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.[1][2] While many of the vessels in this category were former yachts, it also includes retired warships (mainly battleships and gunboats), vessels used in mobile bases by service squadrons (command ships, barracks ships, bulk storage ships, unnamed barges, and floating shipyard equipment), training equipment and simulators (including two Great Lakes-based paddlewheel aircraft carriers), war prizes, experimental vessels, and one armed decoy (Q-ship).
A similar list of 'miscellaneous' ships can found at List of auxiliaries of the United States Navy § Miscellaneous Ships (AG, T-AG).
Vessels
- 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
- 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)
- Constitution (IX-21), later 'none' classification
- 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
- 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
- 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), 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), 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
- 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
- Ronaki (IX-94), converted yacht
- Echo (IX-95), converted yacht
- Richard Peck (IX-96), electric generator
- Martha's Vineyard (IX-97)
- Moosehead (IX-98), ex-DD-259, combat information center training ship
- Sea Cloud (IX-99), ex-WPG-284 weather ship
- Racer (IX-100)
- Big Chief (IX-101)
- Majaba (IX-102), ex-SS El Capitan, ex-AG-43
- E.A. Poe (IX-103), mobile base dry storage
- Peter H. Burnett (IX-104), mobile base dry storage
- Panther (IX-105), ex-SC-1470
- Greyhound (IX-106), ex-ID-1672
- Zebra (IX-107), later AKN-5
- Atlantida (IX-108)
- Antelope (IX-109), mobile base dry storage
- Ocelot (IX-110), mobile base command ship, wrecked
- Armadillo (IX-111), ex-SS Sidney Howard, mobile base storage tanker
- Beagle (IX-112), ex-SS David Rittenhouse, mobile base storage tanker
- Camel (IX-113), ex-SS William H. Carruth, mobile base storage tanker
- Caribou (IX-114), ex-SS Nathaniel Palmer, mobile base storage tanker
- Elk (IX-115), ex-SS William Winter, mobile base storage tanker
- Gazelle (IX-116), ex-SS Cyrus K. Holliday, mobile base storage tanker
- Gemsbok (IX-117), ex-SS Carl R. Gray, mobile base storage tanker
- Giraffe (IX-118), ex-SS Sanford B. Dole, mobile base storage tanker
- Ibex (IX-119), ex-SS Nicholas Longworth, mobile base storage tanker
- Jaguar (IX-120), ex-SS Charles T. Yerkes, mobile base storage tanker
- Kangaroo (IX-121), ex-SS Paul Tulane, mobile base storage tanker
- Leopard (IX-122), ex-SS William B. Bankhead, mobile base storage tanker
- Mink (IX-123), ex-SS Judah Touro, mobile base storage tanker
- Moose (IX-124), ex-SS Mason L. Weems, mobile base storage tanker
- Panda (IX-125), ex-SS Opie Read, mobile base storage tanker
- Porcupine (IX-126), mobile base storage tanker, sunk by kamikaze
- Raccoon (IX-127), mobile base storage tanker
- Stag (IX-128), ex-AW-1
- Whippet (IX-129), mobile base storage tanker
- Wildcat (IX-130), ex-AW-2
- 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), ex-AVS-2
- Supply (IX-147), ex-AVS-1
- North Star (IX-148), ex-WPG-59
- Trefoil (IX-149), barge
- Quartz (IX-150), barge
- Silica (IX-151), barge, wrecked by Typhoon Louise Okinawa October 1945
- Carmita (IX-152), ex-Slate, barge
- Asphalt (IX-153), barge, wrecked
- Bauxite (IX-154), barge
- Mustang (IX-155), ex-William H. Smith (fishing schooner)
- City of Dalhart (IX-156), construction battalion (Seebee) command ship
- Orvetta (IX-157), ex-Tampa, mobile base barracks
- Limestone (IX-158), barge
- Feldspar (IX-159), barge
- Marl (IX-160), barge
- Barite (IX-161), barge
- Lignite (IX-162), barge, wrecked
- Cinnabar (IX-163), barge
- Corundum (IX-164), barge
- 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), ex-AK-93
- Grumium (IX-174), ex-AK-112, 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
- 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), ex-AK-109, later AVS-4
- Callao (IX-205), German icebreaker war prize Externsteine
- Chocura (IX-206), ex-PC-452
- Big Horn (IX-207), ex-AO-45, Q-ship (armed decoy)
- 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
- USS 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), 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), mobile base dry storage
- Aide de Camp (IX-224), sonar research, converted yacht
- Harcourt (IX-225)
- Araner (IX-226)
- Gamage (IX-227) - same ship as Inca (IX-229)
- Justin (IX-228)
- Inca (IX-229), mobile base dry storage
- 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
- 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
- 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
- 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
- USS IX-505, ex-YTM-759
- USS 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
- USS IX-512, ex-US Army BD 6651
- USS 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"
- USS IX-515, ex-WSES-1 (surface effect ship)
- USS 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), ex-AGOS-8
- USS IX-538
- USS IX-539
- Neodesha (IX-540), ex-YTB-815
- 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