# List of unclassified miscellaneous vessels of the United States Navy

The IX (unclassified–miscellaneous) hull classification symbol is used for ships of the United States Navy that do not fit into one of the standard categories. Similar lists of 'miscellaneous' ships can found at
    List of auxiliaries of the United States Navy § Miscellaneous ships (AG, T-AG)
and
    List of yard and district craft of the United States Navy § District auxiliary, miscellaneous (YAG).
Ship status is indicated as either currently active [A] (including ready reserve), inactive [I], or precommissioning [P]. Ships in the inactive category include only ships in the inactive reserve, ships which have been disposed from US service have no listed status. Ships in the precommissioning category include ships under construction or on order; IX ships are generally not ordered as such, but are rather converted from other roles.

## Historical overview

These vessels usually fall into these categories:
* Armed decoys (Q-ships)
* Experimental vessels
* Former yachts
* Mobile base vessels used by service squadrons (command ships, barracks ships, bulk storage ships, unnamed barges, and floating shipyard equipment)
* Retired warships
* Training equipment and simulators (including two Great Lakes-based paddlewheel aircraft carriers)
* War prizes
Currently only one ship, USS Prevail (IX-537), actively carries an IX hull symbol.

### World War II

See also
    List of United States Navy amphibious warfare ships § World War II
    List of auxiliaries of the United States Navy § World War II
During the naval build-up for World War II at least 45 vessels of Maritime Commission (MarCom, later MarAd) standard designs were converted to US Navy unclassified miscellaneous vessels (several after suffering heavy damage in commercial service):
* 12 Type EC2 Liberty ships (3 later classed as auxiliaries)
* 20 Type Z-ET1 Liberty ships (2 later classed as auxiliaries)
* 13 Type B7-D1 concrete barges

