Robtex

Up: 121.97.128.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.97.128.0/23
Down right: 121.97.130.0/23

IP	Type	Hostname
121.97.128.255	PTR	121.97.128.255.bti.net.ph
121.97.129.86	PTR	121.97.129.86.bti.net.ph
121.97.129.86	A	fwleg.aee.com.ph
121.97.129.122	PTR	121.97.129.122.bti.net.ph
121.97.130.166	A	ibsgvismin.com
121.97.130.167	A	ibsg2.ibsgvismin.com
121.97.131.78	PTR	121.97.131.78.bti.net.ph
121.97.131.124	PTR	121.97.131.124.bti.net.ph
121.97.131.140	PTR	121.97.131.140.bti.net.ph
121.97.131.251	PTR	lnx02.paec.net.ph