Robtex

Up: 121.7.192.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.7.192.0/23
Down right: 121.7.194.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.7.192.74	PTR	bb121-7-192-74.singnet.com.sg
121.7.192.171	A+PTR	bb121-7-192-171.singnet.com.sg
121.7.192.192	PTR	bb121-7-192-192.singnet.com.sg
121.7.192.207	A+PTR	bb121-7-192-207.singnet.com.sg
121.7.193.1	A	bb121-7-193-1.singnet.com.sg
121.7.193.2	A	bb121-7-193-2.singnet.com.sg
121.7.193.166	PTR	bb121-7-193-166.singnet.com.sg
121.7.194.5	A+PTR	bb121-7-194-5.singnet.com.sg
121.7.194.12	A+PTR	bb121-7-194-12.singnet.com.sg
121.7.194.71	A+PTR	bb121-7-194-71.singnet.com.sg
121.7.195.43	A	bb121-7-195-43.singnet.com.sg
121.7.195.48	A+PTR	bb121-7-195-48.singnet.com.sg
121.7.195.155	A+PTR	bb121-7-195-155.singnet.com.sg
121.7.195.242	A+PTR	bb121-7-195-242.singnet.com.sg
121.7.195.242	A	learntitude.com
121.7.195.242	A	sgoceanus.com