Apparatus

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sensors Mode-S transponder

405BFE

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-YMMU · BOEING 777-200

Hex
405BFE
Octal
20055776
Decimal
4,217,854
Country
GB
Tail
G-YMMU
Type
B772
No current signal · last broadcast 6h ago
Flights observed
197
Distinct callsigns
20
Country
GB
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 405BFE.

Country allocation

The ICAO 24-bit address 405BFE 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
BAW118 British Airways 14 2026-05-31
BAW276 - 12 2026-07-12
BAW88C - 10 2026-07-04
BAW5VY - 10 2026-07-03
BAW22B - 10 2026-07-07
BAW248 - 9 2026-07-09
BAW135 - 9 2026-06-24
BAW2LJ - 8 2026-07-08
BAW134 - 8 2026-06-25
BAW291 - 7 2026-06-17
BAW290 - 7 2026-06-17
BAW249 - 7 2026-07-09
BAW265 - 6 2026-07-10
BAW264 - 6 2026-07-11
BAW199 British Airways 6 2026-05-27
BAW198 British Airways 6 2026-05-28
BAW120 - 6 2026-07-01
BAW119 British Airways 6 2026-05-30
BAW21V - 5 2026-06-30
BAW143 British Airways 5 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 BAW277 - Jul 13, 15:50 UTCJul 13, 23:40 UTC7h 50m
2026-07-12 BAW276 - Jul 12, 17:35 UTCJul 13, 12:35 UTC19h 0m
2026-07-12 BAW276 - Jul 12, 15:35 UTCJul 13, 12:35 UTC21h 0m
2026-07-12 BAW276 LHR → LHR Jul 12, 15:01 UTCJul 13, 12:35 UTC21h 35m
2026-07-12 BAW86 - Jul 12, 01:40 UTCJul 12, 10:20 UTC8h 40m
2026-07-11 BAW87 LHR → YVR Jul 11, 14:00 UTCJul 11, 23:25 UTC9h 25m
2026-07-11 BAW264 - Jul 11, 00:10 UTCJul 11, 10:10 UTC10h 0m
2026-07-10 BAW265 LHR → SAN Jul 10, 11:05 UTCJul 10, 21:45 UTC10h 40m
2026-07-09 BAW248 - Jul 9, 20:05 UTCJul 10, 06:45 UTC10h 40m
2026-07-09 BAW248 - Jul 9, 15:30 UTCJul 9, 17:50 UTC2h 20m
2026-07-09 BAW249 - Jul 9, 10:25 UTCJul 9, 13:15 UTC2h 50m
2026-07-08 BAW249 - Jul 8, 21:20 UTCJul 9, 08:05 UTC10h 45m
2026-07-08 BAW461 - Jul 8, 16:00 UTCJul 8, 17:40 UTC1h 40m
2026-07-08 BAW46EZ - Jul 8, 11:40 UTCJul 8, 13:25 UTC1h 45m
2026-07-08 BAW2LJ BWI → LHR Jul 8, 01:45 UTCJul 8, 08:45 UTC7h 0m
2026-07-07 BAW22B - Jul 7, 15:50 UTCJul 7, 23:10 UTC7h 20m
2026-07-06 BAW276 - Jul 6, 17:35 UTCJul 7, 12:35 UTC19h 0m
2026-07-06 BAW276 - Jul 6, 15:35 UTCJul 7, 12:35 UTC21h 0m
2026-07-06 BAW276 LHR → LHR Jul 6, 15:05 UTCJul 7, 12:35 UTC21h 30m
2026-07-06 BAW2LJ BWI → LHR Jul 6, 04:55 UTCJul 6, 11:40 UTC6h 45m
2026-07-05 BAW22B - Jul 5, 16:00 UTCJul 5, 23:35 UTC7h 35m
