Apparatus

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sensors Mode-S transponder

40838D

ICAO 24-bit transponder address · allocated to United Kingdom

Hex
40838D
Octal
20101615
Decimal
4,227,981
Country
GB
Broadcasting now · callsign BAW520R · 39,050 ft
Flights observed
63
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 21:10 UTC

Current position

40838D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40838D 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
BAW491 British Airways 3 2026-07-26
BAW490 British Airways 3 2026-07-26
BAW851 - 2 2026-07-20
BAW850T British Airways 2 2026-07-20
BAW795 British Airways 2 2026-07-19
BAW794 - 2 2026-07-19
BAW347N British Airways 2 2026-07-21
BAW346 - 2 2026-07-21
SHT22A - 1 2026-07-14
SHT21B - 1 2026-07-14
BAW9250 - 1 2026-07-10
BAW911U - 1 2026-07-15
BAW910N - 1 2026-07-14
BAW893 British Airways 1 2026-07-26
BAW892 British Airways 1 2026-07-26
BAW879 - 1 2026-07-17
BAW878 - 1 2026-07-16
BAW873 British Airways 1 2026-07-25
BAW872 British Airways 1 2026-07-25
BAW871 British Airways 1 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 BAW893 SOF → LHR Jul 26, 18:20 UTCJul 26, 21:10 UTC2h 50m
2026-07-26 BAW892 LHR → SOF Jul 26, 14:15 UTCJul 26, 16:35 UTC2h 20m
2026-07-26 BAW491 GIB → LHR Jul 26, 09:50 UTCJul 26, 12:25 UTC2h 35m
2026-07-26 BAW490 LHR → GIB Jul 26, 06:15 UTCJul 26, 08:25 UTC2h 11m
2026-07-25 BAW873 KRK → LHR Jul 25, 20:05 UTCJul 25, 22:10 UTC2h 5m
2026-07-25 BAW872 LHR → KRK Jul 25, 16:55 UTCJul 25, 19:00 UTC2h 5m
2026-07-25 BAW491 GIB → LHR Jul 25, 11:20 UTCJul 25, 13:40 UTC2h 20m
2026-07-25 BAW490 LHR → GIB Jul 25, 07:45 UTCJul 25, 10:10 UTC2h 25m
2026-07-24 BAW869 BUD → LHR Jul 24, 17:55 UTCJul 24, 20:00 UTC2h 5m
2026-07-24 BAW68H LHR → BUD Jul 24, 14:40 UTCJul 24, 16:35 UTC1h 55m
2026-07-24 BAW491 GIB → LHR Jul 24, 10:15 UTCJul 24, 12:30 UTC2h 15m
2026-07-24 BAW490 LHR → GIB Jul 24, 06:15 UTCJul 24, 08:45 UTC2h 30m
2026-07-23 BAW34V PRG → LHR Jul 23, 19:45 UTCJul 23, 21:15 UTC1h 30m
2026-07-23 BAW856Z LHR → PRG Jul 23, 17:05 UTCJul 23, 18:35 UTC1h 30m
2026-07-23 BAW865 BUD → LHR Jul 23, 13:35 UTCJul 23, 15:45 UTC2h 10m
2026-07-23 BAW864 LHR → BUD Jul 23, 10:05 UTCJul 23, 12:15 UTC2h 10m
2026-07-23 BAW871 BUD → LHR Jul 23, 05:45 UTCJul 23, 08:10 UTC2h 25m
2026-07-22 BAW870 - Jul 22, 20:45 UTCJul 22, 22:40 UTC1h 55m
2026-07-22 BAW867 BUD → LHR Jul 22, 16:50 UTCJul 22, 19:05 UTC2h 15m
2026-07-22 BAW866H - Jul 22, 14:00 UTCJul 22, 15:55 UTC1h 55m
2026-07-21 BAW783C OSL → LHR Jul 21, 17:45 UTCJul 21, 19:40 UTC1h 55m
