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 : 8 October 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 29/10/2014   Noted once on 29/10/14 also 23/4/15 with ZK340 in callsign box
43CAE3 ????? Unknown ZK343 11/12/2014
43C739 ZJ915 14/09/2015 ZK311 04/09/2015 Possible ZK311 is op also as 43C739 - ZJ915 to Falklands 14/9/15
Hex Code Regn. A/C Type Date Remarks
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
43C6F2     05/03/2015 Active noted for 1st time, no more detail
43C758 (ZZ511) Wildcat AH1 09/03/2015 Predicted sequence serial TBC
43C75A (ZZ513) Wildcat HMA2 28/04/2015 Predicted sequence serial TBC
43C339   Watchkeeper 07/05/2015 Reported as a Thales Watchkeeper UAV nr Aberporth range.
43C80D   Watchkeeper 03/06/2015 Noted operating from Boscombe Down
43C672 (ZF143) Tucano T1 31/07/2015 Noted 1st time as "LOP30" serial TBC
43C798 ZK370 Typhoon FGR4 07/08/2015 Notes 1st time on test flight ex Warton as "Tarnish 69"
43C7CF ZK552 Chinook HC6 24/08/2015 Confirmed at Coningsby
43C7B6 ZK605 Typhoon EFA 28/07/2015 Noted on a test flight from Warton now confirmed
43C67C ZF239 Tucano T1 28/08/2015 Confirmed DTV as "Galleon 2"
43C760 ZZ519 Wildcat HMA2 30/08/2015 Confirmed as "WHE03" 06/15
43C761 ZZ520 Wildcat AH1 30/08/2015 Confirmed as "WHE03" 07/15
43C762 ZZ521 Wildcat AH1 30/08/2015 Confirmed as "WHE02" 08/15
43C317 ZH824 Merlin HM2 05/09/2015 Misscode? 43C317 should be ZH845 - noted Prestwick
43C5DF ZM405 Atlas C1 10/09/2015 Delivered to the RAF
43C7B7 ZK606 Typhoon EFA 15/09/2015 Confirmed as test flight 26/08/15
43C7D3 ZK556 Chinook HC6 15/09/2015 Noted flying with ZK556 & BOE22 callsigns fits predicted seq.
43C739 ZJ915 Typhoon FGR4 15/09/2015 Dep to Falklands this code was (is?) used by ZK311
43C39C ZZ665 RC135W 18/09/2015 Noted as "Same 40"
43C7B8 ZK607 Typhoon EFA 18/09/2015 Test flight from Warton
43C59F ZM405 Atlas C1 19/09/2015 Miss coded box s/be 43C5DF also used 43C6DF on 18/09
43C6F9 ZZ336 Voyager KC3 23/09/2015 Noted using ID as ZZ336 ex G-VYGG
43C6FE ZZ341 Voyager KC3 23/09/2015 Confirmed Brize 20/7 as "RRR125"
43C6EF WK008 Watchkeeper 23/09/2015 Noted out of Boscombe - serial in c/s box
43C66D (ZF135) Tucano T1 08/10/2015 Noted 1st time as "LOP10" serial from predicted sequence
43C73F   Typhoon 08/10/2015 Noted as "Pyscho 21"

(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 ZJ925 Typhoon FGR4 23/03/2015 Two using the same code see below both noted 08/04/15
000AD3 ZJ937 Typhoon FGR4 08/04/2015 see above
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
42726F (ZJ186/ZJ218) Apache AH1 07/05/2015 Possible one of two aircraft
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'
438613 ZJ990 Merlin HC3A 22/07/2015 Noted with serial in callsign box
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
43C317 ZH845 Merlin HM2 05/09/2015 Noted as ZH824 at Prestwick
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 Chinook
43C549 ZG919 Lynx AH9 15/04/2012 Was noted with XZ729 in the callsign box on SBS
43C59F ZM405 Atlas C1 18/09/2015 Miss coded for 43C5DF (also used 43C6DF!)
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
E3C283 XW199 Puma HC1 22/07/2015 Misscoded noted Leeming s/be 43C283
(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