Robtex

Up: 121.7.160.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.7.160.0/23
Down right: 121.7.162.0/23

IP	Type	Hostname
121.7.160.19	PTR	bb121-7-160-19.singnet.com.sg
121.7.160.87	A+PTR	bb121-7-160-87.singnet.com.sg
121.7.160.122	PTR	bb121-7-160-122.singnet.com.sg
121.7.160.187	PTR	bb121-7-160-187.singnet.com.sg
121.7.161.142	A+PTR	bb121-7-161-142.singnet.com.sg
121.7.162.18	A	bb121-7-162-18.singnet.com.sg
121.7.162.20	A	smtp.kenputer.biz
121.7.162.20	A	*.kenputer.biz
121.7.162.182	PTR	bb121-7-162-182.singnet.com.sg
121.7.162.191	A	brompton.homedns.org
121.7.163.47	A+PTR	bb121-7-163-47.singnet.com.sg
121.7.163.153	A+PTR	bb121-7-163-153.singnet.com.sg