Compiled by : Ian McMaster & Dave Anderson
This list has been assembled from sources considered reliable, however as with any non-official listing there may at times be one or two corrections that need to be made. If you can contribute any new or updated information please go to the website homepage and click ''e mail the updating team''
A big thank you to the following for their input and feedback:-
Phil Cross; Lawrence Fizia; Steve Martin; Don McLoughlin; Jon; Mark Presswood; Nick; Dave Tuplin;
Rod Webb, Trevor Lloyd, Andy Court, Mick Leahcim, Bones & Paul Jarvis, Trubb (A special thanks for all of the historic data which has completed many gaps), Tom Wylie, Iwan Davies, Chris Globe, Steve Cheeseman, Skywatch, Mike Stanners, Gary Claridge-King, Graham Farish, John Lancaster
Last Update : 27 March 2015
Notes  : Typhoon codes - There has been some changing of codes,  Visual sightings are recommended on what
seems like possible out of sequence codes being corrected?  I've tried to sumarise the changes in this column. The dates are
when we have noted them not official change dates
Mode S Current 1st noted Was Last noted Notes
43C488 ZJ808 13/11/2014 ZJ813 07/11/2014
43C492 ZJ912 21/01/2015 ZJ914    
43C497 ZJ917 11/12/2014
43C48D ZJ813 23/09/2014
43C49D (ZJ923) waiting conf ZJ917 03/12/2014
43C6A9 ????? Unknown ZK380 12/05/2014
43C6CB ZK343 12/12/2014 ZK315 02/09/2014  
43C6CB ZK315 17/02/2015     both ZK315 & ZK343 are using the same code at the moment!!!
43C6CF ZK340 19/12/2014 ZK317 17/12/2014
43C742 ZK380 06/11/2014
43CAEE (ZK340)   Noted once on 29/10/14 may have been misscoded???
43CAE3 ????? Unknown ZK343 11/12/2014
Hex Code Regn. A/C Type Date Remarks
43C6A0 (ZF512) Tucano T1 08/10/2014 Noted 1st time as "LOP15" serial tbc
43CB58 (ZZ511) Wildcat AH1 01/11/2014 Serial needs confirming noted as WHE05
43CAEE (ZK340) Typhoon FGR4  01/11/2014 Noted as Jedi12 on 29/10/14 also used 43C6CF see note above
43C78A (ZK393) Typhoon EFA 28/11/2014 Test flight ex Warton as "WTN09" 1st time noted
43C492 ZJ912 Typhoon FGR4 21/01/2015 Confirmed CBY was ZJ914 now fits sequence
43C69B ZF417 Tucano T1 22/01/2015 Confirmed at DTV as LOP20 fits predicted sequence
43C68A ZF317 Tucano T1 23/01/2015 Noted 1st time as "LOP19" serial tbc
43C673 ZF144 Tucano T1 03/02/2015 Noted 1st time as "LOP30" serial confirmed at Linton
43C479 ZR354 Merlin Mk611 06/02/2015 Confirmed at Yeovil as "WHE05"
43C67A ZF205 Tucano T1 16/01/2015 Noted 1st time as "LOP15" serial confirmed 17/02/15
43C69E (ZF489) Tucano T1 20/02/2015 Noted 1st time as "LOP30" serial tbc
43C68A ZF317 Tucano T1 23/01/2015 Noted 1st time as "LOP19" serial confirmed 25/02/15
43C5DC ZM402 A400M Atlas C1 27/02/2015 New for RAF delivered BZZ 27/02/15
43C6F2     05/03/2015 Active noted for 1st time, no more detail
