Apparatus

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sensors Mode-S transponder

400AFF

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-EUXG · AIRBUS A-321

Hex
400AFF
Octal
20005377
Decimal
4,197,119
Country
GB
Tail
G-EUXG
Type
A321
No current signal · last broadcast 4h ago
Flights observed
172
Distinct callsigns
20
Country
GB
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 400AFF.

Country allocation

The ICAO 24-bit address 400AFF falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
EFW527R - 6 2026-06-14
EFW3MG BA Euroflyer 6 2026-05-26
EFW22D BA Euroflyer 6 2026-05-26
EFW9RZ - 5 2026-06-17
EFW12LS BA Euroflyer 5 2026-06-17
EFW811N BA Euroflyer 4 2026-06-14
EFW74JG BA Euroflyer 4 2026-06-13
EFW6KJ BA Euroflyer 4 2026-06-14
EFW568X BA Euroflyer 4 2026-06-14
EFW29WB BA Euroflyer 4 2026-06-06
EFW26CX BA Euroflyer 4 2026-06-06
EFW23SM BA Euroflyer 4 2026-06-13
EFW1FG BA Euroflyer 4 2026-06-03
EFW16PH BA Euroflyer 4 2026-06-03
EFW8RA BA Euroflyer 3 2026-06-17
EFW79YW - 3 2026-06-19
EFW75H - 3 2026-06-19
EFW6RQ BA Euroflyer 3 2026-06-12
EFW657G BA Euroflyer 3 2026-06-17
EFW62ME - 3 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-22 EFW74V KGS → LGW Jun 22, 19:49 UTCJun 22, 23:24 UTC3h 35m
2026-06-22 EFW81W LGW → KGS Jun 22, 14:40 UTCJun 22, 18:04 UTC3h 25m
2026-06-22 EFW61U ALC → LGW Jun 22, 09:49 UTCJun 22, 12:00 UTC2h 10m
2026-06-22 EFW1RF LGW → ALC Jun 22, 06:15 UTCJun 22, 08:19 UTC2h 5m
2026-06-21 EFW83SY RHO → LGW Jun 21, 18:54 UTCJun 21, 22:40 UTC3h 45m
2026-06-21 EFW147P LGW → RHO Jun 21, 14:05 UTCJun 21, 17:39 UTC3h 35m
2026-06-21 EFW337J NCE → LGW Jun 21, 10:29 UTCJun 21, 12:19 UTC1h 50m
2026-06-21 EFW16HC LGW → NCE Jun 21, 07:40 UTCJun 21, 09:15 UTC1h 35m
2026-06-20 EFW93ML ACE → LGW Jun 20, 19:29 UTCJun 20, 22:54 UTC3h 25m
2026-06-20 EFW595N LGW → ACE Jun 20, 14:50 UTCJun 20, 18:29 UTC3h 40m
2026-06-20 EFW16YK - Jun 20, 10:04 UTCJun 20, 12:14 UTC2h 10m
2026-06-20 EFW35LD - Jun 20, 06:24 UTCJun 20, 08:25 UTC2h 0m
2026-06-19 EFW75H FAO → LGW Jun 19, 19:14 UTCJun 19, 21:30 UTC2h 15m
2026-06-19 EFW3TW LGW → FAO Jun 19, 15:49 UTCJun 19, 18:09 UTC2h 20m
2026-06-19 EFW62ME IBZ → LGW Jun 19, 12:04 UTCJun 19, 14:15 UTC2h 10m
2026-06-19 EFW79YW LGW → IBZ Jun 19, 08:20 UTCJun 19, 10:24 UTC2h 5m
2026-06-18 EFW65TM CFU → LGW Jun 18, 17:21 UTCJun 18, 19:55 UTC2h 34m
2026-06-18 EFW93CA LGW → CFU Jun 18, 12:55 UTCJun 18, 15:20 UTC2h 25m
2026-06-18 EFW61U - Jun 18, 09:20 UTCJun 18, 11:20 UTC2h 0m
2026-06-18 EFW1RF - Jun 18, 05:55 UTCJun 18, 07:45 UTC1h 50m
2026-06-17 EFW8RA VRN → LGW Jun 17, 18:10 UTCJun 17, 19:40 UTC1h 30m
