Robtex

Up: 121.6.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.6.48.0/23
Down right: 121.6.50.0/23

IP	Type	Hostname
121.6.48.79	PTR	bb121-6-48-79.singnet.com.sg
121.6.48.208	PTR	bb121-6-48-208.singnet.com.sg
121.6.49.3	A+PTR	bb121-6-49-3.singnet.com.sg
121.6.49.6	A+PTR	bb121-6-49-6.singnet.com.sg
121.6.49.13	A+PTR	bb121-6-49-13.singnet.com.sg
121.6.49.62	A+PTR	bb121-6-49-62.singnet.com.sg
121.6.49.78	PTR	bb121-6-49-78.singnet.com.sg
121.6.49.85	PTR	bb121-6-49-85.singnet.com.sg
121.6.49.105	A+PTR	bb121-6-49-105.singnet.com.sg
121.6.49.129	PTR	bb121-6-49-129.singnet.com.sg
121.6.49.130	A+PTR	bb121-6-49-130.singnet.com.sg
121.6.49.149	PTR	bb121-6-49-149.singnet.com.sg
121.6.49.169	A+PTR	bb121-6-49-169.singnet.com.sg
121.6.49.171	A+PTR	bb121-6-49-171.singnet.com.sg
121.6.49.172	A+PTR	bb121-6-49-172.singnet.com.sg
121.6.49.187	A	kokthian68.net
121.6.49.187	A	mail.kokthian68.net
121.6.49.190	A+PTR	bb121-6-49-190.singnet.com.sg
121.6.49.235	PTR	bb121-6-49-235.singnet.com.sg
121.6.49.240	A+PTR	bb121-6-49-240.singnet.com.sg
121.6.49.241	A+PTR	bb121-6-49-241.singnet.com.sg
121.6.49.247	A+PTR	bb121-6-49-247.singnet.com.sg
121.6.50.96	A+PTR	bb121-6-50-96.singnet.com.sg
121.6.50.159	PTR	bb121-6-50-159.singnet.com.sg
121.6.51.5	A+PTR	bb121-6-51-5.singnet.com.sg
121.6.51.42	A+PTR	bb121-6-51-42.singnet.com.sg
121.6.51.72	A+PTR	bb121-6-51-72.singnet.com.sg
121.6.51.96	PTR	bb121-6-51-96.singnet.com.sg