## Unclassified miscellaneous vessels (IX)

* Annapolis (IX-1), ex-PG-10
* Dispatch (IX-2), ex-Boston, protected cruiser
* Briarcliff (IX-3), receiving ship
* Cheyenne (IX-4), ex-BM-10
* Alton (IX-5), ex-CA-14, ex-CL-14
* Coastal Battleship Number 4 (IX-6), ex-BB-4
* Commodore (IX-7), receiving ship, armory
* Cumberland (IX-8), receiving ship
* Dubuque (IX-9), ex-AG-6, later PG-17
* Essex (IX-10), ex-sloop of war, receiving ship
* Gopher (IX-11), ex-Fern, training ship, sank while under tow 21 September 1923
* Hancock (IX-12), ex-AP-3, receiving ship
* Hartford (IX-13), Civil War relic
* Hawk (IX-14), ex-PY-2
* Prairie State (IX-15), ex-BB-7
* Tallahassee (IX-16), ex-BM-9
* Monadnock (IX-17), ex-BM-3
* Nantucket (IX-18), ex-PG-23
* Newport (IX-19), ex-PG-12
* Constellation (IX-20), museum ship
* Constitution (IX-21) [A], later 'none' classification as museum ship still in commission
* Oregon (IX-22), ex-BB-3
* Paducah (IX-23), ex-AG-7, later PG-18
* Philadelphia (IX-24), ex-C-4
* Reina Mercedes (IX-25), Spanish-American war prize
* Southery (IX-26)
* Sturgeon Bay (IX-27)
* Wheeling (IX-28), ex-PG-14
* Wilmette (IX-29)
* Dover (IX-30), ex-PG-8
* Wolverine (IX-31), ex-Michigan
* Yantic (IX-32)
* Newton (IX-33), ex-ID-4306
* Henry County (IX-34)
* Topeka (IX-35), ex-PG-35
* Light Target Number 2 (IX-36), ex-DD-136, later DMS-2, AG-19
* Light Target Number 3 (IX-37), ex-DD-275
* Empire State (IX-38), ex-AG-11
* Seattle (IX-39), ex-CA-11
* Olympia (IX-40), ex-CL-15, later museum ship
* America (IX-41), converted yacht
* Camden (IX-42), ex-AS-6
* Freedom (IX-43), converted yacht
* Damage Control Hulk Number 1 (IX-44), ex-DD-163
* Favorite (IX-45)
* Transfer (IX-46)
* Vamarie (IX-47), converted yacht
* Highland Light (IX-48), converted yacht
* Spindrift (IX-49), converted yacht
* Bowdoin (IX-50), converted yacht, former Arctic research vessel
* Sea Otter I (IX-51)
* Cheng Ho (IX-52), converted yacht
* Sea Otter II (IX-53)
* Galaxy (IX-54)
* Black Douglas (IX-55), ex-PYc-45, later royal yacht of Morocco
* Navajo (IX-56), ex-AT-52
* Araner (IX-57), converted yacht
* Dwyn Wen (IX-58), converted yacht
* Volador (IX-59), converted yacht
* Seaward (IX-60), converted yacht
* Geoanna (IX-61), converted yacht, later US Army TP-249
* Vileehi (IX-62), converted yacht
* Zahma (IX-63), converted yacht
* Wolverine (IX-64), ex-SS Seeandbee, Great Lakes Aircraft Training Carrier (CV)
* Blue Dolphin (IX-65), converted yacht
* Migrant (IX-66), converted yacht
* Guinevere (IX-67), converted yacht (note duplicated number)
* Burleson (IX-67), training ship, ex-APA-67 (note duplicated number)
* Seven Seas (IX-68), converted yacht
* Puritan (IX-69), converted yacht
* Gloria Dalton (IX-70), converted yacht
* Kailua (IX-71), ex-CS Dickenson (cable ship)
* Liberty Belle (IX-72)
* Zaca (IX-73), converted yacht
* Metha Nelson (IX-74), converted yacht
* John M. Howard (IX-75), ex-Elsie Fenimore converted yacht
* Ramona (IX-76), converted yacht
* Juniata (IX-77), converted yacht
* Brave (IX-78), converted yacht
* El Cano (IX-79), converted yacht
* Christiana (IX-80), seaplane tender, ex-USLHT Azalea, briefly USS Azalea (returned to USLHT service), later YAG-32
* Sable (IX-81), ex-SS Greater Buffalo, Great Lakes Aircraft Training Carrier (CV)
* Luster (IX-82), converted yacht
* Ashley (IX-83), converted yacht
* Congaree (IX-84), converted yacht
* Euhaw (IX-85), converted yacht
* Pocotaligo (IX-86), converted yacht
* Saluda (IX-87), converted yacht, sound test ship, later YAG-87
* Wimbee (IX-88), converted yacht
* Romain (IX-89), converted yacht
* Forbes (IX-90), converted yacht
* Palomas (IX-91), converted yacht
* Liston (IX-92), converted yacht
* Irene Forsyte (IX-93), converted yacht, Q-ship (armed decoy)
* Ronaki (IX-94), converted yacht, grounded eastern Australia, 18 June 1943
* Echo (IX-95), converted yacht
* Richard Peck (IX-96), electric generator
* Martha's Vineyard (IX-97)
* Moosehead (IX-98), ex-DD-259, ex-YW-56, combat information center training ship
* Sea Cloud (IX-99), ex-WPG-284 weather ship
* Racer (IX-100), ex-PC-501, SC-501
* Big Chief (IX-101)
* Majaba (IX-102), ex-SS El Capitan, ex-AG-43
* E.A. Poe (IX-103), MC type EC2, mobile base dry storage
* Peter H. Burnett (IX-104), MC type EC2, mobile base dry storage
* Panther (IX-105), ex-SC-1470
