Apparatus

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sensors Mode-S transponder

40123F

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-EUUS · AIRBUS A-320

Hex
40123F
Octal
20011077
Decimal
4,198,975
Country
GB
Tail
G-EUUS
Type
A320
Broadcasting now · callsign BAW328 · 34,375 ft
Flights observed
240
Distinct callsigns
20
Country
GB
Last broadcast
7m ago

Current position

40123F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40123F 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
BAW785 British Airways 4 2026-05-10
BAW784 British Airways 4 2026-05-09
BAW490 British Airways 4 2026-04-24
BAW375 British Airways 4 2026-05-10
BAW374 British Airways 4 2026-05-10
BAW348K British Airways 4 2026-04-18
BAW787 - 3 2026-04-13
BAW491 British Airways 3 2026-04-23
BAW408 - 3 2026-04-13
BAW927E British Airways 2 2026-05-18
BAW8ER British Airways 2 2026-05-21
BAW879 British Airways 2 2026-04-16
BAW878 British Airways 2 2026-04-15
BAW875 - 2 2026-04-15
BAW874 British Airways 2 2026-04-15
BAW86S - 2 2026-04-14
BAW869 British Airways 2 2026-04-17
BAW865 British Airways 2 2026-04-21
BAW864 British Airways 2 2026-04-21
BAW860J - 2 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 BAW328 LHR → CDG May 30, 09:25 UTCMay 30, 09:45 UTC20m
2026-05-30 SHT17Q - May 30, 06:40 UTCMay 30, 08:00 UTC1h 20m
2026-05-29 SHT16H - May 29, 19:20 UTCMay 29, 20:20 UTC1h 0m
2026-05-29 BAW543Q BLQ → LHR May 29, 15:35 UTCMay 29, 17:20 UTC1h 45m
2026-05-29 BAW542W LHR → BLQ May 29, 11:50 UTCMay 29, 13:30 UTC1h 40m
2026-05-29 BAW301 CAI → LHR May 29, 09:20 UTCMay 29, 10:25 UTC1h 5m
2026-05-29 BAW30DG LHR → CDG May 29, 06:40 UTCMay 29, 07:25 UTC45m
2026-05-28 BAW997T BER → LHR May 28, 20:30 UTCMay 28, 21:50 UTC1h 20m
2026-05-28 BAW996G LHR → BER May 28, 18:05 UTCMay 28, 19:25 UTC1h 20m
2026-05-28 BAW30N CDG → LHR May 28, 15:20 UTCMay 28, 16:05 UTC45m
2026-05-28 BAW4DC LHR → CDG May 28, 13:00 UTCMay 28, 13:40 UTC40m
2026-05-28 BAW903 FRA → LHR May 28, 09:40 UTCMay 28, 10:55 UTC1h 15m
2026-05-28 BAW902N LHR → FRA May 28, 06:25 UTCMay 28, 07:35 UTC1h 10m
2026-05-27 BAW969H HAM → LHR May 27, 19:00 UTCMay 27, 20:20 UTC1h 20m
2026-05-27 BAW968 HAM → LHR May 27, 16:50 UTCMay 27, 18:00 UTC1h 10m
2026-05-27 BAW381 TIA → LHR May 27, 12:00 UTCMay 27, 14:45 UTC2h 45m
2026-05-27 BAW380 LHR → MRS May 27, 08:25 UTCMay 27, 10:40 UTC2h 15m
2026-05-27 BAW971 BER → LHR May 27, 04:49 UTCMay 27, 06:04 UTC1h 15m
2026-05-26 BAW970 LHR → HAJ May 26, 19:45 UTCMay 26, 20:50 UTC1h 5m
2026-05-26 BAW573 MXP → LHR May 26, 12:45 UTCMay 26, 14:20 UTC1h 35m
2026-05-26 BAW7LN LHR → LIN May 26, 09:59 UTCMay 26, 11:34 UTC1h 35m
