Apparatus

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sensors Mode-S transponder

40621B

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
40621B
Octal
20061033
Decimal
4,219,419
Country
GB
Tail
G-STBA
Type
B77W
Broadcasting now · callsign BAW283 · 6,550 ft
Flights observed
90
Distinct callsigns
20
Country
GB
Last broadcast
4h ago

Current position

40621B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40621B 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
BAW299 British Airways 6 2026-04-14
BAW298 British Airways 6 2026-04-15
BAW116 British Airways 5 2026-05-10
BAW49 British Airways 4 2026-05-01
BAW48Q British Airways 4 2026-05-02
BAW40F British Airways 4 2026-04-18
BAW28F British Airways 4 2026-05-09
BAW21B British Airways 4 2026-05-08
BAW180 British Airways 4 2026-05-25
BAW12 British Airways 4 2026-05-29
BAW11 British Airways 4 2026-05-28
BAW9SW British Airways 3 2026-05-22
BAW8DS British Airways 3 2026-05-19
BAW82P British Airways 3 2026-05-21
BAW283 British Airways 3 2026-05-18
BAW173A British Airways 3 2026-04-18
BAW15K British Airways 3 2026-05-09
BAW04A British Airways 3 2026-05-25
BAW6B British Airways 2 2026-05-16
BAW29C British Airways 2 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BAW12 SIN → LHR May 29, 16:05 UTCMay 30, 05:40 UTC13h 35m
2026-05-28 BAW11 LHR → SIN May 28, 19:35 UTCMay 29, 07:55 UTC12h 20m
2026-05-27 BAW142 DEL → LHR May 27, 20:30 UTCMay 28, 05:30 UTC9h 0m
2026-05-27 BAW143 LHR → DEL May 27, 10:25 UTCMay 27, 18:10 UTC7h 45m
2026-05-26 BAW142 DEL → LHR May 26, 20:34 UTCMay 27, 05:35 UTC9h 0m
2026-05-26 BAW143 LHR → DEL May 26, 09:45 UTCMay 26, 17:44 UTC8h 0m
2026-05-25 BAW180 EWR → LHR May 25, 23:49 UTCMay 26, 06:04 UTC6h 15m
2026-05-25 BAW04A JFK → LHR May 25, 13:20 UTCMay 25, 20:24 UTC7h 4m
2026-05-24 BAW290 LHR → IAD May 24, 23:25 UTCMay 25, 06:20 UTC6h 55m
2026-05-24 BAW291 LHR → SFO May 24, 13:15 UTCMay 24, 20:45 UTC7h 30m
2026-05-24 BAW6AC ORD → LHR May 24, 02:40 UTCMay 24, 09:40 UTC7h 0m
2026-05-23 BAW7CP LHR → ORD May 23, 15:00 UTCMay 23, 23:10 UTC8h 10m
2026-05-22 BAW9SW SAN → LHR May 22, 02:45 UTCMay 22, 12:40 UTC9h 55m
2026-05-21 BAW82P LHR → SAN May 21, 14:15 UTCMay 22, 00:20 UTC10h 5m
2026-05-21 BAW29C IAD → LHR May 21, 04:45 UTCMay 21, 11:15 UTC6h 30m
2026-05-20 BAW293 LHR → IAD May 20, 16:55 UTCMay 21, 00:55 UTC8h 0m
2026-05-20 BAW9SW SAN → LHR May 20, 03:05 UTCMay 20, 12:20 UTC9h 16m
2026-05-19 BAW82P LHR → SAN May 19, 14:10 UTCMay 20, 00:40 UTC10h 30m
2026-05-19 BAW8DS LAX → LHR May 19, 00:20 UTCMay 19, 10:00 UTC9h 40m
2026-05-18 BAW283 LHR → LAX May 18, 11:05 UTCMay 18, 21:50 UTC10h 44m
