Robtex

Up: 221.135.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 221.135.0.0/18
Down right: 221.135.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.135.0.1	PTR	221-135-0-1.sify.net
221.135.3.3	PTR	221-135-3-3.sify.net
221.135.3.128	PTR	221-135-3-128.sify.net
221.135.4.2	PTR	221-135-4-2.sify.net
221.135.4.3	PTR	221-135-4-3.sify.net
221.135.9.2	PTR	221-135-9-2.sify.net
221.135.9.3	PTR	221-135-9-3.sify.net
221.135.9.128	PTR	221-135-9-128.sify.net
221.135.12.0	PTR	221-135-12-0.sify.net
221.135.13.1	PTR	221-135-13-1.sify.net
221.135.13.131	PTR	221-135-13-131.sify.net
221.135.25.2	PTR	221-135-25-2.sify.net
221.135.25.114	A	sundaramhydraulics.in
221.135.25.117	A	wheelsindia.in
221.135.35.2	A	scsinfinity.com
221.135.35.46	PTR	221-135-35-46.sify.net
221.135.35.173	PTR	221-135-35-173.sify.net
221.135.35.173	A	buddy.hdfcergo.com
221.135.35.174	PTR	221-135-35-174.sify.net
221.135.36.255	PTR	221-135-36-255.sify.net
221.135.38.78	PTR	221-135-38-78.sify.net
221.135.38.78	A	permacel.in
221.135.38.255	PTR	221-135-38-255.sify.net
221.135.39.1	PTR	221-135-39-1.sify.net
221.135.39.1	A	www.asbi.co.in
221.135.39.1	A	*.asbi.co.in
221.135.39.146	PTR	221-135-39-146.sify.net
221.135.39.146	A	gharkharido.com
221.135.39.146	A	stupidengineer.com
221.135.45.50	A	askanantara.com
221.135.45.51	A	a4-health.com
221.135.45.61	A	a4-health.com
221.135.45.155	A	pmail1.kvbmail.com
221.135.45.155	A	mail.kvbmail.com
221.135.45.177	A	kvbin.com
221.135.45.177	A	www.kvbin.com
221.135.46.100	A	rndsoftech.co.in
221.135.51.170	A	mail.repcohome.com
221.135.51.196	A	mail.himalayahealthcare.com
221.135.51.225	A	sanexchange.sanseraindia.com
221.135.54.90	A	abeomix.com
221.135.54.201	A	cclvts.com
221.135.56.3	PTR	221-135-56-3.sify.net
221.135.56.6	A	www.smobility.in
221.135.56.6	A	smobility.in
221.135.56.12	A	mail2.spicedigital.in
221.135.56.12	A	mail1.spicedigital.in
221.135.56.128	PTR	221-135-56-128.sify.net
221.135.57.0	PTR	221-135-57-0.sify.net
221.135.57.3	PTR	221-135-57-3.sify.net
221.135.57.130	PTR	221-135-57-130.sify.net
221.135.62.33	A	mx.smartinvestor.in
221.135.62.33	A	mx1.bsmail.in
221.135.62.33	A	bs.bsmail.in
221.135.62.128	PTR	221-135-62-128.sify.net
221.135.68.51	A	zhuosu56.com
221.135.78.0	PTR	221-135-78-0.sify.net
221.135.78.1	PTR	221-135-78-1.sify.net
221.135.78.131	PTR	221-135-78-131.sify.net
221.135.82.0	PTR	221-135-82-0.sify.net
221.135.83.255	PTR	221-135-83-255.sify.net
221.135.84.34	PTR	221-135-84-34.sify.net
221.135.84.106	PTR	www.spykarmails.com
221.135.84.150	PTR	221-135-84-150.sify.net
221.135.84.164	A	alric-zx.spectrum-india.com
221.135.84.164	A	spectrum-x.spectrum-india.com
221.135.91.2	PTR	221-135-91-2.sify.net
221.135.94.1	PTR	221-135-94-1.sify.net
221.135.94.2	PTR	221-135-94-2.sify.net
221.135.94.129	PTR	221-135-94-129.sify.net
221.135.94.130	PTR	221-135-94-130.sify.net
221.135.97.0	PTR	221-135-97-0.sify.net
221.135.97.130	PTR	221-135-97-130.sify.net
221.135.99.1	PTR	221-135-99-1.sify.net
221.135.101.2	PTR	221-135-101-2.sify.net
221.135.101.129	PTR	221-135-101-129.sify.net
221.135.102.2	A	mx2.sify.com
221.135.102.3	A	sifymx1.sify.net
221.135.102.4	A	sifymx2.sify.net
221.135.102.5	A+PTR	sifymx3.sify.net
221.135.102.200	A	uatdemo1.sify.net
221.135.102.201	A	uatdemo2.sify.net
221.135.103.66	A	sifymumgslb.sify.net
221.135.104.112	PTR	221-135-104-112.sify.net
221.135.111.1	PTR	221-135-111-1.sify.net
221.135.111.178	A	sifygslb.sify.net
221.135.119.0	PTR	221-135-119-0.sify.net
221.135.120.100	PTR	221-135-120-100.sify.net
221.135.122.136	A	mail.takesolutions.net
221.135.122.137	A	takesolutions.net
221.135.122.145	A	mail.takesolutions.com
221.135.122.170	A	distribution.shriram
221.135.123.3	PTR	221-135-123-3.sify.net
221.135.123.128	PTR	221-135-123-128.sify.net
221.135.123.129	PTR	221-135-123-129.sify.net
221.135.126.0	PTR	221-135-126-0.sify.net
221.135.126.254	PTR	221-135-126-254.sify.net