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 1h ago
Flights observed
133
Distinct callsigns
16
Country
GB
Last broadcast
1h 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
BAW6R - 10 2026-07-13
BAW56 - 10 2026-07-12
BAW55G - 10 2026-07-16
BAW54 British Airways 10 2026-07-17
BAW3G - 10 2026-07-13
BAW5E British Airways 9 2026-05-17
BAW57K - 9 2026-07-11
BAW34N British Airways 9 2026-05-18
BAW8K - 8 2026-07-11
BAW7D - 8 2026-07-15
BAW4E - 8 2026-07-16
BAW193 - 8 2026-07-10
BAW5L - 7 2026-07-14
BAW2X - 7 2026-07-15
BAW213 British Airways 5 2026-06-20
BAW212 - 5 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 BAW54 JNB → LHR Jul 17, 19:30 UTCJul 18, 06:00 UTC10h 31m
2026-07-16 BAW55G - Jul 16, 19:10 UTCJul 17, 05:10 UTC10h 0m
2026-07-16 BAW4E - Jul 16, 04:20 UTCJul 16, 14:15 UTC9h 55m
2026-07-15 BAW7D - Jul 15, 14:30 UTCJul 16, 01:15 UTC10h 45m
2026-07-15 BAW2X SFO → LHR Jul 15, 00:10 UTCJul 15, 09:50 UTC9h 40m
2026-07-14 BAW5L - Jul 14, 10:20 UTCJul 14, 20:50 UTC10h 30m
2026-07-13 BAW6R - Jul 13, 21:20 UTCJul 14, 05:20 UTC8h 0m
2026-07-13 BAW3G - Jul 13, 09:25 UTCJul 13, 18:05 UTC8h 40m
2026-07-12 BAW56 - Jul 12, 17:40 UTCJul 13, 04:15 UTC10h 35m
2026-07-11 BAW57K - Jul 11, 20:55 UTCJul 12, 07:05 UTC10h 10m
2026-07-11 BAW8K DFW → LHR Jul 11, 00:55 UTCJul 11, 09:35 UTC8h 40m
2026-07-10 BAW193 LHR → DFW Jul 10, 12:35 UTCJul 10, 22:05 UTC9h 31m
2026-07-09 BAW54 - Jul 9, 19:35 UTCJul 10, 06:05 UTC10h 30m
2026-07-08 BAW57K - Jul 8, 20:55 UTCJul 9, 07:15 UTC10h 20m
2026-07-08 BAW4E - Jul 8, 05:50 UTCJul 8, 15:25 UTC9h 35m
2026-07-07 BAW7D EWR → LHR Jul 7, 16:40 UTCJul 8, 03:15 UTC10h 35m
2026-07-07 BAW2X - Jul 7, 00:05 UTCJul 7, 09:30 UTC9h 25m
2026-07-06 BAW5L LHR → SFO Jul 6, 10:15 UTCJul 6, 20:50 UTC10h 35m
2026-07-05 BAW54 - Jul 5, 19:40 UTCJul 6, 06:15 UTC10h 35m
2026-07-04 BAW57K LHR → JNB Jul 4, 21:20 UTCJul 5, 07:25 UTC10h 5m
2026-07-03 BAW6R - Jul 3, 21:25 UTCJul 4, 05:40 UTC8h 15m
2026-07-03 BAW3G LHR → BOS Jul 3, 09:45 UTCJul 3, 18:20 UTC8h 35m
2026-07-01 BAW2X SFO → LHR Jul 1, 00:05 UTCJul 1, 09:30 UTC9h 25m
2026-06-30 BAW5L LHR → SFO Jun 30, 10:30 UTCJun 30, 20:35 UTC10h 5m
2026-06-29 BAW6R - Jun 29, 21:30 UTCJun 30, 05:20 UTC7h 51m
2026-06-29 BAW3G LHR → BOS Jun 29, 09:34 UTCJun 29, 18:30 UTC8h 55m
2026-06-28 BAW56 JNB → LHR Jun 28, 18:00 UTCJun 29, 04:30 UTC10h 30m
2026-06-27 BAW55G LHR → JNB Jun 27, 19:05 UTCJun 28, 05:15 UTC10h 10m
2026-06-27 BAW8K DFW → LHR Jun 27, 01:59 UTCJun 27, 10:25 UTC8h 25m
2026-06-26 BAW193 - Jun 26, 13:45 UTCJun 26, 23:00 UTC9h 15m
2026-06-25 BAW6R - Jun 25, 21:50 UTCJun 26, 05:44 UTC7h 55m
2026-06-25 BAW3G LHR → BOS Jun 25, 09:29 UTCJun 25, 18:15 UTC8h 45m
2026-06-23 BAW56 JNB → LHR Jun 23, 18:10 UTCJun 24, 04:34 UTC10h 25m
2026-06-22 BAW57K LHR → JNB Jun 22, 21:00 UTCJun 23, 07:55 UTC10h 55m
2026-06-21 BAW2X SFO → LHR Jun 21, 23:59 UTCJun 22, 09:30 UTC9h 30m
2026-06-21 BAW5L LHR → SFO Jun 21, 10:25 UTCJun 21, 20:34 UTC10h 10m
2026-06-21 BAW212 BOS → LHR Jun 21, 00:19 UTCJun 21, 06:14 UTC5h 55m
2026-06-20 BAW213 LHR → BOS Jun 20, 14:14 UTCJun 20, 20:49 UTC6h 35m
2026-06-19 BAW54 - Jun 19, 19:34 UTCJun 20, 06:10 UTC10h 35m
2026-06-18 BAW55G LHR → JNB Jun 18, 18:35 UTCJun 19, 04:44 UTC10h 9m
2026-06-18 BAW8K DFW → LHR Jun 18, 03:00 UTCJun 18, 11:35 UTC8h 35m
2026-06-17 BAW193 - Jun 17, 14:35 UTCJun 17, 23:50 UTC9h 15m
2026-06-16 BAW6R - Jun 16, 21:30 UTCJun 17, 05:20 UTC7h 50m
2026-06-16 BAW3G LHR → BOS Jun 16, 09:30 UTCJun 16, 18:25 UTC8h 55m
2026-06-15 BAW6R - Jun 15, 21:35 UTCJun 16, 05:34 UTC8h 0m
2026-06-15 BAW3G LHR → BOS Jun 15, 09:35 UTCJun 15, 18:15 UTC8h 40m
2026-06-14 BAW4E - Jun 14, 04:20 UTCJun 14, 14:15 UTC9h 55m
2026-06-13 BAW7D EWR → LHR Jun 13, 15:00 UTCJun 14, 01:10 UTC10h 10m
2026-06-13 BAW8K DFW → LHR Jun 13, 01:35 UTCJun 13, 10:10 UTC8h 34m
2026-06-12 BAW193 LHR → DFW Jun 12, 12:45 UTCJun 12, 22:05 UTC9h 20m

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 1h 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 BAW6R, BAW56, BAW55G, BAW54, BAW3G.