Robtex

Up: 203.198.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.198.156.0/23
Down right: 203.198.158.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.198.156.1	A+PTR	001.156.198.203.static.netvigator.com
203.198.156.2	A+PTR	002.156.198.203.static.netvigator.com
203.198.156.3	A+PTR	003.156.198.203.static.netvigator.com
203.198.156.4	PTR	004.156.198.203.static.netvigator.com
203.198.156.4	A	exchsrv.qualiman.com.hk
203.198.156.5	PTR	qmhk.com.hk
203.198.156.5	PTR	exchsrv.qualiman.com.hk
203.198.156.5	A	intsrv.qualiman.com.hk
203.198.156.11	A+PTR	011.156.198.203.static.netvigator.com
203.198.156.12	A+PTR	012.156.198.203.static.netvigator.com
203.198.156.13	A+PTR	013.156.198.203.static.netvigator.com
203.198.156.14	A+PTR	014.156.198.203.static.netvigator.com
203.198.156.37	A	infolio.com.hk
203.198.156.43	PTR	043.156.198.203.static.netvigator.com
203.198.156.43	A	ipvpn083043.netvigator.com
203.198.156.111	A+PTR	111.156.198.203.static.netvigator.com
203.198.156.114	A	smtp.chinaassets.com
203.198.156.114	A	smtp.holygene.com
203.198.156.114	A	smtp.firstshanghai.com.hk
203.198.156.115	A	mail.imchk.hk
203.198.156.123	PTR	applestore.com.hk
203.198.156.157	A	primediaintl.com.hk
203.198.157.1	A+PTR	001.157.198.203.static.netvigator.com
203.198.157.2	A+PTR	002.157.198.203.static.netvigator.com
203.198.157.3	A+PTR	003.157.198.203.static.netvigator.com
203.198.157.4	A+PTR	004.157.198.203.static.netvigator.com
203.198.157.5	A+PTR	005.157.198.203.static.netvigator.com
203.198.157.10	PTR	010.157.198.203.static.netvigator.com
203.198.157.11	A+PTR	011.157.198.203.static.netvigator.com
203.198.157.13	A+PTR	013.157.198.203.static.netvigator.com
203.198.157.65	A+PTR	egssurvey.com
203.198.157.65	A	c-products.com.hk
203.198.157.65	A	www.egssurvey.com
203.198.157.85	A+PTR	085.157.198.203.static.netvigator.com
203.198.157.85	A	easyvolunteer.hk
203.198.157.85	A	www.easyvolunteer.hk
203.198.157.115	A+PTR	115.157.198.203.static.netvigator.com
203.198.157.115	A	www.merrillifn.com
203.198.157.118	A	ns1.merrillifn.com.hk
203.198.157.118	A	mail.merrillifn.com.hk
203.198.157.120	A	ipvpn084120.netvigator.com
203.198.157.122	A+PTR	122.157.198.203.static.netvigator.com
203.198.157.122	A	ipvpn084122.netvigator.com
203.198.157.122	A	mailmx1.merrillifn.com
203.198.157.124	A+PTR	124.157.198.203.static.netvigator.com
203.198.157.124	A	mail.ifnasia.com
203.198.157.125	A	ipvpn084125.netvigator.com
203.198.157.145	A+PTR	mail.hastings-hk.com
203.198.157.146	A	ipvpn084146.netvigator.com
203.198.157.148	A+PTR	mail3.hastings-hk.com
203.198.157.150	A+PTR	150.157.198.203.static.netvigator.com
203.198.157.150	A	webmail.hastings-hk.com
203.198.157.150	A	ipvpn084150.netvigator.com
203.198.157.155	A+PTR	mail2.hastings-hk.com
203.198.157.169	A+PTR	169.157.198.203.static.netvigator.com
203.198.157.176	A+PTR	176.157.198.203.static.netvigator.com
203.198.157.179	A	www.ts.edu.hk
203.198.157.221	A+PTR	221.157.198.203.static.netvigator.com
203.198.157.244	A+PTR	244.157.198.203.static.netvigator.com
203.198.158.1	A+PTR	001.158.198.203.static.netvigator.com
203.198.158.2	A+PTR	002.158.198.203.static.netvigator.com
203.198.158.3	A+PTR	003.158.198.203.static.netvigator.com
203.198.158.4	A+PTR	004.158.198.203.static.netvigator.com
203.198.158.5	A+PTR	005.158.198.203.static.netvigator.com
203.198.158.10	PTR	010.158.198.203.static.netvigator.com
203.198.158.11	A+PTR	011.158.198.203.static.netvigator.com
203.198.158.12	A+PTR	012.158.198.203.static.netvigator.com
203.198.158.13	A+PTR	013.158.198.203.static.netvigator.com
203.198.158.14	A+PTR	014.158.198.203.static.netvigator.com
203.198.158.33	PTR	mail.boto.com.hk
203.198.158.66	PTR	066.158.198.203.static.netvigator.com
203.198.158.66	A	ipvpn085066.netvigator.com
203.198.158.66	A	mail.hkwebbank.com
203.198.158.129	PTR	129.158.198.203.static.netvigator.com
203.198.158.129	A	mail2.wtpl.com.hk
203.198.158.129	A	mail2.wtil.com.hk
203.198.158.132	PTR	132.158.198.203.static.netvigator.com
203.198.158.141	PTR	141.158.198.203.static.netvigator.com
203.198.158.147	A+PTR	147.158.198.203.static.netvigator.com
203.198.158.206	A+PTR	206.158.198.203.static.netvigator.com
203.198.158.206	A	terenceli.com
203.198.158.206	A	smtp.terenceli.com
203.198.158.222	A+PTR	222.158.198.203.static.netvigator.com
203.198.159.1	A+PTR	001.159.198.203.static.netvigator.com
203.198.159.2	A+PTR	002.159.198.203.static.netvigator.com
203.198.159.3	A+PTR	003.159.198.203.static.netvigator.com
203.198.159.4	A+PTR	004.159.198.203.static.netvigator.com
203.198.159.5	A+PTR	005.159.198.203.static.netvigator.com
203.198.159.11	A+PTR	011.159.198.203.static.netvigator.com
203.198.159.12	A+PTR	012.159.198.203.static.netvigator.com
203.198.159.13	A+PTR	013.159.198.203.static.netvigator.com
203.198.159.53	A+PTR	mail.stratech.com.hk
203.198.159.90	PTR	090.159.198.203.static.netvigator.com
203.198.159.96	PTR	096.159.198.203.static.netvigator.com
203.198.159.97	A+PTR	097.159.198.203.static.netvigator.com
203.198.159.97	A	nelson-wheeler.rsmnelsonwheeler.com
203.198.159.98	A+PTR	098.159.198.203.static.netvigator.com
203.198.159.98	A	mail.alphalinkgc.com
203.198.159.162	A+PTR	162.159.198.203.static.netvigator.com
203.198.159.162	A	ccccpa.com.hk
203.198.159.163	PTR	mail.ccccpa.com.hk
203.198.159.191	A	191.159.198.203.static.netvigator.com
203.198.159.244	PTR	244.159.198.203.static.netvigator.com
203.198.159.244	A	ipvpn086244.netvigator.com