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sensors Mode-S transponder

40621C

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
40621C
Octal
20061034
Decimal
4,219,420
Country
GB
Tail
G-STBB
Type
B77W
Broadcasting now · callsign BAW239 · 34,000 ft
Flights observed
147
Distinct callsigns
20
Country
GB
Last broadcast
33m ago

Current position

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

Country allocation

The ICAO 24-bit address 40621C 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
BAW180 - 10 2026-06-26
BAW173A British Airways 9 2026-07-06
BAW04A - 9 2026-06-26
BAW40F - 8 2026-07-06
BAW29C - 7 2026-07-01
BAW49 British Airways 6 2026-06-10
BAW48Q British Airways 6 2026-06-11
BAW293 - 6 2026-06-30
BAW196E - 6 2026-07-04
BAW12 - 6 2026-07-13
BAW11 - 6 2026-07-12
BAW97A - 5 2026-07-03
BAW8DS - 5 2026-07-07
BAW33K British Airways 5 2026-07-02
BAW28K - 5 2026-07-09
BAW28F - 5 2026-06-24
BAW283 British Airways 5 2026-07-07
BAW21B - 5 2026-06-23
BAW14K - 5 2026-07-03
BAW6B - 4 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 BAW239 - Jul 14, 20:40 UTCJul 14, 21:00 UTC20m
2026-07-13 BAW12 - Jul 13, 15:50 UTCJul 14, 04:45 UTC12h 55m
2026-07-12 BAW11 - Jul 12, 20:30 UTCJul 13, 08:55 UTC12h 25m
2026-07-11 BAW12 - Jul 11, 15:35 UTCJul 12, 05:05 UTC13h 30m
2026-07-10 BAW11 - Jul 10, 19:05 UTCJul 11, 07:35 UTC12h 30m
2026-07-10 BAW6B - Jul 10, 03:15 UTCJul 10, 12:45 UTC9h 30m
2026-07-09 BAW28K LHR → SFO Jul 9, 14:30 UTCJul 10, 00:55 UTC10h 25m
2026-07-09 BAW86 YVR → LHR Jul 9, 01:15 UTCJul 9, 10:15 UTC9h 0m
2026-07-08 BAW87 - Jul 8, 12:05 UTCJul 8, 21:10 UTC9h 5m
2026-07-07 BAW8DS LAX → LHR Jul 7, 23:15 UTCJul 8, 09:05 UTC9h 50m
2026-07-07 BAW283 LHR → LAX Jul 7, 10:00 UTCJul 7, 20:40 UTC10h 40m
2026-07-06 BAW40F JFK → LHR Jul 6, 23:40 UTCJul 7, 05:45 UTC6h 5m
2026-07-06 BAW173A LHR → JFK Jul 6, 11:40 UTCJul 6, 19:10 UTC7h 30m
2026-07-05 BAW11J JFK → LHR Jul 5, 23:40 UTCJul 6, 05:35 UTC5h 55m
2026-07-05 BAW181 LHR → EWR Jul 5, 12:00 UTCJul 5, 19:10 UTC7h 10m
2026-07-05 BAW116 JFK → LHR Jul 5, 00:40 UTCJul 5, 06:50 UTC6h 10m
2026-07-04 BAW15K LHR → JFK Jul 4, 15:00 UTCJul 4, 22:00 UTC7h 0m
2026-07-04 BAW196E - Jul 4, 02:45 UTCJul 4, 11:20 UTC8h 35m
2026-07-03 BAW97A - Jul 3, 14:20 UTCJul 4, 00:10 UTC9h 50m
2026-07-03 BAW14K JFK → LHR Jul 3, 02:50 UTCJul 3, 09:05 UTC6h 15m
2026-07-02 BAW33K LHR → JFK Jul 2, 16:05 UTCJul 2, 23:20 UTC7h 15m
