List of unclassified miscellaneous vessels of the United States Navy

The IX 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
and
Ship status is indicated as either currently active, inactive, or precommissioning . 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
Experimental vessels
Former yachts
Mobile base vessels used by service squadrons
Retired warships
Training equipment and simulators
War prizes

As of 2026 only one ship, USS Prevail (IX-537), actively carries an IX hull symbol.

World War II

See also
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 :

Unclassified miscellaneous vessels (IX)

Annapolis (IX-1), ex-PG-10
Dispatch (IX-2), ex-Boston, protected cruiser
Briarcliff (IX-3), receiving ship
, 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
, 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), 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)
, ex-PG-8
, 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-3, 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
, 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
Blue Dolphin (IX-65), converted yacht
Migrant (IX-66), converted yacht
Guinevere (IX-67), converted yacht
Burleson (IX-67), training ship, ex-APA-67
Seven Seas (IX-68), converted yacht
Puritan (IX-69), converted yacht
Gloria Dalton (IX-70), converted yacht
Kailua (IX-71), ex-CS Dickenson
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, later YAG-32
Sable (IX-81), ex-SS Greater Buffalo, Great Lakes Aircraft Training Carrier
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 yachtListon, converted yacht
Irene Forsyte (IX-93), converted yacht, Q-ship Ronaki, converted yacht, grounded eastern Australia, 18 June 1943
Echo (IX-95), converted yacht
Richard Peck (IX-96), electric generatorMartha's Vineyard
Moosehead (IX-98), ex-DD-259, ex-YW-56, combat information center training ship
Sea Cloud (IX-99), ex-WPG-284 weather shipRacer, ex-PC-501, SC-501Big Chief
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 storagePanther, ex-SC-1470
Greyhound (IX-106), ex-ID-1672
Zebra (IX-107), MC type EC2, later AKN-5Atlantida
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 tankerAndrew Doria, ex-SS AleibiadesAntona, 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 tankerCeltic, ex-SS Kerry PatchMalvern, ex-SS Orissa
Octorara (IX-139), ex-SS Purisima, mobile base storage tankerQuiros, ex-SS OsmandManileno
Signal (IX-142), ex-ID-1532, mobile base storage tanker
Silver Cloud (IX-143), ex-AO-10, mobile base storage tankerClyde Villalobos
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, amphibious training ship
City of Dalhart (IX-156), construction battalion 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-149Banshee, ex-SS FairbanksKenwood
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 DilworthStonewall, ex-SS Frank G. Drum
Dawn (IX-186), mobile base storage tankerBelusan, 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 tankerMeredosia
Killdeer (IX-194), ex-AMc-21
Goshawk (IX-195), ex-AM-79
Spark (IX-196), ex-LST-340Mariveles Cohasset, ex-LST-129Barcleo, ex-AMb-17, ex-YP-375Maratanza, ex-YP-448Sterling, 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 ExternsteineChocura, ex-PC-452
Big Horn (IX-207), ex-AO-45, ex-Q-ship, oil storage vessel
Domino (IX-208), mobile base dry storage, not acquiredSeaward, ex-LST-278
Sea Foam (IX-210), mobile base storage tanker
Castine (IX-211), ex-PC-452, experimental engineIX-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 tankerEureka, 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 EC2Gamage - same ship as Inca
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
, sonar test schooner, sank at pier in storm 22 November 1945
, German racing yacht war prize
, 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
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-221Brier, ex-WLI-299
New Bedford (IX-308), ex-US Army FS-289, ex-AKL-17, Texas Towers support ship, torpedo testingMonob One, 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

IX-328 through IX-500 unusedElk River, ex-LSM-501, ex-LSMR-501, barracks ship

Mercer (IX-502), ex-APB-39
Nueces (IX-503), ex-APB-40
, ex-APL-37, ex-APB-37IX-505, ex-YTM-759IX-506, ex-YFU-82
, ex-AP-121Orca, ex-LCU-1618, ROV/AUV test support
USS Underwater Explosives Barge Number 1
USS IX-510, ex-T-AP-127, barracks hulk
USS IX-511, ex-LST-399IX-512, ex-US Army BD 6651IX-513, EMPRESS II
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 IX-516, 3-story classroom Trident missile training bargeGosport, 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
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
, 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.

Cod (IXSS-224), ex-SS-224, AGSS-224, museum ship
Rasher (IXSS-269), ex-SS-269, SSR-269, AGSS-269
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
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