Apparatus

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sensors Mode-S transponder

405BFB

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-YMMR · BOEING 777-200

Hex
405BFB
Octal
20055773
Decimal
4,217,851
Country
GB
Tail
G-YMMR
Type
B772
No current signal · last broadcast 13d ago
Flights observed
199
Distinct callsigns
20
Country
GB
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S 405BFB.

Country allocation

The ICAO 24-bit address 405BFB 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
BAW256 British Airways 19 2026-04-16
BAW249 - 19 2026-06-23
BAW248 - 18 2026-06-23
BAW257 British Airways 12 2026-04-16
BAW46EZ - 9 2026-06-30
BAW461 - 9 2026-06-30
BAW291 - 9 2026-06-29
BAW290 - 9 2026-06-29
BAW264 - 8 2026-06-26
BAW88C - 7 2026-06-16
BAW5VY - 7 2026-06-15
BAW265 - 7 2026-06-25
BAW2LJ - 6 2026-06-18
BAW22B - 6 2026-06-17
BAW120 - 6 2026-06-29
BAW51B - 5 2026-06-28
BAW21V - 5 2026-06-28
BAW198 British Airways 5 2026-05-17
BAW118 British Airways 5 2026-05-14
BAW50G - 4 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-30 BAW461 MAD → LHR Jun 30, 15:50 UTCJun 30, 17:35 UTC1h 45m
2026-06-30 BAW46EZ - Jun 30, 11:45 UTCJun 30, 13:40 UTC1h 55m
2026-06-29 BAW290 IAD → LHR Jun 29, 23:34 UTCJun 30, 06:10 UTC6h 36m
2026-06-29 BAW291 - Jun 29, 13:24 UTCJun 29, 20:54 UTC7h 30m
2026-06-29 BAW120 - Jun 29, 01:44 UTCJun 29, 08:54 UTC7h 10m
2026-06-28 BAW21V - Jun 28, 15:44 UTCJun 28, 23:25 UTC7h 40m
2026-06-28 BAW51B BOS → LHR Jun 28, 03:05 UTCJun 28, 08:39 UTC5h 35m
2026-06-27 BAW50G - Jun 27, 18:04 UTCJun 28, 00:35 UTC6h 30m
2026-06-26 BAW276 - Jun 26, 16:49 UTCJun 27, 12:45 UTC19h 55m
2026-06-26 BAW276 - Jun 26, 15:05 UTCJun 27, 12:45 UTC21h 40m
2026-06-26 BAW264 - Jun 26, 00:15 UTCJun 26, 10:20 UTC10h 5m
2026-06-25 BAW265 - Jun 25, 10:59 UTCJun 25, 21:35 UTC10h 35m
2026-06-24 BAW290 IAD → LHR Jun 24, 23:40 UTCJun 25, 06:09 UTC6h 30m
2026-06-24 BAW291 - Jun 24, 13:44 UTCJun 24, 21:19 UTC7h 35m
2026-06-23 BAW248 - Jun 23, 20:10 UTCJun 24, 06:50 UTC10h 40m
2026-06-23 BAW248 EZE → GIG Jun 23, 15:44 UTCJun 23, 18:20 UTC2h 35m
2026-06-23 BAW249 - Jun 23, 10:35 UTCJun 23, 13:24 UTC2h 50m
2026-06-22 BAW249 - Jun 22, 21:19 UTCJun 23, 08:15 UTC10h 55m
2026-06-22 BAW461 MAD → LHR Jun 22, 15:50 UTCJun 22, 17:44 UTC1h 55m
2026-06-22 BAW46EZ - Jun 22, 11:39 UTCJun 22, 13:35 UTC1h 55m
2026-06-22 BAW51B BOS → LHR Jun 22, 02:25 UTCJun 22, 08:25 UTC6h 0m