2026-06-17 EFW657G LGW → VRN Jun 17, 14:50 UTCJun 17, 16:20 UTC1h 30m
2026-06-17 EFW12LS MLA → LGW Jun 17, 10:05 UTCJun 17, 13:05 UTC3h 0m
2026-06-17 EFW9RZ LGW → MLA Jun 17, 06:10 UTCJun 17, 08:45 UTC2h 35m
2026-06-16 EFW8RA VRN → LGW Jun 16, 19:50 UTCJun 16, 21:25 UTC1h 35m
2026-06-16 EFW657G LGW → VRN Jun 16, 16:55 UTCJun 16, 18:20 UTC1h 25m
2026-06-16 EFW74V KGS → LGW Jun 16, 11:35 UTCJun 16, 15:20 UTC3h 45m
2026-06-16 EFW81W LGW → KGS Jun 16, 06:54 UTCJun 16, 10:15 UTC3h 20m
2026-06-15 EFW83SY RHO → LGW Jun 15, 18:25 UTCJun 15, 22:20 UTC3h 55m
2026-06-15 EFW147P LGW → RHO Jun 15, 13:30 UTCJun 15, 16:45 UTC3h 15m
2026-06-15 EFW64C - Jun 15, 09:25 UTCJun 15, 12:05 UTC2h 40m
2026-06-15 EFW2BZ - Jun 15, 05:25 UTCJun 15, 07:50 UTC2h 25m
2026-06-14 EFW811N OPO → LGW Jun 14, 20:50 UTCJun 14, 22:40 UTC1h 50m
2026-06-14 EFW568X LGW → OPO Jun 14, 17:45 UTCJun 14, 19:35 UTC1h 50m
2026-06-14 EFW6KJ FNC → LGW Jun 14, 12:40 UTCJun 14, 15:55 UTC3h 15m
2026-06-14 EFW527R - Jun 14, 11:10 UTCJun 14, 11:35 UTC25m
2026-06-14 EFW527R - Jun 14, 08:00 UTCJun 14, 10:25 UTC2h 25m
2026-06-13 EFW811N OPO → LGW Jun 13, 19:30 UTCJun 13, 21:15 UTC1h 45m
2026-06-13 EFW568X LGW → OPO Jun 13, 16:05 UTCJun 13, 18:05 UTC2h 0m
2026-06-13 EFW23SM PMI → LGW Jun 13, 12:10 UTCJun 13, 14:10 UTC2h 0m
2026-06-13 EFW74JG LGW → PMI Jun 13, 08:25 UTCJun 13, 10:25 UTC2h 0m
2026-06-12 EFW6RQ HER → LGW Jun 12, 19:20 UTCJun 12, 23:10 UTC3h 50m
2026-06-12 EFW5QL LGW → HER Jun 12, 14:15 UTCJun 12, 17:20 UTC3h 5m
2026-06-12 EFW5SL OPO → LGW Jun 12, 10:35 UTCJun 12, 12:30 UTC1h 55m
2026-06-12 EFW461M LGW → OPO Jun 12, 07:25 UTCJun 12, 09:20 UTC1h 55m
2026-06-11 EFW7SN - Jun 11, 18:40 UTCJun 11, 23:10 UTC4h 30m
2026-06-11 EFW39FL LGW → PFO Jun 11, 13:05 UTCJun 11, 17:10 UTC4h 5m
2026-06-10 EFW811N OPO → LGW Jun 10, 19:25 UTCJun 10, 21:20 UTC1h 55m
2026-06-10 EFW568X LGW → OPO Jun 10, 16:20 UTCJun 10, 18:05 UTC1h 45m
2026-06-10 EFW6RQ HER → LGW Jun 10, 11:10 UTCJun 10, 14:40 UTC3h 30m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the G-EUXG page for operator, model, and routing details .

Mode-S 400AFF frequently asked

What is Mode-S code 400AFF?
400AFF is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-EUXG.
Where is Mode-S 400AFF registered?
Mode-S code 400AFF is allocated to United Kingdom (GB). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 400AFF broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400AFF, octal 20005377, decimal 4,197,119.
What flights does 400AFF operate?
Mode-S 400AFF has broadcast 20 distinct callsigns, including EFW527R, EFW3MG, EFW22D, EFW9RZ, EFW12LS.