Apparatus

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sensors Mode-S transponder

40621D

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-STBC · BOEING 777-300ER

Hex
40621D
Octal
20061035
Decimal
4,219,421
Country
GB
Tail
G-STBC
Type
B77W
No current signal · last broadcast 48m ago
Flights observed
114
Distinct callsigns
20
Country
GB
Last broadcast
48m ago

Last known position

Most recent position reported by Mode-S 40621D.

Country allocation

The ICAO 24-bit address 40621D 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
BAW21B British Airways 13 2026-05-14
BAW28F British Airways 11 2026-05-15
BAW12 British Airways 11 2026-05-05
BAW6B British Airways 8 2026-05-22
BAW11 British Airways 8 2026-05-04
BAW28K British Airways 5 2026-05-29
BAW15K British Airways 5 2026-04-18
BAW116 British Airways 5 2026-04-19
BAW9SW British Airways 3 2026-05-16
BAW8DS British Airways 3 2026-05-09
BAW82P British Airways 3 2026-05-15
BAW283 British Airways 3 2026-05-09
BAW198 British Airways 3 2026-05-19
BAW14K British Airways 3 2026-05-24
BAW04A British Airways 3 2026-04-25
BAW40F British Airways 2 2026-04-20
BAW29C British Airways 2 2026-05-11
BAW293 British Airways 2 2026-05-10
BAW180 British Airways 2 2026-04-25
BAW173A British Airways 2 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BAW28K LHR → SFO May 29, 14:15 UTCMay 30, 00:50 UTC10h 35m
2026-05-28 BAW142 DEL → LHR May 28, 20:35 UTCMay 29, 05:40 UTC9h 5m
2026-05-28 BAW143 LHR → DEL May 28, 10:35 UTCMay 28, 18:15 UTC7h 40m
2026-05-28 BAW290 LHR → IAD May 28, 00:30 UTCMay 28, 07:25 UTC6h 55m
2026-05-27 BAW291 LHR → SFO May 27, 13:50 UTCMay 27, 21:45 UTC7h 55m
2026-05-26 BAW196E IAH → LHR May 26, 02:39 UTCMay 26, 11:15 UTC8h 35m
2026-05-25 BAW97A LHR → IAH May 25, 14:20 UTCMay 26, 00:09 UTC9h 50m
2026-05-24 BAW14K JFK → LHR May 24, 02:40 UTCMay 24, 08:50 UTC6h 10m
2026-05-23 BAW33K LHR → JFK May 23, 16:20 UTCMay 23, 23:30 UTC7h 11m
2026-05-23 BAW48Q SEA → LHR May 23, 04:05 UTCMay 23, 12:50 UTC8h 45m
2026-05-22 BAW49 LHR → SEA May 22, 16:05 UTCMay 23, 01:10 UTC9h 5m
2026-05-22 BAW6B SFO → LHR May 22, 02:50 UTCMay 22, 12:20 UTC9h 30m
2026-05-21 BAW28K LHR → SFO May 21, 14:05 UTCMay 22, 00:05 UTC10h 0m
2026-05-21 BAW14K JFK → LHR May 21, 09:45 UTCMay 21, 11:20 UTC1h 35m
2026-05-21 BAW14K JFK → LHR May 21, 05:10 UTCMay 21, 06:30 UTC1h 20m
2026-05-20 BAW183 LHR → JFK May 20, 18:55 UTCMay 21, 02:20 UTC7h 25m
2026-05-19 BAW198 BOM → LHR May 19, 07:45 UTCMay 19, 17:10 UTC9h 25m
2026-05-18 BAW199 LHR → BOM May 18, 20:30 UTCMay 19, 05:30 UTC9h 0m
2026-05-17 BAW198 BOM → LHR May 17, 21:20 UTCMay 18, 17:25 UTC20h 5m
2026-05-17 BAW198 BOM → LHR May 17, 20:35 UTCMay 18, 17:25 UTC20h 50m
