Robtex

Up: 210.18.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 210.18.44.0/23
Down right: 210.18.46.0/23

IP	Type	Hostname
210.18.46.255	PTR	210.18.46.255.sify.net
210.18.47.0	PTR	210.18.47.0.sify.net
210.18.47.11	PTR	210.18.47.11.sify.net
210.18.47.12	A+PTR	210.18.47.12.sify.net
210.18.47.31	PTR	210.18.47.31.sify.net
210.18.47.32	A+PTR	210.18.47.32.sify.net
210.18.47.39	PTR	210.18.47.39.sify.net
210.18.47.63	PTR	210.18.47.63.sify.net
210.18.47.64	PTR	210.18.47.64.sify.net
210.18.47.75	PTR	210.18.47.75.sify.net
210.18.47.76	PTR	210.18.47.76.sify.net
210.18.47.79	PTR	210.18.47.79.sify.net
210.18.47.80	PTR	210.18.47.80.sify.net
210.18.47.87	PTR	210.18.47.87.sify.net
210.18.47.88	PTR	210.18.47.88.sify.net
210.18.47.91	PTR	210.18.47.91.sify.net
210.18.47.92	PTR	210.18.47.92.sify.net
210.18.47.119	PTR	210.18.47.119.sify.net
210.18.47.120	PTR	210.18.47.120.sify.net
210.18.47.127	PTR	210.18.47.127.sify.net
210.18.47.128	PTR	210.18.47.128.sify.net
210.18.47.234	A+PTR	210.18.47.234.sify.net