Robtex

Up: 121.7.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.7.4.0/23
Down right: 121.7.6.0/23

IP	Type	Hostname
121.7.4.2	A+PTR	bb121-7-4-2.singnet.com.sg
121.7.4.19	PTR	bb121-7-4-19.singnet.com.sg
121.7.4.39	PTR	bb121-7-4-39.singnet.com.sg
121.7.4.87	A+PTR	bb121-7-4-87.singnet.com.sg
121.7.4.135	PTR	bb121-7-4-135.singnet.com.sg
121.7.4.210	A+PTR	bb121-7-4-210.singnet.com.sg
121.7.5.2	A+PTR	bb121-7-5-2.singnet.com.sg
121.7.5.48	A+PTR	bb121-7-5-48.singnet.com.sg
121.7.5.77	A	bb121-7-5-77.singnet.com.sg
121.7.5.101	A+PTR	bb121-7-5-101.singnet.com.sg
121.7.5.110	A+PTR	bb121-7-5-110.singnet.com.sg
121.7.5.120	PTR	bb121-7-5-120.singnet.com.sg
121.7.5.120	A	www.nicam.com.sg
121.7.5.172	PTR	bb121-7-5-172.singnet.com.sg
121.7.5.205	A	nicams.dyndns.org
121.7.5.222	A	bb121-7-5-222.singnet.com.sg
121.7.6.2	A+PTR	bb121-7-6-2.singnet.com.sg
121.7.6.23	A	bb121-7-6-23.singnet.com.sg
121.7.7.5	A+PTR	bb121-7-7-5.singnet.com.sg
121.7.7.99	A+PTR	bb121-7-7-99.singnet.com.sg