Least Common Call Sign Suffixes

Posted June 23, 2020
Updated June 24, 2020

When a new call sign is issued, it is usually issued systematically. For example : KA4AAA, KA4AAB, KA4AAC, etc. The suffix are the letters after the number like AAA. There are some suffixes that are not issued systematically. Some may spell undesirable words. Some have special meanings in radio such as SOS or Q-codes and aren't available. Some were popular vanity call signs (WTF) and were taken before being issued systematically.

A full list of suffixes that aren't issued systematically isn't available. To find the possible suffixes, all individual (non-club) suffixes were searched and the ones with fewer than 20 systematic call signs matching were found.

Below is a list of suffixes and the number of systematic and vanity call signs. You can click the suffix to search QRZ.com for the suffix. Note, this searches all call signs, not just United States call signs.

Suffix Systematic Vanity
ASS017
BAG814
BOX918
COC010
COK11
CUM152
DIC48
DIK35
DOG376
DUD410
DUM31
FAG20
FUC00
FUK05
FUQ12
FUX04
GAS220
GAY14
GOD038
IMQ40
JAP415
JEW010
JUE20
KKK427
KOK211
LID512
MIK442
NUT632
OAF63
PEW510
PIG222
PIS00
PUE11
PUS20
QRA00
QRB00
QRC00
QRD00
QRE00
QRF00
QRG00
QRH00
QRI00
QRJ00
QRK00
QRL00
QRM00
QRN00
QRO00
QRP00
QRQ00
QRR00
QRS00
QRT00
QRU00
QRV00
QRW00
QRX00
QRY00
QRZ00
QSA00
QSB00
QSC00
QSD00
QSE00
QSF00
QSG00
QSH00
QSI00
QSJ00
QSK00
QSL00
QSM00
QSN00
QSO00
QSP00
QSQ00
QSR00
QSS00
QST00
QSU00
QSV00
QSW00
QSX00
QSY00
QSZ00
QTA00
QTB00
QTC00
QTD00
QTE00
QTF00
QTG00
QTH00
QTI00
QTJ00
QTK00
QTL00
QTM00
QTN00
QTO00
QTP00
QTQ00
QTR00
QTS00
QTT00
QTU00
QTV00
QTW00
QTX00
QTY00
QTZ00
QUA00
QUB00
QUC00
QUD00
QUE00
QUF10
QUG00
QUH00
QUI11
QUJ00
QUK00
QUL00
QUM00
QUN00
QUO00
QUP00
QUQ00
QUR00
QUS00
QUT10
QUU10
QUV20
QUW00
QUX00
QUY00
QUZ00
SAP212
SEX118
SOB018
SOS00
SUC10
SUK10
SUQ10
SUX32
TIT112
WOP44
WTF18135
XAA64
XAB61
XAC61
XAD72
XAE61
XAF51
XAG41
XAH70
XAI50
XAJ32
XAK50
XAL42
XAM54
XAN34
XAO61
XAP20
XAQ71
XAR51
XAS50
XAT51
XAU61
XAV61
XAW41
XAX63
XAY40
XAZ53
XBA50
XBB31
XBC12
XBD50
XBE60
XBF50
XBG12
XBH41
XBI61
XBJ60
XBK30
XBL50
XBM40
XBN60
XBO21
XBP31
XBQ50
XBR52
XBS52
XBT50
XBU30
XBV50
XBW50
XBX45
XBY21
XBZ60
XCA41
XCB63
XCC53
XCD50
XCE61
XCF30
XCG50
XCH30
XCI11
XCJ50
XCK41
XCL10
XCM40
XCN50
XCO72
XCP40
XCQ21
XCR71
XCS31
XCT62
XCU60
XCV40
XCW60
XCX61
XCY40
XCZ70
XDA43
XDB32
XDC31
XDD20
XDE42
XDF61
XDG41
XDH50
XDI40
XDJ23
XDK60
XDL11
XDM55
XDN52
XDO70
XDP40
XDQ30
XDR52
XDS53
XDT40
XDU40
XDV61
XDW31
XDX611
XDY41
XDZ41
XEA30
XEB20
XEC30
XED32
XEE70
XEF61
XEG41
XEH50
XEI71
XEJ60
XEK70
XEL32
XEM71
XEN65
XEO10
XEP40
XEQ61
XER62
XES53
XET70
XEU20
XEV42
XEW60
XEX62
XEY40
XEZ30
XFA50
XFB40
XFC71
XFD60
XFE32
XFF40
XFG40
XFH40
XFI30
XFJ31
XFK41
XFL20
XFM61
XFN50
XFO21
XFP41
XFQ20
XFR10
XFS21
XFT60
XFU30
XFV20
XFW40
XFX40
XFY20
XFZ40
XGA51
XGB22
XGC30
XGD10
XGE40
XGF61
XGG41
XGH41
XGI42
XGJ30
XGK30
XGL50
XGM41
XGN60
XGO21
XGP40
XGQ40
XGR50
XGS21
XGT61
XGU30
XGV30
XGW10
XGX30
