Real world company prefixes

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M n O P Q R S T U V W X Y Z Ø
U0 U1 U2 U3 U4 U5 U6 U7 U8 U9 UA UB UC UD UE UF UG UH UI UJ UK UL UM UN UO UP UQ UR US UT UU UV UW UX UY UZ
UCA UCB UCC UCD UCE UCF UCG UCH UCI UCK UCL UCM UCN UCO UCP UCR UCS UCT UCU UCV UCW UCX
UCKX
1 UCK State Firefighting Service Of The Eastern Kazakhstan Region Callsign: Galeta, KZ AVCODES
2 UCK Air Division of the Eastern Kazakhstan Region     ICAO1
3 UCKX Union Coal & Coke Co. (Bethlehem Steel Co.) 8/1920-7/1923   NAKINA
4 UCKX BETHLEHEM STEEL CO. [UNION COAL & COKE CO.]     PWRC