.com.vn
101.53.12.100	PTR	ci96.97-100.netnam.vn
101.53.12.101	PTR	ci53.12-101.netnam.vn
101.53.12.102	A	ns1.htv.com.vn
101.53.12.104	PTR	ci96.97-104.netnam.vn
101.53.12.105	PTR	ci96.97-105.netnam.vn
101.53.12.113	PTR	ci96.97-113.netnam.vn
101.53.12.114	PTR	ci96.97-114.netnam.vn
101.53.12.114	A	qc-api-f8.pycogroup.com
101.53.12.114	A	monkeykidshop.com
101.53.12.124	PTR	ci96.97-124.netnam.vn
101.53.12.134	PTR	ci96.97-134.netnam.vn
101.53.12.138	PTR	ci96.97-138.netnam.vn
101.53.12.139	PTR	ci96.97-139.netnam.vn
101.53.12.142	PTR	ci96.97-142.netnam.vn
101.53.12.144	PTR	ci96.97-144.netnam.vn
101.53.12.150	PTR	ci96.97-150.netnam.vn
101.53.12.155	PTR	ci96.97-155.netnam.vn
101.53.12.159	PTR	ci96.97-159.netnam.vn
101.53.12.160	PTR	ci96.97-160.netnam.vn
101.53.12.161	PTR	ci53.12-161.netnam.vn
101.53.12.162	A+PTR	webmail.dattoanphat.vn
101.53.12.162	A	dattoanphat.vn
101.53.12.164	PTR	ci53.12-164.netnam.vn
101.53.12.164	A	mail.tuongan.com.vn
101.53.12.165	PTR	ci53.12-165.netnam.vn
101.53.12.165	A	mail.kdc.vn
101.53.12.172	PTR	ci96.97-172.netnam.vn
101.53.12.174	PTR	ci96.97-174.netnam.vn
101.53.12.175	PTR	ci96.97-175.netnam.vn
101.53.12.176	PTR	ci96.97-176.netnam.vn
101.53.12.178	PTR	ci96.97-178.netnam.vn
101.53.12.180	PTR	ci96.97-180.netnam.vn
101.53.12.183	PTR	ci96.97-183.netnam.vn
101.53.12.184	PTR	ci96.97-184.netnam.vn
101.53.12.185	PTR	ci96.97-185.netnam.vn
101.53.12.187	PTR	ci96.97-187.netnam.vn
101.53.12.188	PTR	ci96.97-188.netnam.vn
101.53.12.193	PTR	ci96.97-193.netnam.vn
101.53.12.200	PTR	ci96.97-200.netnam.vn
101.53.12.201	PTR	ci96.97-201.netnam.vn
101.53.12.204	PTR	ci96.97-204.netnam.vn
101.53.12.205	PTR	ci96.97-205.netnam.vn
101.53.12.211	PTR	ci96.97-211.netnam.vn
101.53.12.212	PTR	ci96.97-212.netnam.vn
101.53.12.213	PTR	ci96.97-213.netnam.vn
101.53.12.215	PTR	ci96.97-215.netnam.vn
101.53.12.216	PTR	ci96.97-216.netnam.vn
101.53.12.222	PTR	ci53.12-222.netnam.vn
101.53.12.222	A	dev5.sofresh.vn
101.53.12.234	PTR	ci96.97-234.netnam.vn
101.53.12.241	PTR	ci96.97-241.netnam.vn
101.53.12.251	PTR	ci96.97-251.netnam.vn
101.53.12.252	PTR	ci96.97-252.netnam.vn
101.53.13.33	PTR	mail.tdt.edu.vn
101.53.13.34	PTR	mail.tdt.edu.vn
101.53.13.34	A	www.tdt.edu.vn
101.53.13.34	A	tdt.edu.vn
101.53.13.35	PTR	ci53.13-35.netnam.vn
101.53.13.35	A	mail.tut.edu.vn
101.53.13.35	A	learninginfo.tdt.edu.vn
101.53.13.36	PTR	ci53.13-36.netnam.vn
101.53.13.36	A	survey-beta.tdtu.edu.vn
101.53.13.36	A	lichhoc-lichthi.tdt.edu.vn
101.53.13.40	A	mail.tdt.edu.vn
101.53.13.43	PTR	mta2.tdt.edu.vn
101.53.13.45	PTR	mail.tdt.edu.vn