Robtex

Up: 121.200.248.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.200.252.0/23
Down right: 121.200.254.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.200.252.0	PTR	121-200-252-0.revdns.pacificinternet.com
121.200.252.89	PTR	mail.ptnw.co.id
121.200.252.89	A	smtp.ptnw.co.id
121.200.252.110	A	mail.capiotechnologies.com
121.200.252.131	PTR	peplinkwan1.daikin.com.sg
121.200.252.131	A	ns1.venus.daikin.com.sg
121.200.252.131	A	ns1.www.daikin.com.sg
121.200.252.165	PTR	mail1.raffles-shipbrokers.com.sg
121.200.252.165	A	raffles-shipbrokers.com.sg
121.200.252.166	A+PTR	mail1.raffles-shipmgt.com.sg
121.200.252.166	A	raffles-shipmgt.com.sg
121.200.252.167	A	raffles-shipping-intl.com.sg
121.200.252.255	PTR	121-200-252-255.revdns.pacificinternet.com
121.200.253.0	PTR	121-200-253-0.revdns.pacificinternet.com
121.200.253.8	A	mitutoyo.com.sg
121.200.253.10	A	email.mitutoyo.com.my
121.200.253.10	A	mailgw.mitutoyo.com.sg
121.200.253.10	A	mail.mitutoyo.co.id
121.200.253.11	PTR	vpn.mitutoyo.com.sg
121.200.253.255	PTR	121-200-253-255.revdns.pacificinternet.com
121.200.254.0	PTR	121-200-254-0.revdns.pacificinternet.com
121.200.254.6	PTR	w2.mynet.com.sg
121.200.254.6	A	elanlogistics.com
121.200.254.7	PTR	w1.mynet.com.sg
121.200.254.7	A	w2.mynet.com.sg
121.200.254.7	A	relianceglass.com.sg
121.200.254.12	A	axebrand.com.my
121.200.254.12	A	axebrand.com.sg
121.200.254.12	A	www.axebrand.com.sg
121.200.254.13	A	brookcrompton-ap.com
121.200.254.179	A+PTR	mail.cr5.sg
121.200.254.234	A	twp4.twpsin.com
121.200.254.236	A	twpsmtp.twpsin.com
121.200.254.238	A	www.psb-academy.edu.sg
121.200.254.243	A	psb-academy.edu.sg
121.200.254.255	PTR	121-200-254-255.revdns.pacificinternet.com
121.200.255.0	PTR	121-200-255-0.revdns.pacificinternet.com
121.200.255.105	A	tenchirfid.com
121.200.255.140	A	tokuapp.com
121.200.255.145	A	www.tokuapp.com
121.200.255.255	PTR	121-200-255-255.revdns.pacificinternet.com