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 2h ago
Flights observed
127
Distinct callsigns
20
Country
GB
Last broadcast
2h 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
BAW257 British Airways 12 2026-04-16
BAW249 British Airways 12 2026-05-29
BAW248 British Airways 10 2026-05-28
BAW46EZ British Airways 5 2026-05-29
BAW461 British Airways 5 2026-05-29
BAW198 British Airways 5 2026-05-17
BAW118 British Airways 5 2026-05-14
BAW88C British Airways 4 2026-05-24
BAW5VY British Airways 4 2026-05-23
BAW291 British Airways 4 2026-05-26
BAW290 British Airways 4 2026-05-26
BAW120 British Airways 4 2026-05-13
BAW51B British Airways 3 2026-05-26
BAW2LJ British Airways 3 2026-05-23
BAW264 British Airways 3 2026-05-22
BAW21V British Airways 3 2026-05-12
BAW134 British Airways 3 2026-05-25
BAW119 British Airways 3 2026-05-13
BAW98T British Airways 2 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BAW249 LHR → GIG May 29, 21:25 UTCMay 29, 22:20 UTC55m
2026-05-29 BAW461 MAD → LHR May 29, 15:50 UTCMay 29, 17:30 UTC1h 40m
2026-05-29 BAW46EZ LHR → MAD May 29, 11:45 UTCMay 29, 13:35 UTC1h 50m
2026-05-28 BAW248 GIG → LHR May 28, 20:30 UTCMay 29, 07:15 UTC10h 45m
2026-05-28 BAW248 GIG → LHR May 28, 15:35 UTCMay 28, 18:00 UTC2h 25m
2026-05-28 BAW249 LHR → GIG May 28, 10:35 UTCMay 28, 13:25 UTC2h 50m
2026-05-27 BAW249 LHR → GIG May 27, 21:10 UTCMay 28, 08:20 UTC11h 10m
2026-05-26 BAW290 LHR → IAD May 26, 23:29 UTCMay 27, 06:29 UTC7h 0m
2026-05-26 BAW291 LHR → SFO May 26, 13:34 UTCMay 26, 21:04 UTC7h 30m
2026-05-26 BAW51B BOS → LHR May 26, 02:19 UTCMay 26, 08:34 UTC6h 15m
2026-05-25 BAW50G LHR → BOS May 25, 17:15 UTCMay 26, 00:00 UTC6h 44m
2026-05-25 BAW134 BOM → LHR May 25, 04:20 UTCMay 25, 14:00 UTC9h 40m
2026-05-24 BAW135 LHR → BOM May 24, 17:15 UTCMay 24, 21:50 UTC4h 35m
2026-05-24 BAW88C YVR → LHR May 24, 04:15 UTCMay 24, 12:55 UTC8h 40m
2026-05-23 BAW5VY LHR → YVR May 23, 17:00 UTCMay 24, 02:10 UTC9h 10m
2026-05-23 BAW2LJ BWI → LHR May 23, 01:55 UTCMay 23, 08:25 UTC6h 29m
2026-05-22 BAW22B LHR → BWI May 22, 15:45 UTCMay 22, 23:30 UTC7h 45m
2026-05-22 BAW264 IAD → LHR May 22, 05:15 UTCMay 22, 10:05 UTC4h 50m
2026-05-22 BAW264 IAD → LHR May 22, 00:05 UTCMay 22, 05:10 UTC5h 5m
2026-05-21 BAW265 LHR → SAN May 21, 11:00 UTCMay 21, 21:20 UTC10h 20m
2026-05-20 BAW248 GIG → LHR May 20, 19:55 UTCMay 21, 06:25 UTC10h 30m
2026-05-20 BAW248 GIG → LHR May 20, 15:30 UTCMay 20, 18:00 UTC2h 30m
2026-05-20 BAW249 LHR → GIG May 20, 10:20 UTCMay 20, 13:15 UTC2h 55m
2026-05-19 BAW249 LHR → GIG May 19, 21:10 UTCMay 20, 08:25 UTC11h 16m
2026-05-19 BAW461 MAD → LHR May 19, 15:45 UTCMay 19, 17:40 UTC1h 55m
2026-05-19 BAW46EZ LHR → MAD May 19, 11:45 UTCMay 19, 13:30 UTC1h 45m
2026-05-18 BAW248 GIG → LHR May 18, 20:05 UTCMay 19, 06:30 UTC10h 25m
2026-05-18 BAW248 GIG → LHR May 18, 15:40 UTCMay 18, 17:55 UTC2h 15m
2026-05-18 BAW249 LHR → GIG May 18, 11:05 UTCMay 18, 13:55 UTC2h 50m
2026-05-17 BAW249 LHR → GIG May 17, 21:20 UTCMay 18, 08:10 UTC10h 50m
2026-05-17 BAW198 BOM → LHR May 17, 07:50 UTCMay 17, 17:10 UTC9h 20m
2026-05-16 BAW199 LHR → BOM May 16, 20:35 UTCMay 17, 05:35 UTC9h 0m
2026-05-16 BAW198 BOM → LHR May 16, 08:05 UTCMay 16, 17:20 UTC9h 15m
2026-05-15 BAW199 LHR → BOM May 15, 20:50 UTCMay 16, 06:01 UTC9h 11m
2026-05-15 BAW88C YVR → LHR May 15, 07:10 UTCMay 15, 15:55 UTC8h 44m
2026-05-14 BAW5VY LHR → YVR May 14, 20:00 UTCMay 15, 05:10 UTC9h 10m
2026-05-14 BAW118 BLR → LHR May 14, 03:55 UTCMay 14, 12:55 UTC9h 0m
2026-05-13 BAW119 LHR → BLR May 13, 15:05 UTCMay 14, 00:30 UTC9h 25m
2026-05-13 BAW120 CVG → LHR May 13, 02:20 UTCMay 13, 10:00 UTC7h 40m
2026-05-12 BAW21V LHR → CVG May 12, 14:00 UTCMay 12, 22:05 UTC8h 5m
2026-05-11 BAW51B BOS → LHR May 11, 17:20 UTCMay 12, 08:20 UTC15h 0m
2026-05-11 BAW118 BLR → LHR May 11, 03:00 UTCMay 11, 12:05 UTC9h 5m
2026-05-11 BAW118 BLR → LHR May 11, 01:40 UTCMay 11, 01:50 UTC10m
2026-05-10 BAW119 LHR → BLR May 10, 13:25 UTCMay 10, 22:45 UTC9h 20m
2026-05-10 BAW120 CVG → LHR May 10, 01:39 UTCMay 10, 08:54 UTC7h 15m
2026-05-09 BAW21V LHR → CVG May 9, 15:05 UTCMay 9, 23:15 UTC8h 10m
2026-05-08 BAW290 LHR → IAD May 8, 23:25 UTCMay 9, 06:30 UTC7h 5m
2026-05-08 BAW291 LHR → SFO May 8, 13:20 UTCMay 8, 21:00 UTC7h 40m
2026-05-07 BAW290 LHR → IAD May 7, 23:45 UTCMay 8, 06:09 UTC6h 25m
2026-05-07 BAW291 LHR → SFO May 7, 13:25 UTCMay 7, 21:10 UTC7h 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 2h 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, BAW257, BAW249, BAW248, BAW46EZ.