* Greyhound (IX-106), ex-ID-1672
* Zebra (IX-107), MC type EC2, later AKN-5
* Atlantida (IX-108)
* Antelope (IX-109), MC type EC2, mobile base dry storage
* Ocelot (IX-110), mobile base command ship, wrecked by Typhoon Louise Okinawa October 1945
Armadillo-class: MC type Z-ET1-S-C3 hulls, mobile base storage tankers
* Armadillo (IX-111), ex-SS Sidney Howard
* Beagle (IX-112), ex-SS David Rittenhouse
* Camel (IX-113), ex-SS William H. Carruth
* Caribou (IX-114), ex-SS Nathaniel Palmer
* Elk (IX-115), ex-SS William Winter
* Gazelle (IX-116), ex-SS Cyrus K. Holliday
* Gemsbok (IX-117), ex-SS Carl R. Gray
* Giraffe (IX-118), ex-SS Sanford B. Dole
* Ibex (IX-119), ex-SS Nicholas Longworth
* Jaguar (IX-120), ex-SS Charles T. Yerkes
* Kangaroo (IX-121), ex-SS Paul Tulane
* Leopard (IX-122), ex-SS William B. Bankhead
* Mink (IX-123), ex-SS Judah Touro
* Moose (IX-124), ex-SS Mason L. Weems
* Panda (IX-125), ex-SS Opie Read
* Porcupine (IX-126), ex-SS Leif Ericson, sunk by kamikaze 30 December 1944, 7 killed
* Raccoon (IX-127), ex-SS J. C. W. Becham
* Stag (IX-128), ex-SS Norman O. Pedrick, converted to a distilling ship, later AW-1
* Whippet (IX-129), ex-SS Eugene W. Hilgard
* Wildcat (IX-130), ex-SS Leon Godchaux, converted to a distilling ship, later AW-2
Other unknown classes
* Abarenda (IX-131), ex-SS Acme, mobile base storage tanker
* Andrew Doria (IX-132), ex-SS Aleibiades
* Antona (IX-133), ex-SS Birkenhead
* Arayat (IX-134), ex-SS Faireno, mobile base storage tanker
* Arethusa (IX-135), ex-SS Gargoyle, mobile base storage tanker
* Carondelet (IX-136), ex-SS Gold Heels, mobile base storage tanker
* Celtic (IX-137), ex-SS Kerry Patch
* Malvern (IX-138), ex-SS Orissa
* Octorara (IX-139), ex-SS Purisima, mobile base storage tanker
* Quiros (IX-140), ex-SS Osmand
* Manileno (IX-141)
* Signal (IX-142), ex-ID-1532, mobile base storage tanker
* Silver Cloud (IX-143), ex-AO-10, mobile base storage tanker
* Clyde (IX-144)
* Villalobos (IX-145)
* Fortune (IX-146), mobile base aviation stores ship, later AVS-2
* Supply (IX-147), mobile base aviation stores ship, later AVS-1
* North Star (IX-148), ex-WPG-59
* Mustang (IX-155), ex-William H. Smith (fishing schooner), amphibious training ship
* City of Dalhart (IX-156), construction battalion (Seebee) command ship, Brodie landing system installed
* Orvetta (IX-157), ex-Tampa, mobile base barracks
Trefoil-class: MarCom B7-D1 concrete barges
* Midnight / Trefoil (IX-149)
* Quartz (IX-150), Operation Crossroads nuclear test participant
* Silica (IX-151), wrecked by Typhoon Louise Okinawa October 1945
* Carmita (IX-152), ex-Slate
* Asphalt (IX-153), wrecked 6 October 1944
* Bauxite (IX-154)
* Limestone (IX-158)
* Feldspar (IX-159)
* Marl (IX-160)
* Barite (IX-161)
* Lignite (IX-162), wrecked by Typhoon Louise Okinawa October 1945
* Cinnabar (IX-163)
* Corundum (IX-164)
Other unknown classes
* Flicker (IX-165), ex-AM-70
* Linnet (IX-166), ex-AM-76
* Leyden (IX-167), transport
* Southland (IX-168), transport
* President Warfield (IX-169), transport, later SS Exodus
* Curlew (IX-170), ex-AM-69
* Albatross (IX-171), ex-AM-71
* Bluebird (IX-172), ex-AM-72
* Etamin (IX-173), MC type EC2, ex-AK-93
* Grumium (IX-174), MC type EC2, ex-AK-112, mobile base aviation stores ship, later AVS-3
* Kestrel (IX-175), ex-AMc-5
* Kingbird (IX-176), ex-AMc-56
* Nightingale (IX-177), ex-AMc-149
* Banshee (IX-178), ex-SS Fairbanks
* Kenwood (IX-179)
* Flamingo (IX-180), ex-AMc-22
* Egret (IX-181), ex-AMc-24
* Donnell (IX-182), ex-DE-56, electric generator
* Catbird (IX-183), ex-AM-68, mine testing
* Clifton (IX-184), ex-SS Dilworth
* Stonewall (IX-185), ex-SS Frank G. Drum
* Dawn (IX-186), mobile base storage tanker
* Belusan (IX-187), ex-SS Vistula
* Chotauk (IX-188), ex-SS American Arrow, mobile base storage tanker
* Marmora (IX-189), ex-SS F.C. Fitzsimmons, mobile base storage tanker
* Nausett (IX-190), ex-SS W.M. Irish, mobile base storage tanker
* Vandalia (IX-191), ex-SS Walter Jennings, mobile base storage tanker, wrecked by Typhoon Louise Okinawa October 1945
* Flambeau (IX-192), ex-SS S.B. Hunt, mobile base storage tanker
* Meredosia (IX-193)
* Killdeer (IX-194), ex-AMc-21
* Goshawk (IX-195), ex-AM-79
* Spark (IX-196), ex-LST-340
* Mariveles (IX-197)
* Cohasset (IX-198), ex-LST-129
* Barcleo (IX-199), ex-AMb-17, ex-YP-375
