Apparatus

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sensors Mode-S transponder

405BFC

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-YMMS · BOEING 777-200

Hex
405BFC
Octal
20055774
Decimal
4,217,852
Country
GB
Tail
G-YMMS
Type
B772
Broadcasting now · callsign BAW86 · -25 ft
Flights observed
188
Distinct callsigns
20
Country
GB
Last broadcast
59m ago

Current position

405BFC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 405BFC 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
BAW134 - 16 2026-07-03
BAW198 British Airways 10 2026-06-01
BAW138 British Airways 10 2026-04-16
BAW135 - 9 2026-07-02
BAW88C - 8 2026-06-19
BAW65 - 8 2026-06-23
BAW64 - 8 2026-06-24
BAW5VY - 8 2026-06-18
BAW249 - 8 2026-07-04
BAW248 - 8 2026-07-04
BAW143 British Airways 7 2026-05-29
BAW139 British Airways 6 2026-04-15
BAW291 - 5 2026-07-10
BAW290 - 5 2026-07-10
BAW276 - 5 2026-06-28
BAW265 - 5 2026-06-26
BAW264 - 5 2026-06-27
BAW199 British Airways 5 2026-05-31
BAW142 British Airways 5 2026-05-29
BAW87 - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 BAW86 - Jul 14, 01:05 UTCJul 14, 09:00 UTC7h 55m
2026-07-13 BAW87 LHR → YVR Jul 13, 13:40 UTCJul 13, 22:50 UTC9h 10m
2026-07-13 BAW86 - Jul 13, 01:01 UTCJul 13, 09:45 UTC8h 45m
2026-07-12 BAW87 LHR → YVR Jul 12, 13:25 UTCJul 12, 22:40 UTC9h 15m
2026-07-11 BAW216 IAD → LHR Jul 11, 22:25 UTCJul 12, 05:10 UTC6h 45m
2026-07-11 BAW7W LHR → IAD Jul 11, 11:55 UTCJul 11, 19:40 UTC7h 45m
2026-07-10 BAW290 IAD → LHR Jul 10, 23:40 UTCJul 11, 06:25 UTC6h 45m
2026-07-10 BAW291 LHR → IAD Jul 10, 13:35 UTCJul 10, 21:25 UTC7h 51m
2026-07-10 BAW290 IAD → LHR Jul 10, 01:05 UTCJul 10, 08:00 UTC6h 55m
2026-07-09 BAW291 - Jul 9, 13:30 UTCJul 9, 21:40 UTC8h 10m
2026-07-09 BAW2LJ - Jul 9, 02:10 UTCJul 9, 08:55 UTC6h 45m
2026-07-08 BAW22B - Jul 8, 16:05 UTCJul 8, 23:25 UTC7h 20m
2026-07-08 BAW120 - Jul 8, 02:30 UTCJul 8, 10:10 UTC7h 40m
2026-07-07 BAW21V - Jul 7, 13:55 UTCJul 7, 21:35 UTC7h 40m
2026-07-07 BAW86 - Jul 7, 01:05 UTCJul 7, 09:55 UTC8h 50m
2026-07-06 BAW87 - Jul 6, 13:40 UTCJul 6, 22:55 UTC9h 15m
2026-07-06 BAW86 YVR → LHR Jul 6, 01:05 UTCJul 6, 10:00 UTC8h 55m
2026-07-05 BAW87 - Jul 5, 11:50 UTCJul 5, 21:20 UTC9h 30m
2026-07-04 BAW248 - Jul 4, 20:05 UTCJul 5, 06:40 UTC10h 35m
2026-07-04 BAW248 - Jul 4, 15:35 UTCJul 4, 17:50 UTC2h 15m
2026-07-04 BAW249 - Jul 4, 10:35 UTCJul 4, 13:40 UTC3h 5m
2026-07-03 BAW249 - Jul 3, 22:00 UTCJul 4, 08:50 UTC10h 50m
2026-07-03 BAW134 - Jul 3, 04:30 UTCJul 3, 14:05 UTC9h 35m
2026-07-02 BAW135 - Jul 2, 17:10 UTCJul 3, 01:50 UTC8h 40m
2026-07-02 BAW134 - Jul 2, 04:50 UTCJul 2, 14:15 UTC9h 25m
2026-07-01 BAW135 - Jul 1, 17:40 UTCJul 2, 02:30 UTC8h 50m
2026-07-01 BAW134 - Jul 1, 04:35 UTCJul 1, 13:50 UTC9h 15m
2026-06-30 BAW135 - Jun 30, 17:25 UTCJul 1, 02:00 UTC8h 35m
2026-06-30 BAW134 - Jun 30, 04:25 UTCJun 30, 13:45 UTC9h 20m
2026-06-29 BAW135 - Jun 29, 17:14 UTCJun 30, 02:05 UTC8h 51m
2026-06-28 BAW276 - Jun 28, 17:04 UTCJun 29, 12:29 UTC19h 25m
2026-06-28 BAW276 - Jun 28, 15:44 UTCJun 29, 12:29 UTC20h 45m
2026-06-28 BAW2LJ - Jun 28, 02:20 UTCJun 28, 08:39 UTC6h 20m
2026-06-27 BAW22B - Jun 27, 16:44 UTCJun 28, 00:00 UTC7h 15m
2026-06-27 BAW264 - Jun 27, 00:14 UTCJun 27, 10:25 UTC10h 10m
2026-06-26 BAW265 - Jun 26, 11:05 UTCJun 26, 21:45 UTC10h 40m
2026-06-25 BAW290 IAD → LHR Jun 25, 23:44 UTCJun 26, 06:15 UTC6h 30m
2026-06-25 BAW291 - Jun 25, 13:45 UTCJun 25, 21:25 UTC7h 40m
2026-06-24 BAW264 - Jun 24, 23:59 UTCJun 25, 10:04 UTC10h 5m
2026-06-24 BAW265 - Jun 24, 11:05 UTCJun 24, 21:44 UTC10h 40m
2026-06-24 BAW64 - Jun 24, 02:40 UTCJun 24, 05:09 UTC2h 30m
2026-06-23 BAW65 - Jun 23, 09:20 UTCJun 23, 11:19 UTC2h 0m
2026-06-23 BAW64 - Jun 23, 02:49 UTCJun 23, 05:04 UTC2h 15m
2026-06-22 BAW65 - Jun 22, 09:34 UTCJun 22, 13:25 UTC3h 50m
2026-06-20 BAW276 - Jun 20, 17:04 UTCJun 21, 12:35 UTC19h 30m
2026-06-20 BAW276 - Jun 20, 15:04 UTCJun 21, 12:35 UTC21h 30m
2026-06-20 BAW51B BOS → LHR Jun 20, 02:49 UTCJun 20, 08:44 UTC5h 55m
2026-06-19 BAW50G - Jun 19, 16:59 UTCJun 19, 23:49 UTC6h 50m
2026-06-19 BAW88C - Jun 19, 04:19 UTCJun 19, 13:20 UTC9h 0m
2026-06-18 BAW5VY - Jun 18, 17:05 UTCJun 19, 01:59 UTC8h 54m

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

Mode-S 405BFC frequently asked

What is Mode-S code 405BFC?
405BFC is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-YMMS.
Where is Mode-S 405BFC registered?
Mode-S code 405BFC 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 405BFC broadcasting right now?
Yes. Mode-S 405BFC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 405BFC, octal 20055774, decimal 4,217,852.
What flights does 405BFC operate?
Mode-S 405BFC has broadcast 20 distinct callsigns, including BAW134, BAW198, BAW138, BAW135, BAW88C.