Apparatus

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sensors Mode-S transponder

406B21

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-XLEH · AIRBUS A-380-800

Hex
406B21
Octal
20065441
Decimal
4,221,729
Country
GB
Tail
G-XLEH
Type
A388
No current signal · last broadcast 6h ago
Flights observed
70
Distinct callsigns
16
Country
GB
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 406B21.

Country allocation

The ICAO 24-bit address 406B21 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 16 distinct

Callsign Airline Flights Last seen
BAW5E British Airways 9 2026-05-17
BAW34N British Airways 9 2026-05-18
BAW56 British Airways 6 2026-05-27
BAW55G British Airways 6 2026-06-02
BAW6R British Airways 4 2026-05-22
BAW57K British Airways 4 2026-05-03
BAW54 British Airways 4 2026-05-29
BAW3G British Airways 4 2026-05-22
BAW213 British Airways 4 2026-06-01
BAW212 British Airways 4 2026-06-02
BAW8K British Airways 3 2026-05-31
BAW7D British Airways 3 2026-05-07
BAW4E British Airways 3 2026-05-08
BAW193 British Airways 3 2026-05-30
BAW5L British Airways 2 2026-05-12
BAW2X British Airways 2 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 BAW55G LHR → JNB Jun 2, 19:20 UTCJun 2, 21:15 UTC1h 55m
2026-06-02 BAW212 BOS → LHR Jun 2, 00:40 UTCJun 2, 06:20 UTC5h 40m
2026-06-01 BAW213 LHR → BOS Jun 1, 14:40 UTCJun 1, 21:05 UTC6h 25m
2026-06-01 BAW212 BOS → LHR Jun 1, 00:40 UTCJun 1, 06:20 UTC5h 40m
2026-05-31 BAW213 LHR → BOS May 31, 14:20 UTCMay 31, 20:45 UTC6h 25m
2026-05-31 BAW8K DFW → LHR May 31, 08:55 UTCMay 31, 10:20 UTC1h 25m
2026-05-30 BAW193 LHR → DFW May 30, 12:45 UTCMay 30, 21:40 UTC8h 55m
2026-05-29 BAW54 JNB → LHR May 29, 19:25 UTCMay 30, 06:10 UTC10h 45m
2026-05-28 BAW55G LHR → JNB May 28, 19:10 UTCMay 29, 05:25 UTC10h 15m
2026-05-27 BAW56 JNB → LHR May 27, 18:20 UTCMay 28, 04:55 UTC10h 35m
2026-05-26 BAW55G LHR → JNB May 26, 21:14 UTCMay 27, 07:40 UTC10h 25m
2026-05-26 BAW8K DFW → LHR May 26, 02:29 UTCMay 26, 11:00 UTC8h 30m
2026-05-25 BAW193 LHR → DFW May 25, 13:10 UTCMay 25, 23:10 UTC9h 59m
2026-05-25 BAW212 BOS → LHR May 25, 04:40 UTCMay 25, 06:10 UTC1h 30m
2026-05-24 BAW213 LHR → BOS May 24, 14:00 UTCMay 24, 20:55 UTC6h 55m
2026-05-24 BAW8K DFW → LHR May 24, 01:30 UTCMay 24, 09:55 UTC8h 25m
2026-05-23 BAW193 LHR → DFW May 23, 12:35 UTCMay 23, 22:05 UTC9h 30m
2026-05-22 BAW6R MIA → LHR May 22, 21:40 UTCMay 23, 05:25 UTC7h 44m
2026-05-22 BAW3G LHR → BOS May 22, 10:05 UTCMay 22, 18:55 UTC8h 50m
2026-05-18 BAW34N MIA → LHR May 18, 03:20 UTCMay 18, 11:20 UTC8h 0m