2026-07-02 BAW196E - Jul 2, 02:40 UTCJul 2, 11:05 UTC8h 25m
2026-07-01 BAW97A - Jul 1, 14:20 UTCJul 2, 00:20 UTC10h 0m
2026-07-01 BAW29C IAD → LHR Jul 1, 03:30 UTCJul 1, 09:55 UTC6h 25m
2026-06-30 BAW293 - Jun 30, 17:45 UTCJul 1, 01:05 UTC7h 20m
2026-06-30 BAW9SW - Jun 30, 04:55 UTCJun 30, 14:10 UTC9h 15m
2026-06-29 BAW82P LHR → SAN Jun 29, 16:15 UTCJun 30, 02:45 UTC10h 31m
2026-06-28 BAW40F - Jun 28, 23:09 UTCJun 29, 05:09 UTC6h 0m
2026-06-28 BAW173A LHR → JFK Jun 28, 11:04 UTCJun 28, 18:05 UTC7h 0m
2026-06-27 BAW40F JFK → LHR Jun 27, 23:00 UTCJun 28, 05:15 UTC6h 15m
2026-06-27 BAW173A LHR → JFK Jun 27, 11:30 UTCJun 27, 18:29 UTC7h 0m
2026-06-26 BAW180 JFK → LHR Jun 26, 23:44 UTCJun 27, 05:49 UTC6h 5m
2026-06-26 BAW04A - Jun 26, 12:50 UTCJun 26, 20:00 UTC7h 10m
2026-06-26 BAW116 - Jun 26, 01:29 UTCJun 26, 07:35 UTC6h 5m
2026-06-25 BAW15K LHR → JFK Jun 25, 15:15 UTCJun 25, 22:20 UTC7h 5m
2026-06-25 BAW196E - Jun 25, 02:54 UTCJun 25, 11:19 UTC8h 25m
2026-06-24 BAW97A - Jun 24, 14:55 UTCJun 25, 00:40 UTC9h 45m
2026-06-24 BAW28F - Jun 24, 00:20 UTCJun 24, 09:55 UTC9h 35m
2026-06-23 BAW21B - Jun 23, 11:29 UTCJun 23, 21:59 UTC10h 30m
2026-06-22 BAW40F JFK → LHR Jun 22, 22:54 UTCJun 23, 05:20 UTC6h 25m
2026-06-22 BAW173A LHR → JFK Jun 22, 11:04 UTCJun 22, 18:04 UTC7h 0m
2026-06-21 BAW180 - Jun 21, 23:44 UTCJun 22, 06:15 UTC6h 30m
2026-06-21 BAW04A - Jun 21, 13:00 UTCJun 21, 19:55 UTC6h 55m
2026-06-20 BAW40F JFK → LHR Jun 20, 23:19 UTCJun 21, 05:44 UTC6h 25m
2026-06-20 BAW173A LHR → JFK Jun 20, 10:55 UTCJun 20, 17:59 UTC7h 5m
2026-06-19 BAW180 JFK → LHR Jun 19, 23:59 UTCJun 20, 05:54 UTC5h 55m
2026-06-19 BAW04A - Jun 19, 12:49 UTCJun 19, 20:09 UTC7h 20m
2026-06-19 BAW116 JFK → LHR Jun 19, 01:15 UTCJun 19, 07:34 UTC6h 20m
2026-06-18 BAW15K LHR → JFK Jun 18, 15:30 UTCJun 18, 22:25 UTC6h 55m
2026-06-18 BAW180 JFK → LHR Jun 18, 00:40 UTCJun 18, 06:50 UTC6h 10m

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

Mode-S 40621C frequently asked

What is Mode-S code 40621C?
40621C is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-STBB.
Where is Mode-S 40621C registered?
Mode-S code 40621C 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 40621C broadcasting right now?
Yes. Mode-S 40621C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40621C, octal 20061034, decimal 4,219,420.
What flights does 40621C operate?
Mode-S 40621C has broadcast 20 distinct callsigns, including BAW180, BAW173A, BAW04A, BAW40F, BAW29C.