Robtex

Up: 210.3.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 210.3.48.0/23
Down right: 210.3.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.3.48.10	PTR	remote.hk.amassfreight.com
210.3.48.158	PTR	mail.roccomagic.com.hk
210.3.48.158	PTR	www.roccomagic.com.hk
210.3.48.182	A+PTR	www.apgglobal.com
210.3.48.182	A	greenpieces.com
210.3.48.182	A	zimbracs.apgglobal.com
210.3.49.121	PTR	hgc1.ortuscapital.com
210.3.49.121	PTR	hgc2.ortuscapital.com
210.3.49.121	PTR	hgc3.ortuscapital.com
210.3.49.122	PTR	hgc1.ortuscapital.com
210.3.49.122	PTR	hgc2.ortuscapital.com
210.3.49.122	PTR	hgc3.ortuscapital.com
210.3.49.123	PTR	hgc1.ortuscapital.com
210.3.49.123	PTR	hgc2.ortuscapital.com
210.3.49.123	PTR	hgc3.ortuscapital.com
210.3.49.124	PTR	hgc1.ortuscapital.com
210.3.49.124	PTR	hgc2.ortuscapital.com
210.3.49.124	PTR	hgc3.ortuscapital.com
210.3.49.125	PTR	hgc1.ortuscapital.com
210.3.49.125	PTR	hgc2.ortuscapital.com
210.3.49.125	PTR	hgc3.ortuscapital.com
210.3.49.126	PTR	hgc1.ortuscapital.com
210.3.49.126	PTR	hgc2.ortuscapital.com
210.3.49.126	PTR	hgc3.ortuscapital.com
210.3.49.131	A+PTR	mail.relee.com.hk
210.3.49.165	A	hy-pro.com.hk
210.3.50.18	A	www.nano-hk.net
210.3.50.18	A	mail.myrimis.com.hk
210.3.50.18	A	nano-hk.net
210.3.50.74	A+PTR	irongate.jaguarfreight.com.hk
210.3.50.122	A	agile-edm.com
210.3.50.122	A	agile-edm.com.cn
210.3.50.122	A	agilehk.com
210.3.50.130	A	mail2.burton.asia
210.3.51.81	PTR	ftp.eihkg.com.hk
210.3.51.81	PTR	pop3.eihkg.com.hk
210.3.51.81	PTR	smtp.eihkg.com.hk
210.3.51.183	A	dev1.funmobile.com