XGY21
XGZ30
XHA40
XHB41
XHC50
XHD30
XHE40
XHF51
XHG30
XHH20
XHI80
XHJ30
XHK20
XHL70
XHM50
XHN20
XHO20
XHP20
XHQ40
XHR30
XHS40
XHT70
XHU40
XHV50
XHW30
XHX50
XHY30
XHZ50
XIA61
XIB50
XIC52
XID33
XIE31
XIF60
XIG60
XIH40
XII51
XIJ30
XIK30
XIL31
XIM41
XIN50
XIO33
XIP40
XIQ60
XIR31
XIS50
XIT510
XIU30
XIV42
XIW10
XIX52
XIY30
XIZ40
XJA60
XJB20
XJC42
XJD60
XJE20
XJF13
XJG30
XJH20
XJI40
XJJ53
XJK50
XJL22
XJM61
XJN72
XJO50
XJP43
XJQ40
XJR13
XJS33
XJT64
XJU50
XJV10
XJW41
XJX40
XJY70
XJZ30
XKA70
XKB20
XKC30
XKD70
XKE42
XKF41
XKG51
XKH50
XKI40
XKJ90
XKK42
XKL40
XKM30
XKN40
XKO20
XKP40
XKQ50
XKR32
XKS70
XKT51
XKU51
XKV41
XKW51
XKX61
XKY40
XKZ51
XLA32
XLB51
XLC51
XLD82
XLE41
XLF41
XLG72
XLH32
XLI32
XLJ61
XLK40
XLL31
XLM31
XLN41
XLO50
XLP40
XLQ50
XLR711
XLS61
XLT77
XLU70
XLV51
XLW51
XLX40
XLY10
XLZ61
XMA40
XMB50
XMC60
XMD42
XME52
XMF50
XMG71
XMH50
XMI31
XMJ31
XMK70
XML47
XMM64
XMN35
XMO40
XMP40
XMQ30
XMR51
XMS52
XMT68
XMU60
XMV51
XMW70
XMX61
XMY50
XMZ61
XNA33
XNB10
XNC32
XND51
XNE41
XNF40
XNG30
XNH30
XNI60
XNJ40
XNK51
XNL20
XNM50
XNN31
XNO62
XNP60
XNQ50
XNR51
XNS50
XNT51
XNU60
XNV40
XNW41
XNX50
XNY30
XNZ31
XOA40
XOB50
XOC31
XOD50
XOE30
XOF51
XOG51
XOH51
XOI40
XOJ30
XOK42
XOL43
XOM72
XON32
XOO61
XOP50
XOQ50
XOR68
XOS60
XOT50
XOU60
XOV21
XOW00
XOX79
XOY51
XOZ50
XPA41
XPB40
XPC61
XPD62
XPE20
XPF31
XPG50
XPH40
XPI50
XPJ51
XPK71
XPL31
XPM71
XPN30
XPO55
XPP30
XPQ20
XPR33
XPS51
XPT51
XPU10
XPV30
XPW60
XPX41
XPY30
XPZ50
XQA50
XQB30
XQC60
XQD40
XQE31
XQF60
XQG60
XQH40
XQI50
XQJ50
XQK70
XQL61
XQM31
XQN30
XQO40
XQP50
XQQ30
XQR71
XQS50
XQT32
XQU20
XQV70
XQW30
XQX80
XQY60
XQZ20
XRA44
XRB51
XRC41
XRD52
XRE50
XRF54
XRG50
XRH21
XRI30
XRJ30
XRK21
XRL33
XRM44
XRN72
XRO31
XRP74
XRQ40
XRR60
XRS41
XRT58
XRU51
XRV60
XRW32
XRX61
XRY13
XRZ60
XSA42
XSB61
XSC40
XSD30
XSE30
XSF50
XSG50
XSH10
XSI50
XSJ30
XSK20
XSL40
XSM01
XSN60
XSO31
XSP22
XSQ20
XSR60
XSS51
XST32
XSU41
XSV40
XSW41
XSX40
XSY30
XSZ30
XTA62
XTB33
XTC615
XTD40
XTE71
XTF51
XTG80
XTH71
XTI50
XTJ72
XTK42
XTL36
XTM61
XTN14
XTO22
XTP40
XTQ41
XTR39
XTS65
XTT73
XTU40
XTV50
XTW21
XTX65
XTY42
XTZ34
XUA60
XUB32
XUC50
XUD60
XUE50
XUF40
XUG30
XUH30
XUI40
XUJ60
XUK32
XUL50
XUM20
XUN50
XUO40
XUP41
XUQ70
XUR40
XUS71
XUT50
XUU31
XUV50
XUW10
XUX51
XUY50
XUZ31
XVA40
XVB70
XVC20
XVD40
XVE40
XVF70
XVG30
XVH30
XVI20
XVJ30
XVK60
XVL41
XVM51
XVN10
XVO20
XVP80
XVQ40
XVR30
XVS20
XVT92
XVU50
XVV51
XVW41
XVX51
XVY40
XVZ50
XWA41
XWB60
XWC30
XWD80
XWE70
XWF60
XWG51
XWH90
XWI70
XWJ50
XWK40
XWL50
XWM40
XWN50
XWO50
XWP30
XWQ50
XWR20
XWS80
XWT41
XWU50
XWV40
XWW42
XWX43
XWY20
XWZ41
XXA53
XXB33
XXC40
XXD40
XXE40
XXF40
XXG40
XXH61
XXI61
XXJ10
XXK51
XXL87
XXM62
XXN81
XXO62
XXP40
XXQ60
XXR50
XXS40
XXT50
XXU60
XXV63
XXW31
XXX524
XXY40
XXZ63
XYA30
XYB42
XYC40
XYD50
XYE30
XYF30
XYG40
XYH20
XYI50
XYJ40
XYK30
XYL328
XYM51
XYN50
XYO61
XYP60
XYQ20
XYR52
XYS30
XYT70
XYU20
XYV50
XYW30
XYX61
XYY40
XYZ820
XZA31
XZB50
XZC30
XZD40
XZE30
XZF50
XZG10
XZH31
XZI60
XZJ41
XZK50
XZL50
XZM21
XZN80
XZO30
XZP60
XZQ10
XZR31
XZS51
XZT50
XZU30
XZV40
XZW30
XZX36
XZY40
XZZ63