Robtex

Up: 203.198.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.198.48.0/23
Down right: 203.198.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.198.48.1	A+PTR	001.48.198.203.static.netvigator.com
203.198.48.2	A+PTR	002.48.198.203.static.netvigator.com
203.198.48.3	A+PTR	003.48.198.203.static.netvigator.com
203.198.48.4	A+PTR	004.48.198.203.static.netvigator.com
203.198.48.5	A+PTR	005.48.198.203.static.netvigator.com
203.198.48.10	A+PTR	010.48.198.203.static.netvigator.com
203.198.48.11	A+PTR	011.48.198.203.static.netvigator.com
203.198.48.12	A+PTR	012.48.198.203.static.netvigator.com
203.198.48.13	A+PTR	013.48.198.203.static.netvigator.com
203.198.48.14	A+PTR	014.48.198.203.static.netvigator.com
203.198.48.72	A+PTR	072.48.198.203.static.netvigator.com
203.198.48.131	PTR	131.48.198.203.static.netvigator.com
203.198.48.131	A	www.ywgs.edu.hk
203.198.48.172	A+PTR	172.48.198.203.static.netvigator.com
203.198.48.173	A+PTR	173.48.198.203.static.netvigator.com
203.198.48.178	A	178.48.198.203.static.netvigator.com
203.198.48.210	A+PTR	210.48.198.203.static.netvigator.com
203.198.49.1	A+PTR	001.49.198.203.static.netvigator.com
203.198.49.3	A+PTR	003.49.198.203.static.netvigator.com
203.198.49.4	A+PTR	004.49.198.203.static.netvigator.com
203.198.49.5	A+PTR	005.49.198.203.static.netvigator.com
203.198.49.10	A+PTR	010.49.198.203.static.netvigator.com
203.198.49.11	A+PTR	011.49.198.203.static.netvigator.com
203.198.49.12	A+PTR	012.49.198.203.static.netvigator.com
203.198.49.13	A+PTR	013.49.198.203.static.netvigator.com
203.198.49.14	A+PTR	014.49.198.203.static.netvigator.com
203.198.49.107	A	ipvpn004107.netvigator.com
203.198.49.161	A+PTR	161.49.198.203.static.netvigator.com
203.198.49.161	A	mailin.mycredit.hk
203.198.49.161	A	tumx01.transunion-hk.com
203.198.49.162	PTR	162.49.198.203.static.netvigator.com
203.198.49.163	PTR	163.49.198.203.static.netvigator.com
203.198.49.165	A+PTR	165.49.198.203.static.netvigator.com
203.198.49.201	A	ipvpn004201.netvigator.com
203.198.49.213	A	ipvpn004213.netvigator.com
203.198.49.215	PTR	215.49.198.203.static.netvigator.com
203.198.50.2	A+PTR	002.50.198.203.static.netvigator.com
203.198.50.3	A+PTR	003.50.198.203.static.netvigator.com
203.198.50.4	A+PTR	004.50.198.203.static.netvigator.com
203.198.50.5	A+PTR	005.50.198.203.static.netvigator.com
203.198.50.10	A+PTR	010.50.198.203.static.netvigator.com
203.198.50.11	A+PTR	011.50.198.203.static.netvigator.com
203.198.50.12	A+PTR	012.50.198.203.static.netvigator.com
203.198.50.13	A+PTR	013.50.198.203.static.netvigator.com
203.198.50.14	A+PTR	014.50.198.203.static.netvigator.com
203.198.50.33	A+PTR	033.50.198.203.static.netvigator.com
203.198.50.35	PTR	035.50.198.203.static.netvigator.com
203.198.50.59	A	059.50.198.203.static.netvigator.com
203.198.50.65	PTR	065.50.198.203.static.netvigator.com
203.198.50.66	A	066.50.198.203.static.netvigator.com
203.198.50.68	PTR	068.50.198.203.static.netvigator.com
203.198.50.82	A	ipvpn007082.netvigator.com
203.198.50.84	A	mail.pathlabhk.com
203.198.50.84	A	ipvpn007084.netvigator.com
203.198.50.90	A	pathlabhk.com
203.198.50.90	A	www.pathlabhk.com
203.198.50.91	A	ns1.pathlabhk.com
203.198.50.91	A	mail.pathlab-hk.com
203.198.50.93	A	www.pathlab.hk
203.198.50.105	A+PTR	105.50.198.203.static.netvigator.com
203.198.50.144	A	144.50.198.203.static.netvigator.com
203.198.50.163	PTR	163.50.198.203.static.netvigator.com
203.198.50.182	A	ipvpn007182.netvigator.com
203.198.50.188	PTR	mail.manyue.com
203.198.50.188	A	ipvpn007188.netvigator.com
203.198.50.189	PTR	mail.manyue.com
203.198.50.201	A	ipvpn007201.netvigator.com
203.198.51.1	A+PTR	001.51.198.203.static.netvigator.com
203.198.51.2	A+PTR	002.51.198.203.static.netvigator.com
203.198.51.3	A+PTR	003.51.198.203.static.netvigator.com
203.198.51.4	A+PTR	004.51.198.203.static.netvigator.com
203.198.51.5	A+PTR	005.51.198.203.static.netvigator.com
203.198.51.10	A+PTR	010.51.198.203.static.netvigator.com
203.198.51.11	A+PTR	011.51.198.203.static.netvigator.com
203.198.51.12	A+PTR	012.51.198.203.static.netvigator.com
203.198.51.13	A+PTR	013.51.198.203.static.netvigator.com
203.198.51.14	A+PTR	014.51.198.203.static.netvigator.com
203.198.51.17	PTR	017.51.198.203.static.netvigator.com
203.198.51.27	A	htcco.dyndns.org
203.198.51.50	PTR	050.51.198.203.static.netvigator.com
203.198.51.50	A	ns.mcafeedemo.com
203.198.51.50	A	www.mcafeedemo.com
203.198.51.52	A	mcafeedemo.com
203.198.51.56	A	ns.mcafeehk.com
203.198.51.77	PTR	077.51.198.203.static.netvigator.com
203.198.51.77	A	ipvpn009077.netvigator.com
203.198.51.82	A	ipvpn009082.netvigator.com
203.198.51.114	A	ipvpn009114.netvigator.com
203.198.51.115	PTR	smtp.chinaassets.com
203.198.51.115	PTR	smtp.mystockhk.com
203.198.51.115	PTR	smtp.firstshanghai.com.hk
203.198.51.116	A	wan1.wtcapital.com.hk
203.198.51.120	A+PTR	120.51.198.203.static.netvigator.com
203.198.51.121	A+PTR	mail.tsld.com
203.198.51.121	A	ipvpn009121.netvigator.com
203.198.51.121	A	mail1.taisangland.com.hk
203.198.51.172	A+PTR	172.51.198.203.static.netvigator.com
203.198.51.193	A+PTR	193.51.198.203.static.netvigator.com
203.198.51.203	A+PTR	203.51.198.203.static.netvigator.com
203.198.51.210	A	polyhkss.com