Robtex

Up: 110.139.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 110.139.12.0/23
Down right: 110.139.14.0/23

IP	Type	Hostname
110.139.12.2	PTR	2.subnet110-139-12.speedy.telkom.net.id
110.139.12.30	PTR	30.subnet110-139-12.speedy.telkom.net.id
110.139.12.93	PTR	93.subnet110-139-12.speedy.telkom.net.id
110.139.12.94	PTR	94.subnet110-139-12.speedy.telkom.net.id
110.139.12.94	A	mail.pakerin.co.id
110.139.13.30	PTR	30.subnet110-139-13.speedy.telkom.net.id
110.139.13.63	PTR	63.subnet110-139-13.speedy.telkom.net.id
110.139.13.121	PTR	121.subnet110-139-13.speedy.telkom.net.id
110.139.13.147	PTR	147.subnet110-139-13.speedy.telkom.net.id
110.139.13.147	A+PTR	mail.ptkdi.com
110.139.13.179	PTR	179.subnet110-139-13.speedy.telkom.net.id
110.139.13.190	PTR	190.subnet110-139-13.speedy.telkom.net.id
110.139.13.190	A	dufotindo.com
110.139.13.203	PTR	203.subnet110-139-13.speedy.telkom.net.id
110.139.13.220	PTR	220.subnet110-139-13.speedy.telkom.net.id
110.139.13.246	PTR	246.subnet110-139-13.speedy.telkom.net.id
110.139.14.11	PTR	11.subnet110-139-14.speedy.telkom.net.id
110.139.14.178	PTR	178.subnet110-139-14.speedy.telkom.net.id
110.139.14.240	PTR	240.subnet110-139-14.speedy.telkom.net.id
110.139.14.244	PTR	244.subnet110-139-14.speedy.telkom.net.id
110.139.14.252	PTR	252.subnet110-139-14.speedy.telkom.net.id
110.139.15.4	PTR	4.subnet110-139-15.speedy.telkom.net.id
110.139.15.98	PTR	98.subnet110-139-15.speedy.telkom.net.id
110.139.15.130	PTR	130.subnet110-139-15.speedy.telkom.net.id
110.139.15.236	PTR	236.subnet110-139-15.speedy.telkom.net.id
110.139.15.245	PTR	245.subnet110-139-15.speedy.telkom.net.id
110.139.15.246	PTR	246.subnet110-139-15.speedy.telkom.net.id