* Maratanza (IX-200), ex-YP-448
* Sterling (IX-201), ex-YP-449
* Liberator (IX-202), ex-AMc-87
* Agile (IX-203), ex-AMc-111
* Allioth (IX-204), MC type EC2, ex-AK-109, mobile base aviation stores ship, later AVS-4
* Callao (IX-205), German icebreaker war prize Externsteine
* Chocura (IX-206), ex-PC-452
* Big Horn (IX-207), ex-AO-45, ex-Q-ship (armed decoy), oil storage vessel
* Domino (IX-208), mobile base dry storage, not acquired
* Seaward (IX-209), ex-LST-278
* Sea Foam (IX-210), mobile base storage tanker
* Castine (IX-211), ex-PC-452, experimental engine
* IX-212, ex-LCI(G)-396
* Serapis (IX-213), ex-SS District of Columbia, mobile base storage tanker
* Yucca (IX-214), ex-SS Utacarbon
* Don Marquis (IX-215), MC type EC2, mobile base dry storage
* Unicoi (IX-216), mobile base dry storage
* Tackle (IX-217), ex-ARST-4
* Gardoqui (IX-218), mobile base storage tanker
* Eureka (IX-221), ex-PC-488
* Pegasus (IX-222), ex-AK-48, mobile base dry storage
* Triana (IX-223), MC type EC2, mobile base dry storage
* Aide de Camp (IX-224), sonar research, converted yacht
* Harcourt (IX-225), MC type EC2
* Araner (IX-226), MC type EC2
* Gamage (IX-227) - same ship as Inca (IX-229)
* Justin (IX-228), MC type EC2
* Inca (IX-229), MC type EC2, mobile base dry storage, grounded by Typhoon Louise Okinawa October 1945
* Tapacola (IX-230), ex-AMc-54, target tug
* Stalwart (IX-231), ex-AMc-105, target tug
* Summit (IX-232), ex-AMc-106, target tug
* Canandaigua (IX-233), sonar test schooner, sank at pier in storm 22 November 1945
* Eastwind (IX-234), German racing yacht war prize
* Royone (IX-235), Naval Academy yacht
IX-236 through IX-299 unused
* Prinz Eugen (IX-300), German cruiser war prize, Operation Crossroads target
* Dithmarschen (IX-301), German replenishment oiler war prize, later USS Conecuh (AO-110 / AOR-110)
* Atlanta (IX-304), ex-CL-104, weapons effects test ship
* Prowess (IX-305), ex-AM-280, ex-MSF-280, training ship
* USS IX-306, ex-US Army FS-221
* Brier (IX-307), ex-WLI-299
* New Bedford (IX-308), ex-US Army FS-289, ex-AKL-17, Texas Towers support ship, torpedo testing
* Monob One (IX-309), ex-YW-87, later YAG-61
* USS IX-310, sonar test barge
* Benewah (IX-311), ex-APB-35
* Horst Wessel (IX-327), German barque war prize, later USCGC Eagle (WIX-327)
IX-328 through IX-500 unused
* Elk River (IX-501), ex-LSM-501, ex-LSMR-501, barracks ship
* Mercer (IX-502), ex-APB-39
* Nueces (IX-503), ex-APB-40
* Echols (IX-504), ex-APL-37, ex-APB-37
* IX-505, ex-YTM-759
* IX-506, ex-YFU-82
* General Hugh J. Gaffey (IX-507), ex-AP-121
* Orca (IX-508), ex-LCU-1618, ROV/AUV test support
* USS Underwater Explosives Barge Number 1 (IX-509)
* USS IX-510, ex-T-AP-127, barracks hulk
* USS IX-511, ex-LST-399
* IX-512, ex-US Army BD 6651
* IX-513, EMPRESS II (Electromagnetic Pulse Environment Simulator for Ships)
* Baylander (IX-514), ex-YFU-79, 1986 conversion to a helicopter Landing Ship for pilot training, nicknamed the "world's smallest aircraft carrier"
* IX-515, ex-WSES-1 (surface effect ship)
* IX-516, 3-story classroom Trident missile training barge
* Gosport (IX-517), ex-Pacific Escort, ex-Thomas G. Thompson
* Proteus (IX-518), ex-AS-19, berthing craft
* USS IX-519, ex-YC-1643, boat landing stage
* USS IX-520, ex-APL-19
* USS IX-521, ex-AFDB-1, section D
* USS IX-522, ex-ABSD-2, ex-AFDB-2, section D, target support barge
* USS IX-523, ex-YOG-93, training hulk (boarding party tactics)
* USS IX-524, ex-ABSD-2, ex-AFDB-2, section F, target support barge
* USS IX-525, ex-AFDB-1, section C
* USS IX-526, ex-YRST-1, later YR-94
* USS IX-527, ex-YFN-1259, submarine test support barge
* USS IX-528, ex-YR-55, ex-YRDH-1, submarine test support barge
* Sea Shadow (IX-529), radar stealth technology demonstrator
* USS IX-530, ex-YFN-268, ex-YFND-5
* USS IX-531, ex-YP-679
* Joint Venture (IX-532), experimental high speed transport
* USS IX-533, ex-US Army BD 6652, ex-YD-222
* USS IX-534, ex-ABSD-2, ex-AFDB-2, section B
* USS IX-535, ex-ABSD-2, ex-AFDB-2, section H
* USS IX-536
* Prevail (IX-537) [A], ex-AGOS-8, Training Support Vessel
* USS IX-538
* USS IX-539
* Neodesha (IX-540), ex-YTB-815, non-operational training hulk
* USS IX-541
* USS White Bush (IX-542), ex-YF-339, ex-WLM-542
* USS IX-543
* USS IX-544
* USS IX-545, ex-YTB-814, reusable target vehicle

