Robtex

Up: 121.243.104.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 121.243.104.0/24
Down right: 121.243.105.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.243.105.1	PTR	121.243.105.1.static-kolkata.vsnl.net.in
121.243.105.25	PTR	121.243.105.25.static-kolkata.vsnl.net.in
121.243.105.32	PTR	121.243.105.32.static-kolkata.vsnl.net.in
121.243.105.80	PTR	121.243.105.80.static-kolkata.vsnl.net.in
121.243.105.83	PTR	121.243.105.83.static-kolkata.vsnl.net.in
121.243.105.91	PTR	121.243.105.91.static-kolkata.vsnl.net.in
121.243.105.103	PTR	121.243.105.103.static-kolkata.vsnl.net.in
121.243.105.121	PTR	121.243.105.121.static-kolkata.vsnl.net.in
121.243.105.127	PTR	121.243.105.127.static-kolkata.vsnl.net.in
121.243.105.132	A+PTR	mail.viacom18.com
121.243.105.136	PTR	121.243.105.136.static-kolkata.vsnl.net.in
121.243.105.136	A	mumhtcas1.viacom18.com
121.243.105.136	A	mail.viacom-18.com
121.243.105.137	PTR	mumhtcas1.viacom18.com
121.243.105.137	A	mumhtcas2.viacom18.com
121.243.105.145	A+PTR	mail1.viacom18.com
121.243.105.146	PTR	121.243.105.146.static-kolkata.vsnl.net.in
121.243.105.152	PTR	121.243.105.152.static-kolkata.vsnl.net.in
121.243.105.157	PTR	121.243.105.157.static-kolkata.vsnl.net.in
121.243.105.158	PTR	121.243.105.158.static-kolkata.vsnl.net.in
121.243.105.165	PTR	121.243.105.165.static-kolkata.vsnl.net.in
121.243.105.196	PTR	121.243.105.196.static-kolkata.vsnl.net.in
121.243.105.212	PTR	ns2.gkbhitech.com
121.243.105.220	PTR	ns1.gkbhitech.com
121.243.105.229	PTR	121.243.105.229.static-kolkata.vsnl.net.in
121.243.105.234	PTR	121.243.105.234.static-kolkata.vsnl.net.in
121.243.105.236	PTR	121.243.105.236.static-kolkata.vsnl.net.in
121.243.105.236	A	www.ltferp.com
121.243.105.236	A	ltferp.com