Robtex

Up: 210.0.224.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 210.0.240.0/21
Down right: 210.0.248.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.0.240.1	A	www.nrihk.com
210.0.240.3	A+PTR	mail.nrihk.com
210.0.247.196	A+PTR	smtp06.on-nets.com
210.0.247.196	A	mail02.on-nets.com
210.0.247.196	A	smtp.on-nets.com
210.0.248.1	PTR	core.hgc.com.hk
210.0.248.3	PTR	core.hgc.com.hk
210.0.248.32	PTR	core.hgc.com.hk
210.0.248.67	PTR	core.hgc.com.hk
210.0.248.211	PTR	core.hgc.com.hk
210.0.250.1	PTR	bbs-1-250-0-210.on-nets.com
210.0.250.2	PTR	bbs-2-250-0-210.on-nets.com
210.0.250.3	PTR	bbs-3-250-0-210.on-nets.com
210.0.250.3	A	traceroute.hgc.com.hk
210.0.250.16	PTR	bbs-16-250-0-210.on-nets.com
210.0.250.17	PTR	bbs-17-250-0-210.on-nets.com
210.0.250.18	PTR	bbs-18-250-0-210.on-nets.com
210.0.250.19	PTR	bbs-19-250-0-210.on-nets.com
210.0.250.32	PTR	bbs-32-250-0-210.on-nets.com
210.0.250.33	PTR	bbs-33-250-0-210.on-nets.com
210.0.250.34	PTR	bbs-34-250-0-210.on-nets.com
210.0.250.35	PTR	bbs-35-250-0-210.on-nets.com
210.0.250.48	PTR	bbs-48-250-0-210.on-nets.com
210.0.250.49	PTR	bbs-49-250-0-210.on-nets.com
210.0.250.50	PTR	bbs-50-250-0-210.on-nets.com
210.0.250.51	PTR	bbs-51-250-0-210.on-nets.com
210.0.250.64	PTR	bbs-64-250-0-210.on-nets.com
210.0.250.65	PTR	bbs-65-250-0-210.on-nets.com
210.0.250.66	PTR	bbs-66-250-0-210.on-nets.com
210.0.250.67	PTR	bbs-67-250-0-210.on-nets.com
210.0.250.80	PTR	bbs-80-250-0-210.on-nets.com
210.0.250.81	PTR	bbs-81-250-0-210.on-nets.com
210.0.250.82	PTR	bbs-82-250-0-210.on-nets.com
210.0.250.83	PTR	bbs-83-250-0-210.on-nets.com
210.0.250.96	PTR	bbs-96-250-0-210.on-nets.com
210.0.250.97	PTR	bbs-97-250-0-210.on-nets.com
210.0.250.98	PTR	bbs-98-250-0-210.on-nets.com
210.0.250.99	PTR	bbs-99-250-0-210.on-nets.com
210.0.250.112	PTR	bbs-112-250-0-210.on-nets.com
210.0.250.113	PTR	bbs-113-250-0-210.on-nets.com
210.0.250.114	PTR	bbs-114-250-0-210.on-nets.com
210.0.250.115	PTR	bbs-115-250-0-210.on-nets.com
210.0.250.128	PTR	bbs-128-250-0-210.on-nets.com
210.0.250.129	PTR	bbs-129-250-0-210.on-nets.com
210.0.250.130	PTR	bbs-130-250-0-210.on-nets.com
210.0.250.131	PTR	bbs-131-250-0-210.on-nets.com
210.0.250.144	PTR	bbs-144-250-0-210.on-nets.com
210.0.250.145	PTR	bbs-145-250-0-210.on-nets.com
210.0.250.146	PTR	bbs-146-250-0-210.on-nets.com
210.0.250.147	PTR	bbs-147-250-0-210.on-nets.com
210.0.250.160	PTR	bbs-160-250-0-210.on-nets.com
210.0.250.161	PTR	bbs-161-250-0-210.on-nets.com
210.0.250.162	PTR	bbs-162-250-0-210.on-nets.com
210.0.250.163	PTR	bbs-163-250-0-210.on-nets.com
210.0.250.176	PTR	bbs-176-250-0-210.on-nets.com