43C6A1 ZF515 Tucano T1 21/11/2014 Noted 1st time as "LOP18" serial confirmed 06/03/15
43C696 ZF378 Tucano T1 13/01/2015 Noted 1st time as "LOP13" serial confirmed 20/02/15
43C759 ZZ512 Wildcat AH1 19/12/2014 Noted as "WHE02" confirmed Coningsby 09/03/15
43C758 (ZZ511) Wildcat AH1 09/03/2015 Predicted sequence serial TBC
43C7B2   Typhoon EFA 16/03/2015 1st time notes as "WTN 29"
43C75C ZZ515 Wildcat AH1 20/03/2015 1st time noted as "WHE03" fits predicted sequence
43C69E (ZF489) Tucano T1 25/03/2015 Noted 1st time as "LOP30" serial tbc
43C7B1 ZK600 Typhoon EFA 13/03/2015 1st time notes as "WTN 69" serial confirmed 23/03/15
43C738 ZK310 Typhoon FGR4 25/03/2015 Serial confirmed o/s DTV as "X3P17"
43C682 (ZF287) Tucano T1 27/03/2015 Noted 1st time as "LOP30" serial tbc

(If you are aware that any of the Conflicts have been fixed please E Mail the Updating Team)
Hex Code Regn. A/C Type Date Remarks
000001   A330 Voyager 13/04/2014 Used by a number of aircraft including USAFE F15's
000100   Tornado GR4 25/03/2013 Noted as Saxon 1 (25/03/13) & Vandal 01 (26/03/13) - Not an Indian IL76
000359 ZJ954 Puma HC1 05/01/2015 Noted as Vortex 331 13/01/15
000AD3 ZJ937 Typhoon FGR4 23/03/2015 1st noted as "Razor 21"
03C059 ZA541 Tornado GR4 04/10/2012 Should be using 43C159
03C080   Tornado GR4 18/10/2012 As yet not identified
03C094 ZA600 Tornado GR4 01/03/2013 Another box miscoded out of Marham
03C0C9 ZA472 Tornado GR4 23/05/2012 Was noted as MRM88 code should be 43C1C9
03C16D ZA556 Tornado GR4 06/12/2012 Operating as WTN21 Lossiemouth-Marham (Ferry Flight)
053977 ZK001 Merlin HC3 25/08/2012 Should be using code 43C617
180000 ZZ172 C17A 06/08/2014 Noted as Ascot 815
249249   Various 12/01/2013 Used by a number of UK aircraft including Sea King, Merlin, Typhoon
260701   Typhoon 09/04/2014 Bae Systems trials aircraft. Used on many different airframes
430382 ZA400 Tornado GR4 27/06/2013 Overshot Teesside, should be 43C182
43455F XZ670 Lynx AH7 11/04/2012 Should be using code 43C51F, still wrongly allocated in Nov 12.
436CA9   Helicopter 24/04/2014 Noted as 'SHF010'
43A1DB ZA492 Tornado GR4 26/06/2014 Noted as 'Lossie 22' should be 43C1DB
43C01B ZE389 Helicopter 19/06/2014 Old Tornado F3 code, may now be used by a Chinook HC6
43C06C ZJ117 Merlin HC3 02/10/2014 Noted with ZJ120 in the callsign box - Serial T.B.C.
43C0C9 XX456 Gazelle AH1 03/10/2012 Used by Tornado GR4 ZA472 which should be using 43C1C9
43C129 ZG997 Islander AL1 03/10/2012 Used by Tornado GR4 ZA598 which should be using 43C179
43C139 XW665 Nimrod (Not) 07/05/2013 Noted active again. Not a Nimrod as the rego. Would suggest
43C14B ZG707 Tornado GR4 30/10/2012 Is also a C130 C4 ZH868 which also uses this code, the GR4 however fits the expected sequence.
