Robtex

Up: 14.139.192.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 14.139.193.0/25
Down right: 14.139.193.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
14.139.193.10	PTR	gate.saha.ac.in
14.139.193.10	PTR	mail.saha.ac.in
14.139.193.10	PTR	mx2.saha.ac.in
14.139.193.250	PTR	mx3.saha.ac.in
14.139.193.250	PTR	ns2.saha.ac.in
14.139.193.250	PTR	mx3.saha.ernet.in