As you want to know about rank structure of Indian Navy here can you please get some information here I will get details for you.

The Indian Navy is the naval branch of the Indian Armed Forces is the fifth largest in the world which played an important role in India's victory in the 1971 Indo-Pakistani War.

Here is the rank structure
Admiral of the Fleet
Admiral
Vice Admiral
Rear Admiral
Commodore
Captain
Commander
Lieutenant Commander
Lieutenant
Sublieutenant

Fleet
2 aircraft carriers
1 amphibious transport dock
9 landing ship tanks
10 destroyers
14 frigates
24 corvettes
6 mine countermeasure vessels
14 submarines
25 patrol vessels
4 replenishment oilers

Address:-
Indian Navy
JDMPR (OI & R)
Room No 205, C Wing
Sena Bhawan, New Delhi -110011

Phone:-
011-23010151