Robtex

Up: 103.15.40.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 103.15.40.0/24
Down right: 103.15.41.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
103.15.40.1	PTR	103.15.40.1-level3carrier.net
103.15.40.3	PTR	103.15.40.3-level3carrier.net
103.15.40.4	A+PTR	dns1.level3carrier.com
103.15.40.4	A+PTR	dns1.level3carrier.net
103.15.40.4	A	level3carrier.net
103.15.40.5	PTR	dns2.level3carrier.com
103.15.40.5	PTR	dns2.level3carrier.net
103.15.40.10	A+PTR	mail.level3carrier.net
103.15.40.10	PTR	mail.iconix.com.bd
103.15.40.10	A	mail.level3carrier.com
103.15.40.11	A+PTR	mrtg.level3carrier.com
103.15.40.150	A	level3carrier.net
103.15.41.66	A	ns1.level3carrier.com
103.15.41.209	PTR	103.15.41.209-level3carrier.net
103.15.41.209	A	scontent.fdac14-1.fna.fbcdn.net
103.15.41.210	PTR	103.15.41.210-level3carrier.net
103.15.41.210	A	video.fdac14-1.fna.fbcdn.net
103.15.41.218	A	gadgetstation.biz
103.15.41.222	A	sonar.fdac14-1.fna.fbcdn.net
103.15.41.224	A	z-p3-scontent.fdac14-1.fna.fbcdn.net
103.15.41.225	PTR	103.15.41.225-level3carrier.net
103.15.41.225	A	instagram.fdac14-1.fna.fbcdn.net
103.15.41.229	PTR	103.15.41.229-level3carrier.net