2026-07-05 BAW51B BOS → LHR Jul 5, 04:25 UTCJul 5, 10:05 UTC5h 40m
2026-07-04 BAW50G - Jul 4, 17:00 UTCJul 5, 00:10 UTC7h 10m
2026-07-04 BAW88C YVR → LHR Jul 4, 04:20 UTCJul 4, 13:00 UTC8h 40m
2026-07-03 BAW5VY - Jul 3, 16:45 UTCJul 4, 02:05 UTC9h 20m
2026-07-03 BAW88C YVR → LHR Jul 3, 04:15 UTCJul 3, 12:45 UTC8h 30m
2026-07-02 BAW5VY LHR → YVR Jul 2, 16:45 UTCJul 3, 01:55 UTC9h 10m
2026-07-02 BAW88C YVR → LHR Jul 2, 04:15 UTCJul 2, 12:55 UTC8h 40m
2026-07-01 BAW5VY LHR → YVR Jul 1, 17:05 UTCJul 2, 02:00 UTC8h 55m
2026-07-01 BAW120 - Jul 1, 02:35 UTCJul 1, 09:55 UTC7h 20m
2026-06-30 BAW21V - Jun 30, 14:25 UTCJun 30, 22:25 UTC8h 0m
2026-06-30 BAW264 SAN → LHR Jun 30, 00:00 UTCJun 30, 09:50 UTC9h 51m
2026-06-29 BAW265 - Jun 29, 11:04 UTCJun 29, 21:34 UTC10h 30m
2026-06-29 BAW64 - Jun 29, 01:10 UTCJun 29, 05:45 UTC4h 35m
2026-06-28 BAW65 - Jun 28, 10:19 UTCJun 28, 13:40 UTC3h 20m
2026-06-26 BAW62 EBB → LHR Jun 26, 13:19 UTCJun 26, 15:34 UTC2h 15m
2026-06-25 BAW63 LHR → EBB Jun 25, 19:09 UTCJun 25, 23:19 UTC4h 10m
2026-06-25 BAW134 - Jun 25, 05:29 UTCJun 25, 14:55 UTC9h 25m
2026-06-24 BAW135 - Jun 24, 18:15 UTCJun 25, 03:10 UTC8h 55m
2026-06-24 BAW134 - Jun 24, 05:15 UTCJun 24, 14:34 UTC9h 20m
2026-06-24 BAW135 - Jun 24, 02:49 UTCJun 24, 03:04 UTC15m
2026-06-23 BAW135 - Jun 23, 18:20 UTCJun 24, 02:00 UTC7h 40m
2026-06-23 BAW264 - Jun 23, 00:15 UTCJun 23, 10:15 UTC10h 0m
2026-06-22 BAW265 LHR → SAN Jun 22, 11:19 UTCJun 22, 21:54 UTC10h 35m
2026-06-21 BAW248 - Jun 21, 20:09 UTCJun 22, 07:10 UTC11h 0m
2026-06-21 BAW248 EZE → GIG Jun 21, 15:25 UTCJun 21, 18:00 UTC2h 35m
2026-06-21 BAW248 - Jun 21, 10:14 UTCJun 21, 13:24 UTC3h 10m
2026-06-20 BAW249 - Jun 20, 21:25 UTCJun 21, 08:20 UTC10h 55m
2026-06-20 BAW461 MAD → LHR Jun 20, 16:14 UTCJun 20, 17:59 UTC1h 45m
2026-06-20 BAW46EZ - Jun 20, 11:49 UTCJun 20, 13:34 UTC1h 45m

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

Mode-S 405BFE frequently asked

What is Mode-S code 405BFE?
405BFE is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-YMMU.
Where is Mode-S 405BFE registered?
Mode-S code 405BFE 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 405BFE 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 405BFE, octal 20055776, decimal 4,217,854.
What flights does 405BFE operate?
Mode-S 405BFE has broadcast 20 distinct callsigns, including BAW118, BAW276, BAW88C, BAW5VY, BAW22B.