210.0.250.177	PTR	bbs-177-250-0-210.on-nets.com
210.0.250.178	PTR	bbs-178-250-0-210.on-nets.com
210.0.250.179	PTR	bbs-179-250-0-210.on-nets.com
210.0.250.192	PTR	bbs-192-250-0-210.on-nets.com
210.0.250.193	PTR	bbs-193-250-0-210.on-nets.com
210.0.250.194	PTR	bbs-194-250-0-210.on-nets.com
210.0.250.195	PTR	bbs-195-250-0-210.on-nets.com
210.0.250.208	PTR	bbs-208-250-0-210.on-nets.com
210.0.250.209	PTR	bbs-209-250-0-210.on-nets.com
210.0.250.210	PTR	bbs-210-250-0-210.on-nets.com
210.0.250.211	PTR	bbs-211-250-0-210.on-nets.com
210.0.250.224	PTR	bbs-224-250-0-210.on-nets.com
210.0.250.225	PTR	bbs-225-250-0-210.on-nets.com
210.0.250.226	PTR	bbs-226-250-0-210.on-nets.com
210.0.250.227	PTR	bbs-227-250-0-210.on-nets.com
210.0.250.240	PTR	bbs-240-250-0-210.on-nets.com
210.0.250.241	PTR	bbs-241-250-0-210.on-nets.com
210.0.250.242	PTR	bbs-242-250-0-210.on-nets.com
210.0.250.243	PTR	bbs-243-250-0-210.on-nets.com
210.0.254.1	PTR	a210-0-254-1.deploy.akamaitechnologies.com
210.0.255.65	A+PTR	nms65.hgc.com.hk
210.0.255.124	A	nms04.hgc.com.hk
210.0.255.130	PTR	efax.on-nets.com
210.0.255.130	A	efax01.hgc.com.hk
210.0.255.133	A	relayip.on-nets.com
210.0.255.134	A	smtpip01.on-nets.com
210.0.255.134	A	lbel.com.hk
210.0.255.137	A	lbel.com.hk
210.0.255.146	A	my.threebb.com.hk
210.0.255.146	A	my.hgcbroadband.com
210.0.255.148	A	efax.hgcbroadband.com
210.0.255.150	A	relayip.on-nets.com
210.0.255.153	A	relay.on-nets.com
210.0.255.160	A	skype.threebb.com.hk
210.0.255.160	A	hgcbroadband.com
210.0.255.160	A	www.hgcbroadband.com
210.0.255.161	PTR	smtpip02.on-nets.com
210.0.255.164	A	mail02.on-nets.com
210.0.255.164	A	smtp.on-nets.com
210.0.255.164	A	lbel.com.hk
210.0.255.167	A	relay.on-nets.com
210.0.255.170	A	relay.on-nets.com
210.0.255.170	A	hgcbackup.scmedia.com.hk
210.0.255.176	A+PTR	smtp.3gmail.hk
210.0.255.180	A	pf01.hutchcity.com
210.0.255.181	A	smtpip01.hutchcity.com
210.0.255.184	A	ddns01.net-yan.com
210.0.255.192	A	metronet.hgc.com.hk
210.0.255.195	A	ddns02.net-yan.com
210.0.255.208	A+PTR	ldap03.net-yan.com
210.0.255.209	A+PTR	news.hgc.com.hk
210.0.255.209	A	news.hgcbroadband.com
210.0.255.210	PTR	smtp01.net-yan.com
210.0.255.210	A	smtp01.hgcbroadband.com
210.0.255.211	PTR	web.on-nets.com
210.0.255.224	A	relay.on-nets.com
210.0.255.224	A	hgcbackup.scmedia.com.hk
210.0.255.225	A	notify.blackberry.on-nets.com
210.0.255.225	A	mail.blackberry.on-nets.com
210.0.255.226	PTR	rbsdns33.net-yan.com
210.0.255.230	A	relayip.on-nets.com
210.0.255.231	A	relayip.on-nets.com
210.0.255.241	A	tucows.hgcbroadband.com
210.0.255.241	A	hgc.tucows.com
210.0.255.242	A+PTR	inbound.on-nets.com
210.0.255.243	A+PTR	ldap02.net-yan.com