Robtex

Up: 203.144.88.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.144.88.0/23
Down right: 203.144.90.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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
203.144.91.4	A	www.camgsm.com.kh
203.144.91.4	A	pop3.everyday.com.kh
203.144.91.4	A	mail.mobitel.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