Robtex

Up: 203.121.160.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.121.164.0/23
Down right: 203.121.166.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.121.164.77	A	mail.tlicarecenter.com
203.121.164.88	A	www.tlicarecenter.com
203.121.164.195	PTR	mail.tipco.net
203.121.164.250	PTR	mail.cyber-lock.com
203.121.165.2	A	3forfun.com
203.121.165.2	A	www.tv3mobile.com
203.121.165.2	A	xn--82ce6ap6ajgic2e8a9c9a6c4fhd2sh.com
203.121.165.7	A+PTR	mail.thanachart.co.th
203.121.165.16	A	game.tuk-tuk.com
203.121.165.16	A	tuk-tuk.com
203.121.165.16	A	twoplusonline.com
203.121.165.130	A	ns2.vingworld.tv
203.121.165.144	A	*.vingtv.com
203.121.166.2	PTR	pool-isdn-2.microthai.com
203.121.166.10	PTR	pool-isdn-10.microthai.com
203.121.166.19	PTR	pool-isdn-19.microthai.com
203.121.166.32	PTR	pool-isdn-32.microthai.com
203.121.166.70	PTR	pool-isdn-70.microthai.com
203.121.166.71	PTR	pool-isdn-71.microthai.com
203.121.166.73	PTR	pool-isdn-73.microthai.com
203.121.166.74	PTR	pool-isdn-74.microthai.com
203.121.166.76	PTR	pool-isdn-76.microthai.com
203.121.166.98	PTR	pool-isdn-98.microthai.com
203.121.166.105	PTR	pool-isdn-105.microthai.com
203.121.166.111	PTR	pool-isdn-111.microthai.com
203.121.166.115	PTR	pool-isdn-115.microthai.com
203.121.166.159	PTR	pool-isdn-159.microthai.com
203.121.166.168	PTR	pool-isdn-168.microthai.com
203.121.166.173	PTR	pool-isdn-173.microthai.com
203.121.166.211	PTR	pool-isdn-211.microthai.com
203.121.166.232	PTR	pool-isdn-232.microthai.com
203.121.166.237	PTR	pool-isdn-237.microthai.com
203.121.166.241	PTR	pool-isdn-241.microthai.com
203.121.166.250	PTR	pool-isdn-250.microthai.com
203.121.167.131	PTR	mx2.cpf.co.th
203.121.167.131	PTR	smtp.cpf.co.th
203.121.167.132	PTR	mail.cpf.co.th
203.121.167.202	PTR	mail.bkp.co.th
203.121.167.219	A	yourcp.com
203.121.167.219	A	cpfreshmartclub.com
203.121.167.235	PTR	smtp3.cpf.co.th
203.121.167.253	A	pacific.cpf-it.com
203.121.167.253	A	pi.cpconsumer.com
203.121.167.253	A	pi.fightingcockthailand.com