2026-05-17 BAW12 SIN → LHR May 17, 16:01 UTCMay 18, 05:20 UTC13h 20m
2026-05-16 BAW11 LHR → SIN May 16, 18:55 UTCMay 17, 07:30 UTC12h 35m
2026-05-16 BAW6B SFO → LHR May 16, 03:00 UTCMay 16, 12:31 UTC9h 31m
2026-05-15 BAW28K LHR → SFO May 15, 14:10 UTCMay 16, 00:40 UTC10h 29m
2026-05-15 BAW14K JFK → LHR May 15, 04:55 UTCMay 15, 10:55 UTC6h 0m
2026-05-14 BAW33K LHR → JFK May 14, 19:10 UTCMay 15, 02:30 UTC7h 20m
2026-05-14 BAW8DS LAX → LHR May 14, 00:35 UTCMay 14, 09:50 UTC9h 15m
2026-05-13 BAW283 LHR → LAX May 13, 11:10 UTCMay 13, 22:05 UTC10h 55m
2026-05-12 BAW12 SIN → LHR May 12, 15:50 UTCMay 13, 05:25 UTC13h 35m
2026-05-11 BAW11 LHR → SIN May 11, 19:20 UTCMay 12, 07:50 UTC12h 30m
2026-05-11 BAW180 EWR → LHR May 11, 01:05 UTCMay 11, 06:05 UTC5h 0m
2026-05-10 BAW180 EWR → LHR May 10, 23:44 UTCMay 11, 01:00 UTC1h 15m
2026-05-10 BAW04A JFK → LHR May 10, 12:54 UTCMay 10, 20:00 UTC7h 5m
2026-05-10 BAW116 JFK → LHR May 10, 01:20 UTCMay 10, 07:45 UTC6h 25m
2026-05-09 BAW15K LHR → JFK May 9, 14:50 UTCMay 9, 21:45 UTC6h 55m
2026-05-09 BAW28F LAX → LHR May 9, 00:35 UTCMay 9, 10:25 UTC9h 50m
2026-05-08 BAW21B LHR → LAX May 8, 11:49 UTCMay 8, 22:10 UTC10h 20m
2026-05-06 BAW9SW SAN → LHR May 6, 02:55 UTCMay 6, 12:35 UTC9h 40m
2026-05-05 BAW82P LHR → SAN May 5, 14:00 UTCMay 6, 00:10 UTC10h 10m
2026-05-04 BAW8DS LAX → LHR May 4, 23:20 UTCMay 5, 09:05 UTC9h 45m
2026-05-04 BAW283 LHR → LAX May 4, 10:05 UTCMay 4, 20:55 UTC10h 51m
2026-05-03 BAW12 SIN → LHR May 3, 15:55 UTCMay 4, 05:10 UTC13h 15m
2026-05-02 BAW11 LHR → SIN May 2, 19:20 UTCMay 2, 22:15 UTC2h 55m
2026-05-02 BAW48Q SEA → LHR May 2, 04:10 UTCMay 2, 12:40 UTC8h 30m
2026-05-01 BAW49 LHR → SEA May 1, 16:15 UTCMay 2, 01:55 UTC9h 40m
2026-05-01 BAW48Q SEA → LHR May 1, 03:45 UTCMay 1, 12:25 UTC8h 40m
2026-04-30 BAW49 LHR → SEA Apr 30, 16:15 UTCMay 1, 01:30 UTC9h 15m
2026-04-30 BAW48Q SEA → LHR Apr 30, 03:40 UTCApr 30, 12:40 UTC9h 0m
2026-04-29 BAW49 LHR → SEA Apr 29, 16:25 UTCApr 30, 01:30 UTC9h 4m
2026-04-29 BAW48Q SEA → LHR Apr 29, 03:45 UTCApr 29, 13:10 UTC9h 26m

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

Mode-S 40621B frequently asked

What is Mode-S code 40621B?
40621B is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-STBA.
Where is Mode-S 40621B registered?
Mode-S code 40621B 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 40621B broadcasting right now?
Yes. Mode-S 40621B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40621B, octal 20061033, decimal 4,219,419.
What flights does 40621B operate?
Mode-S 40621B has broadcast 20 distinct callsigns, including BAW299, BAW298, BAW116, BAW49, BAW48Q.