Robtex

Up: 182.72.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 182.72.20.0/23
Down right: 182.72.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
182.72.20.6	A	aptira.co.in
182.72.20.20	PTR	nsg-static-020.20.72.182.airtel.in
182.72.20.63	PTR	nsg-static-063.20.72.182.airtel.in
182.72.20.80	PTR	nsg-static-080.20.72.182.airtel.in
182.72.20.88	PTR	nsg-static-088.20.72.182.airtel.in
182.72.20.95	PTR	nsg-static-095.20.72.182.airtel.in
182.72.20.187	A	exchange.ishisystems.com
182.72.20.187	A	mail1.ishisystems.com
182.72.20.218	A	fundraiseez.com
182.72.20.219	A	npemigration.com
182.72.20.224	PTR	nsg-static-224.20.72.182.airtel.in
182.72.21.17	PTR	nsg-static-017.21.72.182.airtel.in
182.72.21.178	PTR	hkindia.com
182.72.21.178	PTR	markpatent.org
182.72.21.220	PTR	nsg-static-220.21.72.182.airtel.in
182.72.22.40	A	zvaro.com
182.72.22.145	PTR	intellicon.in
182.72.22.145	PTR	mailserver.intellicon.in
182.72.22.145	A	intelliwms.in
182.72.22.146	PTR	ns1.intellicon.in
182.72.22.147	PTR	ns2.intellicon.in
182.72.22.158	PTR	mailserver.intellicon.in
182.72.23.33	A+PTR	kclserver1.kclindia.com
182.72.23.33	PTR	nsg-static-033.23.72.182.airtel.in
182.72.23.33	A	mail.kclindia.com
182.72.23.85	PTR	nsg-static-085.23.72.182.airtel.in
182.72.23.85	A	mx02.amgindia.com
182.72.23.85	A	mx01.amgindia.com