2026-05-17 BAW5E LHR → MIA May 17, 16:01 UTCMay 18, 00:45 UTC8h 45m
2026-05-17 BAW34N MIA → LHR May 17, 04:40 UTCMay 17, 12:15 UTC7h 35m
2026-05-16 BAW5E LHR → MIA May 16, 17:05 UTCMay 17, 02:05 UTC9h 0m
2026-05-16 BAW34N MIA → LHR May 16, 06:06 UTCMay 16, 13:25 UTC7h 20m
2026-05-15 BAW5E LHR → MIA May 15, 18:10 UTCMay 16, 02:50 UTC8h 40m
2026-05-15 BAW34N MIA → LHR May 15, 04:55 UTCMay 15, 12:15 UTC7h 20m
2026-05-14 BAW5E LHR → MIA May 14, 17:05 UTCMay 15, 02:20 UTC9h 15m
2026-05-14 BAW34N MIA → LHR May 14, 04:15 UTCMay 14, 12:10 UTC7h 55m
2026-05-13 BAW5E LHR → MIA May 13, 16:40 UTCMay 14, 01:40 UTC9h 0m
2026-05-13 BAW2X SFO → LHR May 13, 00:10 UTCMay 13, 09:55 UTC9h 45m
2026-05-12 BAW5L LHR → SFO May 12, 10:25 UTCMay 12, 21:01 UTC10h 35m
2026-05-11 BAW54 JNB → LHR May 11, 19:40 UTCMay 12, 06:25 UTC10h 45m
2026-05-10 BAW55G LHR → JNB May 10, 18:25 UTCMay 11, 04:25 UTC10h 0m
2026-05-09 BAW54 JNB → LHR May 9, 19:19 UTCMay 10, 06:15 UTC10h 55m
2026-05-08 BAW55G LHR → JNB May 8, 18:40 UTCMay 9, 04:50 UTC10h 10m
2026-05-08 BAW4E LAX → LHR May 8, 04:09 UTCMay 8, 14:15 UTC10h 5m
2026-05-07 BAW7D EWR → LHR May 7, 14:35 UTCMay 8, 00:49 UTC10h 15m
2026-05-06 BAW2X SFO → LHR May 6, 23:50 UTCMay 7, 09:45 UTC9h 55m
2026-05-06 BAW5L LHR → SFO May 6, 10:05 UTCMay 6, 20:30 UTC10h 24m
2026-05-06 BAW212 BOS → LHR May 6, 00:01 UTCMay 6, 06:00 UTC6h 0m
2026-05-05 BAW213 LHR → BOS May 5, 13:45 UTCMay 5, 20:25 UTC6h 40m
2026-05-04 BAW56 JNB → LHR May 4, 17:50 UTCMay 5, 04:25 UTC10h 36m
2026-05-03 BAW57K LHR → JNB May 3, 20:55 UTCMay 4, 07:30 UTC10h 35m
2026-05-02 BAW6R MIA → LHR May 2, 22:40 UTCMay 3, 06:35 UTC7h 54m
2026-05-02 BAW3G LHR → BOS May 2, 10:00 UTCMay 2, 19:15 UTC9h 15m
2026-04-30 BAW4E LAX → LHR Apr 30, 06:50 UTCApr 30, 16:20 UTC9h 30m
2026-04-29 BAW7D EWR → LHR Apr 29, 17:30 UTCApr 30, 03:50 UTC10h 19m
2026-04-29 BAW34N MIA → LHR Apr 29, 03:10 UTCApr 29, 11:25 UTC8h 15m
2026-04-28 BAW5E LHR → MIA Apr 28, 15:10 UTCApr 29, 00:00 UTC8h 50m
2026-04-28 BAW34N MIA → LHR Apr 28, 02:50 UTCApr 28, 11:15 UTC8h 25m

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

Mode-S 406B21 frequently asked

What is Mode-S code 406B21?
406B21 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-XLEH.
Where is Mode-S 406B21 registered?
Mode-S code 406B21 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 406B21 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406B21, octal 20065441, decimal 4,221,729.
What flights does 406B21 operate?
Mode-S 406B21 has broadcast 16 distinct callsigns, including BAW5E, BAW34N, BAW56, BAW55G, BAW6R.