Robtex

Up: 121.52.128.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.52.136.0/22
Down right: 121.52.140.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.52.136.11	A	smtp.idpelangi.com
121.52.136.11	A	mail.salma-na.com
121.52.136.11	A	mail.dino.my.id
121.52.141.127	A	www.o-stop.com
121.52.142.136	A	mail.harrysatrya.com
121.52.142.136	A	harrysatrya.com