Spare broadcast call signs

Available KO call signs

334 of the 676 KO four-letter combinations aren't held by any broadcast station. K calls go to stations west of the Mississippi River. Click any call to check it.

Found one you like? Check it before you file.

The FCC's own call sign search only looks at broadcast stations. Our free Call Sign Check also looks at FCC ship licenses and shortwave stations, tells you if a call was just released or is changing hands, and explains the rule behind every answer.

KO call signs at a glance

Of the 676 four-letter KO combinations, 342 belong to broadcast stations and 334 are spare.

Those 342 calls are used by 370 stations (a call can be shared across services, like KXXX and KXXX-FM):

FM: 183
AM: 65
LPFM: 63
Full-power TV: 42
Low power TV: 10
Class A TV: 7

KO stations on the air include KOAC (AM, Corvallis, OR), KODY (AM, North Platte, NE), KOJB (FM, Cass Lake, MN), KOLY (AM, Mobridge, SD), KOPJ (FM, Sebeka, MN), KOTS (AM, Deming, NM).

The newest KO call: KORZ-LP, a new station's first call sign on September 9, 2026.

Among the spare ones: 2 released in the last 60 days, 4 used by a ship or shortwave station, 4 old ship calls whose license lapsed. Run any of them through Call Sign Check before you file.

Just released

KOHM KOWL

All spare KO call signs

Just released Used by a ship or shortwave station: check before you file Old ship call (license lapsed)

KOAD KOAE KOAF KOAG KOAJ KOAO KOAQ KOAV KOAW KOAX KOBA KOBD KOBG KOBJ KOBL KOBP KOBU KOBW KOBX KOBY KOBZ KOCG KOCH KOCJ KOCK KOCS KOCT KOCV KOCX KODB KODN KODO KODP KODQ KODR KODT KODU KODW KOEB KOEC KOEE KOEF KOEH KOEI KOEJ KOEK KOEM KOEN KOEO KOEP KOEQ KOER KOES KOEU KOEV KOEW KOEX KOEY KOFB KOFD KOFF KOFL KOFN KOFQ KOFR KOFS KOFT KOFU KOFV KOFZ KOGB KOGC KOGE KOGF KOGH KOGK KOGP KOGS KOGT KOGU KOGV KOGX KOGY KOGZ KOHB KOHE KOHG KOHJ KOHK KOHM KOHP KOHQ KOHW KOHX KOHY KOHZ KOIB KOIC KOID KOIE KOIF KOIG KOIH KOIJ KOIK KOIM KOIO KOIP KOIQ KOIS KOIU KOIV KOIW KOIX KOIY KOIZ KOJA KOJE KOJF KOJG KOJJ KOJK KOJL KOJN KOJQ KOJR KOJS KOJT KOJU KOJV KOJW KOJX KOJZ KOKD KOKG KOKM KOKV KOKW KOLM KOLQ KOLW KOMD KOMF KOMH KOMI KOMJ KOMK KOML KOMM KOMN KOMV KOMZ KONB KONF KONH KONJ KONK KONM KONS KONT KONU KONW KONX KONZ KOOA KOOB KOOE KOOF KOOM KOON KOOX KOOY KOPC KOPD KOPE KOPF KOPG KOPH KOPK KOPM KOPP KOPQ KOPT KOPU KOPV KOPZ KOQA KOQB KOQC KOQD KOQE KOQF KOQG KOQH KOQI KOQJ KOQK KOQM KOQN KOQO KOQP KOQQ KOQR KOQS KOQT KOQU KOQV KOQW KOQX KOQY KOQZ KORF KORH KORJ KORP KORW KOSH KOSK KOSM KOSQ KOSV KOSX KOSZ KOTB KOTG KOTH KOTJ KOTK KOTL KOTP KOTQ KOTT KOTW KOTX KOTY KOUB KOUC KOUD KOUE KOUF KOUH KOUK KOUM KOUN KOUP KOUQ KOUX KOUY KOUZ KOVA KOVB KOVD KOVF KOVG KOVH KOVI KOVJ KOVK KOVL KOVM KOVN KOVP KOVQ KOVS KOVT KOVU KOVV KOVW KOVX KOVY KOVZ KOWA KOWC KOWE KOWF KOWG KOWH KOWK KOWL KOWM KOWP KOWQ KOWR KOWT KOWU KOWV KOWW KOWX KOXA KOXB KOXD KOXF KOXG KOXH KOXJ KOXK KOXL KOXM KOXN KOXO KOXP KOXQ KOXS KOXT KOXU KOXV KOXW KOXX KOXY KOYB KOYD KOYF KOYG KOYI KOYJ KOYK KOYL KOYP KOYQ KOYV KOYW KOYX KOYZ KOZC KOZD KOZF KOZG KOZH KOZM KOZP KOZS KOZU KOZV KOZW

← KN call signs All prefixes KP call signs →

Spare call signs by prefix

K call signs: stations west of the Mississippi River

W call signs: stations east of the Mississippi River

Found one you like? Check it before you file.

From the FCC's station, ship and shortwave records as of October 16, 2026, updated every morning. Not a product of the FCC.