2026-07-21 BAW782F - Jul 21, 14:50 UTCJul 21, 16:40 UTC1h 50m
2026-07-21 BAW347N NCE → LHR Jul 21, 11:15 UTCJul 21, 12:45 UTC1h 30m
2026-07-21 BAW346 - Jul 21, 08:20 UTCJul 21, 09:45 UTC1h 25m
2026-07-21 BAW859 PRG → LHR Jul 21, 04:50 UTCJul 21, 06:25 UTC1h 35m
2026-07-20 BAW858V - Jul 20, 20:20 UTCJul 20, 21:50 UTC1h 30m
2026-07-20 BAW493U GIB → LHR Jul 20, 15:35 UTCJul 20, 18:10 UTC2h 35m
2026-07-20 BAW492 - Jul 20, 12:10 UTCJul 20, 14:35 UTC2h 25m
2026-07-20 BAW851 PRG → LHR Jul 20, 08:45 UTCJul 20, 10:40 UTC1h 55m
2026-07-20 BAW850T LHR → WAW Jul 20, 05:50 UTCJul 20, 07:25 UTC1h 35m
2026-07-19 BAW795 GOT → LHR Jul 19, 19:45 UTCJul 19, 21:40 UTC1h 55m
2026-07-19 BAW794 - Jul 19, 16:40 UTCJul 19, 18:20 UTC1h 40m
2026-07-19 BAW853S PRG → LHR Jul 19, 13:25 UTCJul 19, 15:15 UTC1h 50m
2026-07-19 BAW852 LHR → PRG Jul 19, 10:20 UTCJul 19, 11:50 UTC1h 30m
2026-07-19 BAW785 LHR → ARN Jul 19, 06:10 UTCJul 19, 08:00 UTC1h 50m
2026-07-18 BAW784 - Jul 18, 19:15 UTCJul 18, 20:55 UTC1h 40m
2026-07-18 BAW351 - Jul 18, 16:15 UTCJul 18, 17:50 UTC1h 35m
2026-07-18 BAW35R LHR → MRS Jul 18, 13:35 UTCJul 18, 15:00 UTC1h 25m
2026-07-18 BAW851 PRG → LHR Jul 18, 09:40 UTCJul 18, 11:20 UTC1h 40m
2026-07-18 BAW850T LHR → WAW Jul 18, 06:25 UTCJul 18, 07:50 UTC1h 25m
2026-07-17 BAW795 - Jul 17, 20:04 UTCJul 17, 22:10 UTC2h 5m
2026-07-17 BAW794 - Jul 17, 17:35 UTCJul 17, 19:15 UTC1h 40m
2026-07-17 BAW347N NCE → LHR Jul 17, 13:29 UTCJul 17, 15:10 UTC1h 40m
2026-07-17 BAW346 - Jul 17, 10:35 UTCJul 17, 12:10 UTC1h 35m
2026-07-17 BAW879 - Jul 17, 05:25 UTCJul 17, 08:40 UTC3h 15m
2026-07-16 BAW878 - Jul 16, 19:25 UTCJul 16, 22:05 UTC2h 40m
2026-07-16 BAW86S PRG → LHR Jul 16, 15:30 UTCJul 16, 17:14 UTC1h 45m
2026-07-16 BAW860J LHR → PRG Jul 16, 12:55 UTCJul 16, 14:20 UTC1h 25m
2026-07-16 BAW745 - Jul 16, 09:40 UTCJul 16, 11:15 UTC1h 35m
2026-07-16 BAW744 - Jul 16, 07:10 UTCJul 16, 08:15 UTC1h 5m

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.

Mode-S 40838D frequently asked

What is Mode-S code 40838D?
40838D is an ICAO 24-bit transponder address. Allocated to United Kingdom.
Where is Mode-S 40838D registered?
Mode-S code 40838D 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 40838D broadcasting right now?
Yes. Mode-S 40838D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40838D, octal 20101615, decimal 4,227,981.
What flights does 40838D operate?
Mode-S 40838D has broadcast 20 distinct callsigns, including BAW491, BAW490, BAW851, BAW850T, BAW795.