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 BAW499 · 36,025 ft
Flights observed
511
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 20:45 UTC

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
BAW8ER British Airways 5 2026-07-26
BAW828Y British Airways 5 2026-07-26
BAW490 - 5 2026-06-27
SHT1480 - 4 2026-07-21
BAW994 - 4 2026-07-10
BAW826 - 4 2026-07-20
BAW785 British Airways 4 2026-05-10
BAW784 British Airways 4 2026-05-09
BAW491 - 4 2026-06-27
BAW42DB British Airways 4 2026-07-20
BAW408 - 4 2026-06-30
BAW375 British Airways 4 2026-05-10
BAW374 British Airways 4 2026-05-10
BAW348K British Airways 4 2026-04-18
SHT7Z - 3 2026-07-21
SHT7B - 3 2026-07-17
SHT6U - 3 2026-07-16
SHT6C - 3 2026-07-20
SHT1481 - 3 2026-07-21
BAW995 - 3 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 BAW517 OPO → LHR Jul 26, 18:20 UTCJul 26, 20:45 UTC2h 25m
2026-07-26 BAW516 LHR → FCO Jul 26, 14:55 UTCJul 26, 17:10 UTC2h 15m
2026-07-26 BAW8ER DUB → LHR Jul 26, 12:25 UTCJul 26, 13:15 UTC50m
2026-07-26 BAW828Y LHR → DUB Jul 26, 09:55 UTCJul 26, 10:50 UTC55m
2026-07-26 BAW859 PRG → LHR Jul 26, 05:00 UTCJul 26, 06:55 UTC1h 56m
2026-07-25 BAW858V LHR → PRG Jul 25, 19:50 UTCJul 25, 21:20 UTC1h 30m
2026-07-25 BAW625 DUS → LHR Jul 25, 16:10 UTCJul 25, 18:35 UTC2h 25m
2026-07-25 BAW624 LHR → RHO Jul 25, 10:35 UTCJul 25, 13:10 UTC2h 35m
2026-07-25 BAW825 PRG → LHR Jul 25, 08:10 UTCJul 25, 09:00 UTC50m
2026-07-25 BAW82DM LHR → DUB Jul 25, 06:00 UTCJul 25, 06:50 UTC50m
2026-07-24 BAW647 EFL → LHR Jul 24, 17:10 UTCJul 24, 19:50 UTC2h 40m
2026-07-24 BAW646 LHR → EFL Jul 24, 12:35 UTCJul 24, 14:55 UTC2h 20m
2026-07-24 BAW41R AMS → LHR Jul 24, 09:45 UTCJul 24, 10:35 UTC50m
2026-07-24 BAW430A LHR → AMS Jul 24, 07:50 UTCJul 24, 08:35 UTC45m
2026-07-23 BAW617 PEG → LHR Jul 23, 19:25 UTCJul 23, 21:05 UTC1h 40m
2026-07-23 BAW616 PEG → LHR Jul 23, 16:25 UTCJul 23, 18:00 UTC1h 35m
2026-07-23 BAW381 TIA → LHR Jul 23, 12:00 UTCJul 23, 14:30 UTC2h 30m
2026-07-23 BAW380 LHR → MRS Jul 23, 07:50 UTCJul 23, 10:00 UTC2h 10m
2026-07-23 SHT13Z NCL → LHR Jul 23, 05:15 UTCJul 23, 06:10 UTC55m
2026-07-22 SHT12U - Jul 22, 20:05 UTCJul 22, 20:50 UTC45m
2026-07-22 BAW333 NCE → LHR Jul 22, 17:00 UTCJul 22, 18:45 UTC1h 45m
2026-07-22 BAW332 LHR → NCE Jul 22, 13:55 UTCJul 22, 15:25 UTC1h 30m
2026-07-22 BAW501 - Jul 22, 10:20 UTCJul 22, 12:15 UTC1h 55m
2026-07-21 BAW969H HAM → LHR Jul 21, 19:30 UTCJul 21, 20:40 UTC1h 10m
2026-07-21 BAW968 - Jul 21, 15:15 UTCJul 21, 16:25 UTC1h 10m
2026-07-21 SHT7Z GLA → LHR Jul 21, 12:05 UTCJul 21, 13:05 UTC1h 0m
2026-07-21 SHT1480 LGW → GLA Jul 21, 09:35 UTCJul 21, 10:35 UTC1h 0m
2026-07-21 SHT1481 GLA → LGW Jul 21, 06:55 UTCJul 21, 08:10 UTC1h 15m
2026-07-20 SHT6C - Jul 20, 18:10 UTCJul 20, 19:10 UTC1h 0m
2026-07-20 SHT17L - Jul 20, 15:45 UTCJul 20, 16:50 UTC1h 5m
2026-07-20 SHT16E - Jul 20, 13:05 UTCJul 20, 14:15 UTC1h 10m
2026-07-20 BAW42DB DUB → LHR Jul 20, 10:10 UTCJul 20, 11:15 UTC1h 5m
2026-07-20 BAW826 - Jul 20, 07:30 UTCJul 20, 08:20 UTC50m
2026-07-19 BAW80W CPH → LHR Jul 19, 19:50 UTCJul 19, 21:05 UTC1h 15m
2026-07-19 BAW808 - Jul 19, 17:35 UTCJul 19, 18:55 UTC1h 20m
2026-07-19 BAW645 KLX → LHR Jul 19, 13:05 UTCJul 19, 16:00 UTC2h 55m
2026-07-19 BAW644 - Jul 19, 07:45 UTCJul 19, 10:05 UTC2h 20m
2026-07-18 BAW613 PSA → LHR Jul 18, 17:55 UTCJul 18, 19:45 UTC1h 50m
2026-07-18 BAW612 LHR → VCE Jul 18, 14:40 UTCJul 18, 16:15 UTC1h 35m
2026-07-18 SHT13C NCL → LHR Jul 18, 09:15 UTCJul 18, 10:10 UTC55m
2026-07-18 SHT12H LHR → NCL Jul 18, 07:10 UTCJul 18, 07:55 UTC45m
2026-07-17 BAW603 PSA → LHR Jul 17, 18:44 UTCJul 17, 20:29 UTC1h 45m
2026-07-17 BAW602 LHR → PSA Jul 17, 15:55 UTCJul 17, 17:25 UTC1h 30m
2026-07-17 BAW747 - Jul 17, 12:19 UTCJul 17, 13:29 UTC1h 10m
2026-07-17 BAW746G LHR → GVA Jul 17, 10:05 UTCJul 17, 11:15 UTC1h 10m
2026-07-17 SHT7B - Jul 17, 06:05 UTCJul 17, 07:05 UTC1h 0m
2026-07-16 SHT6U - Jul 16, 21:30 UTCJul 16, 22:25 UTC55m
2026-07-16 SHT9B - Jul 16, 18:25 UTCJul 16, 19:20 UTC55m
2026-07-16 SHT8R - Jul 16, 16:25 UTCJul 16, 17:20 UTC55m
2026-07-16 SHT3B MAN → LHR Jul 16, 13:40 UTCJul 16, 14:10 UTC30m

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 BAW8ER, BAW828Y, BAW490, SHT1480, BAW994.