Robtex

Up: 103.99.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 103.99.36.0/23
Down right: 103.99.38.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
103.99.36.18	A+PTR	ns1.netzi.co.in
103.99.36.18	A	netzi.co.in
103.99.36.18	A	ns2.netzi.co.in
103.99.36.20	PTR	mail.prncom.com
103.99.36.20	A+PTR	mail.netzi.in
103.99.36.20	PTR	mail.obsolutions.in
103.99.38.197	PTR	netzi.in