2026-05-26 BAW765 INN → LHR May 26, 06:29 UTCMay 26, 07:49 UTC1h 20m
2026-05-25 BAW764 LHR → INN May 25, 19:35 UTCMay 25, 20:45 UTC1h 10m
2026-05-25 BAW5RF FCO → LHR May 25, 15:20 UTCMay 25, 17:20 UTC2h 0m
2026-05-25 BAW554R LHR → FCO May 25, 11:50 UTCMay 25, 13:50 UTC2h 0m
2026-05-25 BAW301 CAI → LHR May 25, 09:00 UTCMay 25, 09:55 UTC55m
2026-05-25 BAW30DG LHR → CDG May 25, 06:35 UTCMay 25, 07:15 UTC40m
2026-05-24 BAW607M PSA → LHR May 24, 20:00 UTCMay 24, 21:45 UTC1h 45m
2026-05-24 BAW606 LHR → PSA May 24, 17:05 UTCMay 24, 18:50 UTC1h 45m
2026-05-24 BAW655 CFU → LHR May 24, 11:30 UTCMay 24, 15:10 UTC3h 40m
2026-05-24 BAW654 LHR → CFU May 24, 06:30 UTCMay 24, 09:50 UTC3h 20m
2026-05-23 BAW383 GNB → LHR May 23, 17:45 UTCMay 23, 20:20 UTC2h 36m
2026-05-23 BAW382 LHR → MRS May 23, 13:50 UTCMay 23, 16:15 UTC2h 25m
2026-05-23 SHT17Y - May 23, 10:35 UTCMay 23, 11:50 UTC1h 15m
2026-05-23 SHT16C - May 23, 07:50 UTCMay 23, 09:05 UTC1h 15m
2026-05-23 BAW925 NUE → LHR May 23, 05:30 UTCMay 23, 06:35 UTC1h 5m
2026-05-22 BAW924 LHR → HAJ May 22, 19:00 UTCMay 22, 19:50 UTC50m
2026-05-22 BAW437Z AMS → LHR May 22, 16:15 UTCMay 22, 17:15 UTC1h 0m
2026-05-22 BAW3KG LHR → AMS May 22, 14:10 UTCMay 22, 15:00 UTC50m
2026-05-22 BAW475E BCN → LHR May 22, 10:35 UTCMay 22, 12:45 UTC2h 10m
2026-05-22 BAW474K LHR → BCN May 22, 07:30 UTCMay 22, 09:10 UTC1h 40m
2026-05-21 BAW333 NCE → LHR May 21, 18:10 UTCMay 21, 19:55 UTC1h 45m
2026-05-21 BAW332 LHR → NCE May 21, 15:15 UTCMay 21, 16:55 UTC1h 40m
2026-05-21 BAW8ER DUB → LHR May 21, 12:35 UTCMay 21, 13:35 UTC1h 0m
2026-05-21 BAW828Y LHR → DUB May 21, 10:00 UTCMay 21, 10:50 UTC50m
2026-05-21 BAW487E BCN → LHR May 21, 05:55 UTCMay 21, 07:55 UTC2h 0m
2026-05-20 BAW486 LHR → BCN May 20, 19:35 UTCMay 20, 21:10 UTC1h 35m
2026-05-20 BAW8RM BER → LHR May 20, 16:30 UTCMay 20, 18:15 UTC1h 45m
2026-05-20 BAW992G LHR → BER May 20, 12:45 UTCMay 20, 14:05 UTC1h 20m
2026-05-20 SHT7T GLA → LHR May 20, 09:50 UTCMay 20, 11:00 UTC1h 10m

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-EUUS page for operator, model, and routing details .

Mode-S 40123F frequently asked

What is Mode-S code 40123F?
40123F is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-EUUS.
Where is Mode-S 40123F registered?
Mode-S code 40123F 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 40123F broadcasting right now?
Yes. Mode-S 40123F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40123F, octal 20011077, decimal 4,198,975.
What flights does 40123F operate?
Mode-S 40123F has broadcast 20 distinct callsigns, including BAW785, BAW784, BAW490, BAW375, BAW374.