Robtex

Up: 182.75.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 182.75.80.0/23
Down right: 182.75.82.0/23

IP	Type	Hostname
182.75.80.16	PTR	nsg-static-16.80.75.182-airtel.com
182.75.80.48	PTR	nsg-static-48.80.75.182-airtel.com
182.75.80.49	PTR	nsg-static-49.80.75.182-airtel.com
182.75.80.50	PTR	nsg-static-50.80.75.182-airtel.com
182.75.80.51	PTR	nsg-static-51.80.75.182-airtel.com
182.75.80.206	PTR	nsg-static-206.80.75.182-airtel.com
182.75.81.168	PTR	nsg-static-168.81.75.182-airtel.com
182.75.81.206	PTR	nsg-static-206.81.75.182-airtel.com
182.75.82.234	PTR	nsg-static-234.82.75.182-airtel.com
182.75.83.2	PTR	nsg-static-2.83.75.182-airtel.com