Robtex

Up: 121.7.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.7.20.0/23
Down right: 121.7.22.0/23

IP	Type	Hostname
121.7.20.2	A+PTR	bb121-7-20-2.singnet.com.sg
121.7.20.19	A	necronox.com
121.7.20.90	A+PTR	bb121-7-20-90.singnet.com.sg
121.7.21.8	A+PTR	bb121-7-21-8.singnet.com.sg
121.7.21.18	A+PTR	bb121-7-21-18.singnet.com.sg
121.7.21.149	A+PTR	bb121-7-21-149.singnet.com.sg
121.7.21.157	A+PTR	bb121-7-21-157.singnet.com.sg
121.7.21.193	PTR	bb121-7-21-193.singnet.com.sg
121.7.23.2	A+PTR	bb121-7-23-2.singnet.com.sg
121.7.23.38	PTR	bb121-7-23-38.singnet.com.sg
121.7.23.38	A	pavlito.org
121.7.23.192	A+PTR	bb121-7-23-192.singnet.com.sg