2026-06-21 BAW50G - Jun 21, 17:15 UTCJun 21, 23:55 UTC6h 40m
2026-06-21 BAW264 - Jun 21, 00:10 UTCJun 21, 10:04 UTC9h 55m
2026-06-20 BAW265 - Jun 20, 11:09 UTCJun 20, 20:45 UTC9h 35m
2026-06-20 BAW64 - Jun 20, 02:49 UTCJun 20, 04:44 UTC1h 55m
2026-06-19 BAW65 - Jun 19, 09:09 UTCJun 19, 12:25 UTC3h 15m
2026-06-18 BAW5CA YYZ → LHR Jun 18, 22:45 UTCJun 19, 05:19 UTC6h 34m
2026-06-18 BAW9ZY - Jun 18, 13:15 UTCJun 18, 20:15 UTC7h 0m
2026-06-18 BAW2LJ - Jun 18, 01:45 UTCJun 18, 08:15 UTC6h 30m
2026-06-17 BAW22B - Jun 17, 16:05 UTCJun 17, 23:30 UTC7h 25m
2026-06-16 BAW88C - Jun 16, 04:15 UTCJun 16, 13:09 UTC8h 55m
2026-06-15 BAW5VY - Jun 15, 16:59 UTCJun 16, 01:45 UTC8h 45m
2026-06-15 BAW88C - Jun 15, 04:34 UTCJun 15, 13:20 UTC8h 45m
2026-06-14 BAW5VY - Jun 14, 17:20 UTCJun 15, 02:24 UTC9h 4m
2026-06-14 BAW2LJ - Jun 14, 01:55 UTCJun 14, 08:30 UTC6h 35m
2026-06-13 BAW22B LHR → BWI Jun 13, 21:15 UTCJun 13, 23:25 UTC2h 10m
2026-06-13 BAW22B LHR → BWI Jun 13, 15:55 UTCJun 13, 17:20 UTC1h 25m
2026-06-13 BAW120 - Jun 13, 01:45 UTCJun 13, 08:55 UTC7h 9m
2026-06-12 BAW21V LHR → CVG Jun 12, 15:15 UTCJun 12, 23:25 UTC8h 10m
2026-06-12 BAW264 IAD → LHR Jun 12, 00:10 UTCJun 12, 10:05 UTC9h 56m
2026-06-11 BAW265 LHR → SAN Jun 11, 11:10 UTCJun 11, 21:55 UTC10h 45m
2026-06-11 BAW290 LHR → IAD Jun 11, 03:00 UTCJun 11, 08:05 UTC5h 5m
2026-06-11 BAW290 LHR → IAD Jun 11, 01:05 UTCJun 11, 02:55 UTC1h 50m
2026-06-10 BAW291 LHR → SFO Jun 10, 13:35 UTCJun 10, 21:30 UTC7h 55m
2026-06-09 BAW248 GIG → LHR Jun 9, 20:10 UTCJun 10, 07:00 UTC10h 50m
2026-06-09 BAW248 GIG → LHR Jun 9, 17:00 UTCJun 9, 17:40 UTC40m
2026-06-09 BAW249 LHR → GIG Jun 9, 10:30 UTCJun 9, 13:35 UTC3h 5m
2026-06-08 BAW249 LHR → GIG Jun 8, 21:05 UTCJun 9, 08:30 UTC11h 25m
2026-06-08 BAW461 MAD → LHR Jun 8, 15:45 UTCJun 8, 17:35 UTC1h 50m
2026-06-08 BAW46EZ LHR → MAD Jun 8, 12:00 UTCJun 8, 13:45 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-YMMR page for operator, model, and routing details .

Mode-S 405BFB frequently asked

What is Mode-S code 405BFB?
405BFB is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-YMMR.
Where is Mode-S 405BFB registered?
Mode-S code 405BFB 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 405BFB broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 405BFB, octal 20055773, decimal 4,217,851.
What flights does 405BFB operate?
Mode-S 405BFB has broadcast 20 distinct callsigns, including BAW256, BAW249, BAW248, BAW257, BAW46EZ.