43C15F ZA449 Tornado GR4 12/05/2014 Code was used by ZA404 (scrapped) this one should be 43C19F
43C1BF ZD739 Tornado GR4 20/02/2013 Should be coded 43C1BA
43C1E4 ZJ705 / ZJ136 B412 / Merlin 20/10/2013 ZJ136 has been noted recently using the code allocated to ZJ705
43C1F3 G-CIFE Beech 200 20/08/2014 Aircraft was ZK450, still using Mil code instead of 400A76
43C1F9 ZJ133 Merlin HC3 14/08/2012 Was noted flying with ZJ134 in the callsign box on SBS
43C225 ZJ130 Merlin HC3 09/12/2013 Was noted flying with ZJ122 in the callsign box on SBS
43C25E ZJ166 Apache AH1 28/03/2012 Visual sighting of ZJ173 using this code, but still used by ZJ166
43C26B ZJ214 Apache AH1 02/09/2013 Visual sighting of ZJ214 using this code
43C2CE XZ726 Lynx HMA8 06/08/2012 Noted flying with XZ731 in the SBS callsign box
43C2D0 XZ729 Lynx HMA8 21/07/2013 Noted flying with XZ729 in the SBS callsign box
43C2FB ZJ990 Merlin HC3A 06/11/2012 Interin code for ex Danish AF machine - recoded 43C612
43C2FC ZJ992 Merlin HC3A 06/11/2012 Interin code for ex Danish AF machine - recoded 43C613
43C2FD ZJ994 Merlin HC3A 06/11/2012 Interin code for ex Danish AF machine - recoded 43C614
43C2FE ZJ995 Merlin HC3A 06/11/2012 Interin code for ex Danish AF machine - recoded 43C615
43C2FF ZJ998 Merlin HC3A 06/11/2012 Interin code for ex Danish AF machine - recoded 43C616
43C300 ZK001 Merlin HC3A 06/11/2012 Interin code for ex Danish AF machine - recoded 43C617, also used by AACHF XP820 & XT626 not sure which is current
43C326 ZH860 C130J Hercules 25/05/2012 Noted around the Galashiels area with ZH828 in the SBS c/s box
43C451 XX317 Hawk T1A (F) 10/10/2008 Mode-S reported as being 43C450 which is allocated to XX316
43C45A (XX326) Hawk T1A 11/10/2012 Hawk climbing out of Leeming using this Hex Code , however XX326 is stored at Shawbury (front section only)
43C4F8 XZ208 Lynx AH7 25/04/2012 Was noted as a Chinnok
43C549 ZG919 Lynx AH9 15/04/2012 Was noted with XZ729 in the callsign box on SBS
43C613 ZJ992 Merlin HC3 20/04/2012 Noted at Cranfield with ZJ992 in the SBS c/s box so has there been a code change ?
43C614 ZJ994 Merlin HC3 17/04/2012 Was noted at Cranfield with ZJ992 in the c/s box & quoted by pilot to ATC as ZJ992
43C62A (XZ597) Sea King HAR3 17/10/2013 Was noted flying in the Valley Area with XZ598 in the callsign box
43C62B (XZ598) Sea King HAR3 30/09/2013 Was noted flying in the Valley Area with XZ599 in the callsign box
43C62C (XZ599) Sea King HAR3 30/09/2013 See note above re 43C62B
43C6CB ZK315 Typhoon FGR4 12/12/2014 Now used by ZK343 as well both noted 17/2/15
43C6CF ZK317 Typhoon FGR4 18/12/2012 Now flying as ZK340 (Havoc 41) at Coningsby. - ZK317 departed to Leuchars on 13/12/12 - we now have two with the same code.
43C633 (ZK542) Seaking HAR3 11/11/2014 Code used by Typhoon "LOS11" possibly ZK348
43C719 ZJ272 & ZJ273 Squirrel HT1 29/01/2013 Same code on both aircraft when airborne at the same time
43C72E ZJ246 Squirrel HT1 18/09/2013 Was noted flying as ZJ244
43CAE7 ZK333 Typhoon FGR4 28/11/2012 Now coded 43C73A - see note below
43CAEB ZK337 Typhoon FGR4 05/11/2012 Now coded 43C748 - Maybe this batch are all being recoded.
43CAEE (ZK340) Typhoon FGR4 20/10/2014 Was using 43C6CF see note above - visual conf required.
43CB0B ZK382 Typhoon FGr4 09/05/2013 Noted with Winston 41 as the callsign
AAAAAA Various Typhoon   Various Factory default setting for many Mode-S Boxes on newly delivered aircraft.
C3C361 ZA299 Sea King HC4 15/02/2011 Has been flying with this code since 03/11 with Fly Navy in c/s box
(XV249) Registration in brackets = Forecast allocation based on a pattern to allocations but not a confirmed allocation
XV249 Registration in 'Bold Red text' is a registration or allocation that may be suspect due to mode-s box swapping etc.
XV249 Registration & Aircraft Type with 'Strike through' = Allocation not now carried by that aircraft. IE A/C wfu or w/o