Robtex

Up: 203.101.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.101.4.0/23
Down right: 203.101.6.0/23

IP	Type	Hostname
203.101.5.181	PTR	dsl.delhi.181.5.101.203.airtelbroadband.in
203.101.5.196	PTR	dsl.delhi.196.5.101.203.airtelbroadband.in
203.101.5.201	PTR	dsl.delhi.201.5.101.203.airtelbroadband.in
203.101.5.254	PTR	dsl.delhi.254.5.101.203.airtelbroadband.in