Robtex

Up: 121.1.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.1.56.0/22
Down right: 121.1.60.0/22

IP	Type	Hostname
121.1.56.22	A+PTR	surftv.smartbro.net
121.1.56.22	A+PTR	wimax.smartbro.net
121.1.56.23	A	ibroext1.smart.com.ph
121.1.57.102	A	acl1-298bts.gw.smartbro.net
121.1.58.30	A	acl1-319bts.gw.smartbro.net
121.1.58.110	A	acl1-313bts.gw.smartbro.net
121.1.59.130	PTR	mail1.sumitronics-phils.com
121.1.61.203	A	acl1-339bts.gw.smartbro.net
121.1.63.38	A	acl1-345bts.gw.smartbro.net