Robtex

Up: 123.63.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.63.32.0/23
Down right: 123.63.34.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.63.32.194	PTR	ns1-group.com
123.63.32.195	PTR	ns1-group.com
123.63.32.195	A	mx.nslindia.com
123.63.32.195	A	mx2.constello.in
123.63.32.196	PTR	ns1-group.com
123.63.32.196	A	mail.nslindia.com
123.63.32.197	PTR	ns1-group.com
123.63.32.197	A	mail.nuziveeduseeds.com
123.63.32.197	A	mail.fhslindia.com
123.63.32.198	PTR	ns1-group.com
123.63.32.199	PTR	ns1-group.com
123.63.32.200	PTR	ns1-group.com
123.63.32.200	A	nuziveeduseeds.com
123.63.32.200	A	nslpower.com
123.63.32.201	PTR	ns1-group.com
123.63.32.202	PTR	ns1-group.com
123.63.32.203	PTR	ns1-group.com
123.63.32.204	PTR	ns1-group.com
123.63.32.205	PTR	ns1-group.com
123.63.32.206	PTR	ns1-group.com
123.63.32.207	PTR	ns1-group.com
123.63.32.208	PTR	ns1-group.com
123.63.32.209	PTR	ns1-group.com
123.63.32.210	PTR	ns1-group.com
123.63.32.211	PTR	ns1-group.com
123.63.32.212	PTR	ns1-group.com
123.63.32.213	PTR	ns1-group.com
123.63.32.214	PTR	ns1-group.com
123.63.32.215	PTR	ns1-group.com
123.63.32.216	PTR	ns1-group.com
123.63.32.217	PTR	ns1-group.com
123.63.32.218	PTR	ns1-group.com
123.63.32.219	PTR	ns1-group.com
123.63.32.220	PTR	ns1-group.com
123.63.32.221	PTR	ns1-group.com
123.63.32.222	PTR	ns1-group.com
123.63.32.223	PTR	ns1-group.com
123.63.33.43	A	tensms.com
123.63.33.43	A	www.pinnacleteleservices.com
123.63.33.43	A	smsnagpur.com
123.63.33.44	A	sms.valueleaf.com
123.63.33.44	A	varunjalan.com
123.63.34.187	A	inc.viraj.com
123.63.34.189	A+PTR	mx2.viraj.com
123.63.34.252	A+PTR	mail.sintercom.co.in
123.63.34.252	A	mx2.sintercom.co.in
123.63.35.38	A	mail.heritagefoods.co.in
123.63.35.38	A	heritagedairy.co.in
123.63.35.202	A	ns3.heterogroup.com
123.63.35.213	A	webmail.nccltd.in