It appears that the Indian Navy does not allocate a certain type of vessel to a particular unit. Rather, different vessel types are assigned to units as they are commissioned and the units often switch to very different vessel types from what they might been equipped with originally. For instance, the 22nd Missile Vessel Squadron currently equipped with Tarantul-I Class corvettes may have been the former 22nd Destroyer Squadron and the 31st Patrol Vessel Squadron currently equipped with Petya-II Class frigates may be the former 31st MCM Squadron. Also note that some squadron numbers are not sequential and often repeat themselves, albeit with different vessel types - such as the 21 Missile Vessel Squadron and 21 MCM Squadron.

There appears to be a pattern with the submarine squadron numbers. For instance, the 12th Submarine Squadron could have been the former 12th Frigate Squadron or raised as a new unit, sequentially following the 8th, 9th, 10th and 11th Submarine Squadrons. There are some indications that the Indian Navy has now done away with squadron organizations for most combat units, except for submarines, missile boats and minesweepers. Instead, the Indian Navy has opted for combined task groups. Missile boat squadrons are organized into divisions of four or fewer units. For instance, the 25 Killer Squadron has the 251 Division, 252 Division, 253 Division and so on. Likewise the 22 Killer Squadron has the 221 Division, 222 Division and so on. Please note that although the information currently listed on this page has been identified in print, squadron numbers and vessel types could change. Currently active units are listed separately from other units.

Currently Active Units:

• 1st Training Squadron - Tir, Krishna, Tarangini, Varuna and others. Based at Cochin.

• 5th Landing Ship Squadron - With 2nd batch of four Polnochny Class amphibious warfare vessels. Based at Port Blair.

• 8th Submarine Squadron - Foxtrot Class submarines with the Eastern Fleet at Vizag.

• 10th Submarine Squadron - Type 1500 Class submarines with the Western Fleet at Mumbai.

• 11th Submarine Squadron - Kilo Class submarines with the Eastern Fleet at Vizag.

• 12th Submarine Squadron - Kilo Class submarines (Sindhurakshak, Sindhushastra, Sindhukirti + others) with the Western Fleet at Mumbai.

• 14th Frigate Squadron - Nilgiri (Leander) Class frigates with the Eastern Fleet at Vizag.

• 19th MCM Squadron - 1st batch of SMN (Natya) Class with the Western Fleet at Mumbai.

• 20th MCM Squadron - Mahé (Yevgenya) Class minesweepers, based at Cochin.

• 21st MCM Squadron (M21) - 2nd batch of Pondicherry (Natya) Class vessels with the Eastern Fleet at Vizag.

• 21st Missile Vessel Squadron (K21) - Durg (Nanuchka) Class corvettes with the Western Fleet at Mumbai.

• 22nd Missile Vessel Squadron (K22) - Veer (Tarantul-I) Class corvettes with the Western Fleet at Mumbai and possibly with the Eastern Fleet.

• 23 Patrol Vessel Squadron (P23) - Abhay (1241PE) Class corvettes with the Western Fleet at Mumbai.

• 25th Missile Vessel Squadron (K25) - Osa-II Class fast-attack missile boats.

• 31st Patrol Vessel (Black Panthers) Squadron - Petya-II Class frigates with the Eastern Fleet at Vizag.

These may not all be currently active and reflect historical information.

• 4th Amphibious Squadron - 1st batch of Polnochny Class vessels incl. Ghorpad, Kesari which have now been decommissioned.

• 6th MCM Squadron - Possibly equipped with Natya Class vessels.

• 9th Submarine Squadron - Possibly with Foxtrot Class submarines, based at Bombay.

• 15th Frigate Squadron - Formerly equipped with Type 12 frigates, the old Talwar & Trishul.

• 16th Frigate Squadron - Formerly equipped with Type 41 frigates, the old Beas, Betwa & Brahmaputra.

• 17th Frigate Squadron - Equipped with Leander Class vessels.

• 32 Patrol Vessel Squadron - Used to be with Petya-II Class frigates.

• 149 MCM Squadron - Used to be equipped with Ton Class vessels.

• 239 MCM Squadron - Used to be equipped with Ham Class vessels.

• 321st Sea/Land Patrol Squadron.

• 322nd SDB Squadron.

• 324 SDB Squadron.