Robtex

Up: 203.144.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 203.144.64.0/20
Down right: 203.144.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.144.64.1	PTR	bdr.telesurf.com.kh
203.144.64.9	PTR	proxy.telesurf.com.kh
203.144.64.21	PTR	online.telesurf.com.kh
203.144.65.1	PTR	rt1.telesurf.com.kh
203.144.65.2	A+PTR	cns.telesurf.com.kh
203.144.65.2	A	cns3.telesurf.com.kh
203.144.65.2	A	dns1.telesurf.com.kh
203.144.65.3	PTR	ns.telesurf.com.kh
203.144.65.35	PTR	ftp.camgsm.com.kh
203.144.65.35	PTR	smtp2.everyday.com.kh
203.144.65.35	PTR	mail2.mobitel.com.kh
203.144.65.36	PTR	www.camgsm.com.kh
203.144.65.36	PTR	smtp.ctn.com.kh
203.144.65.36	PTR	smtp3.everyday.com.kh
203.144.65.37	PTR	smtp.telesurf.com.kh
203.144.65.37	A+PTR	terminal.telesurf.com.kh
203.144.65.38	PTR	fwout.mobitel.com.kh
203.144.65.66	PTR	mx1.everyday.com.kh
203.144.65.66	A	ftp.camgsm.com.kh
203.144.65.66	A	mx1.telesurf.com.kh
203.144.65.67	A	vpn1.camgsm.com.kh
203.144.65.68	PTR	smtp.ctn.com.kh
203.144.65.69	PTR	mail.cellcard.com.kh
203.144.65.69	A	mail.camgsm.com.kh
203.144.65.70	A	mx1.telesurf.com.kh
203.144.65.98	PTR	mail2.mobitel.com.kh
203.144.65.99	A+PTR	voice.mobitel.com.kh
203.144.65.100	PTR	www.mobitel.com.kh
203.144.65.101	PTR	broadcasting.mobitel.com.kh
203.144.65.102	A	project.mobitel.com.kh
203.144.65.104	A	tms2.mobitel.com.kh
203.144.65.105	A	wap.mobitel.com.kh
203.144.66.3	A+PTR	dns2.telesurf.com.kh
203.144.66.3	A	ns.telesurf.com.kh
203.144.66.3	A	rdns.telesurf.com.kh
203.144.66.70	PTR	www.fhi.org.kh
203.144.66.77	PTR	www.pwc.com.kh
203.144.66.195	A+PTR	cenat.everyday.com.kh
203.144.67.237	PTR	www.phatbun.per.kh
203.144.67.237	A	mail.phatbun.per.kh
203.144.68.5	PTR	mail.cbl.com.kh
203.144.68.206	PTR	mag.org.kh
203.144.71.75	PTR	sokhahotels.com
203.144.72.147	A	natbankcam.org
203.144.75.14	PTR	proxy.telesurf.com.kh
203.144.78.2	PTR	speedcast.telesurf.com.kh
203.144.78.14	A	proxy.telesurf.com.kh
203.144.78.147	PTR	helenjarvis.com.kh
203.144.78.248	PTR	mail.camlot.com.kh
203.144.79.2	PTR	dial-2.everyday.com.kh
203.144.79.99	PTR	dial.everyday.com.kh
203.144.79.107	A	dial.everyday.com.kh
203.144.79.128	PTR	dial-128.everyday.com.kh
203.144.79.162	PTR	dial-162.everyday.com.kh
203.144.79.163	PTR	dial-163.everyday.com.kh
203.144.80.1	PTR	rtr.telesurf.com.kh
203.144.81.1	PTR	rtr.telesurf.com.kh
203.144.82.1	PTR	rtr.telesurf.com.kh
203.144.83.1	PTR	rtr.telesurf.com.kh
203.144.84.1	PTR	rtr.telesurf.com.kh
203.144.85.1	PTR	rtr.telesurf.com.kh
203.144.86.1	PTR	rtr.telesurf.com.kh
203.144.87.1	PTR	rtr.telesurf.com.kh
203.144.88.1	PTR	rtr.telesurf.com.kh
203.144.89.1	PTR	rtr.telesurf.com.kh
203.144.89.81	A	scontent.fpnh9-2.fna.fbcdn.net
203.144.89.82	A	video.fpnh9-2.fna.fbcdn.net
203.144.89.96	A	z-p3-scontent.fpnh9-2.fna.fbcdn.net
203.144.89.97	A	instagram.fpnh9-2.fna.fbcdn.net
203.144.89.98	A	media.fpnh9-2.fna.whatsapp.net
203.144.90.34	PTR	mx2.camgsm.com.kh
203.144.91.1	PTR	rtr.telesurf.com.kh
203.144.91.2	A+PTR	mx2.camgsm.com.kh
203.144.91.3	A+PTR	mx1.everyday.com.kh
203.144.91.3	A	mx1.mobitel.com.kh
203.144.91.3	A	smtp.everyday.com.kh
203.144.91.44	A	r1.sn-j5hbnh-2oie.googlevideo.com
203.144.91.81	A	scontent.fpnh9-1.fna.fbcdn.net
203.144.91.82	A	video.fpnh9-1.fna.fbcdn.net
203.144.91.96	A	z-p3-scontent.fpnh9-1.fna.fbcdn.net
203.144.91.97	A	instagram.fpnh9-1.fna.fbcdn.net
203.144.91.98	A	media.fpnh9-1.fna.whatsapp.net
203.144.91.140	A	r1.sn-j5hbnh-2oil.googlevideo.com
203.144.91.143	A	r4.sn-j5hbnh-2oil.googlevideo.com
203.144.91.144	A	r5.sn-j5hbnh-2oil.googlevideo.com
203.144.91.145	A	r6.sn-j5hbnh-2oil.googlevideo.com
203.144.92.1	PTR	rtr.telesurf.com.kh
203.144.93.1	PTR	rtr.telesurf.com.kh
203.144.93.188	A	youneversad.com
203.144.94.1	PTR	rtr.telesurf.com.kh
203.144.95.1	PTR	rtr.telesurf.com.kh
203.144.95.4	PTR	www.mytv.com.kh
203.144.95.5	PTR	gprs.mobitel.com.kh
203.144.95.6	PTR	gprs.mobitel.com.kh
203.144.95.98	A+PTR	mms.mobitel.com.kh
203.144.95.98	A	mms.cellcard.com.kh
203.144.95.99	PTR	apache.cellcard.com.kh
203.144.95.100	A+PTR	wapgw.mobitel.com.kh
203.144.95.146	PTR	gprs.mobitel.com.kh
203.144.95.147	PTR	gprs.mobitel.com.kh
203.144.95.148	PTR	gprs.mobitel.com.kh
203.144.95.149	PTR	gprs.mobitel.com.kh
203.144.95.188	A	youneversad.com