Robtex

Up: 221.134.32.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 221.134.48.0/21
Down right: 221.134.56.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.134.52.0	PTR	221-134-52-0.sify.net
221.134.53.34	PTR	221-134-53-34.sify.net
221.134.53.255	PTR	221-134-53-255.sify.net
221.134.55.0	PTR	221-134-55-0.sify.net
221.134.55.255	PTR	221-134-55-255.sify.net
221.134.58.34	PTR	221-134-58-34.sify.net
221.134.60.0	PTR	221-134-60-0.sify.net
221.134.60.19	PTR	221-134-60-19.sify.net
221.134.60.19	A	standardsbis.in
221.134.60.34	PTR	221-134-60-34.sify.net
221.134.60.34	A	dodlaone.com
221.134.60.98	PTR	221-134-60-98.sify.net
221.134.60.98	A	ottabiz.com
221.134.60.136	A+PTR	mx.gmmcoindia.com
221.134.60.137	PTR	221-134-60-137.sify.net
221.134.60.137	A	mail1.gmmcoindia.com
221.134.60.137	A	gmmcoindia.com
221.134.60.138	PTR	221-134-60-138.sify.net
221.134.60.255	PTR	221-134-60-255.sify.net
221.134.62.0	PTR	221-134-62-0.sify.net
221.134.62.255	PTR	221-134-62-255.sify.net
221.134.63.0	PTR	221-134-63-0.sify.net