## Unclassified miscellaneous submarines (IXSS)

A number of submarines were briefly given the IXSS hull symbol in 1971 prior to their disposal, nearly all had previously held the AGSS designation.
Gato class
* Cod (IXSS-224), ex-SS-224, AGSS-224, museum ship
* Rasher (IXSS-269), ex-SS-269, SSR-269, AGSS-269
Balao class
* Bowfin (IXSS-287), ex-SS-287, AGSS-287, museum ship
* Ling (IXSS-297), ex-SS-297, AGSS-297, museum ship
* Lionfish (IXSS-298), ex-SS-298, AGSS-298, museum ship
* Roncador (IXSS-301), ex-SS-301, AGSS-301
* Perch (IXSS-313), ex-SS-313, SSP-313, ASSP-313, APSS-313, LPSS-313
* Charr (IXSS-328), ex-SS-328, AGSS-328
* Carp (IXSS-338), ex-SS-338, AGSS-338
* Chopper (IXSS-342), ex-SS-342, AGSS-342
* Pampanito (IXSS-383), ex-SS-383, AGSS-383, museum ship
Tench class
* Torsk (IXSS-423), ex-SS-423, AGSS-423, museum ship
* Runner (IXSS-476), ex-SS-476, AGSS-476
* Requin (IXSS-481), ex-SS-481, SSR-481, AGSS-471, museum ship