2026-05-17 BAW29G BOS → LHR May 17, 11:40 UTCMay 17, 17:30 UTC5h 50m
2026-05-16 BAW239 LHR → BOS May 16, 20:05 UTCMay 17, 02:55 UTC6h 50m
2026-05-16 BAW9SW SAN → LHR May 16, 03:10 UTCMay 16, 12:55 UTC9h 46m
2026-05-15 BAW82P LHR → SAN May 15, 14:20 UTCMay 16, 00:55 UTC10h 34m
2026-05-15 BAW28F LAX → LHR May 15, 00:25 UTCMay 15, 10:05 UTC9h 40m
2026-05-14 BAW21B LHR → LAX May 14, 11:05 UTCMay 14, 21:40 UTC10h 35m
2026-05-13 BAW461 MAD → LHR May 13, 17:10 UTCMay 13, 18:55 UTC1h 45m
2026-05-13 BAW46EZ LHR → MAD May 13, 13:31 UTCMay 13, 15:10 UTC1h 40m
2026-05-12 BAW9SW SAN → LHR May 12, 03:15 UTCMay 12, 13:05 UTC9h 50m
2026-05-11 BAW82P LHR → SAN May 11, 14:00 UTCMay 11, 22:15 UTC8h 15m
2026-05-11 BAW29C IAD → LHR May 11, 03:00 UTCMay 11, 09:40 UTC6h 40m
2026-05-10 BAW293 LHR → IAD May 10, 16:40 UTCMay 11, 00:15 UTC7h 35m
2026-05-09 BAW8DS LAX → LHR May 9, 23:09 UTCMay 10, 09:05 UTC9h 55m
2026-05-09 BAW283 LHR → LAX May 9, 09:55 UTCMay 9, 20:25 UTC10h 30m
2026-05-08 BAW6B SFO → LHR May 8, 02:49 UTCMay 8, 12:55 UTC10h 5m
2026-05-07 BAW28K LHR → SFO May 7, 14:00 UTCMay 8, 00:09 UTC10h 9m
2026-05-06 BAW8DS LAX → LHR May 6, 23:05 UTCMay 7, 08:55 UTC9h 50m
2026-05-06 BAW283 LHR → LAX May 6, 09:50 UTCMay 6, 19:50 UTC9h 59m
2026-05-05 BAW12 SIN → LHR May 5, 15:50 UTCMay 6, 05:15 UTC13h 25m
2026-05-04 BAW11 LHR → SIN May 4, 19:15 UTCMay 5, 07:30 UTC12h 15m
2026-05-04 BAW6B SFO → LHR May 4, 03:40 UTCMay 4, 13:30 UTC9h 50m
2026-05-03 BAW28K LHR → SFO May 3, 15:10 UTCMay 4, 01:24 UTC10h 15m
2026-05-03 BAW28F LAX → LHR May 3, 00:20 UTCMay 3, 10:15 UTC9h 54m
2026-05-02 BAW21B LHR → LAX May 2, 11:20 UTCMay 2, 22:00 UTC10h 40m
2026-05-01 BAW5CA YYZ → LHR May 1, 23:10 UTCMay 2, 05:45 UTC6h 35m
2026-05-01 BAW9ZY LHR → YYZ May 1, 13:25 UTCMay 1, 20:10 UTC6h 45m
2026-05-01 BAW29C IAD → LHR May 1, 02:45 UTCMay 1, 09:50 UTC7h 5m
2026-04-30 BAW293 LHR → IAD Apr 30, 16:40 UTCApr 30, 23:50 UTC7h 10m
2026-04-30 BAW9SW SAN → LHR Apr 30, 03:20 UTCApr 30, 13:10 UTC9h 50m
2026-04-29 BAW82P LHR → SAN Apr 29, 14:10 UTCApr 30, 00:45 UTC10h 34m

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

Mode-S 40621D frequently asked

What is Mode-S code 40621D?
40621D is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-STBC.
Where is Mode-S 40621D registered?
Mode-S code 40621D 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 40621D broadcasting right now?
No active broadcast right now. Last signal was 48m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40621D, octal 20061035, decimal 4,219,421.
What flights does 40621D operate?
Mode-S 40621D has broadcast 20 distinct callsigns, including BAW21B, BAW28F, BAW12, BAW6B, BAW11.