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sensors Mode-S transponder

402127

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-BMSB · SUPERMARINE Spitfire

Hex
402127
Octal
20020447
Decimal
4,202,791
Country
GB
Tail
G-BMSB
Type
SPIT
No current signal · last broadcast 7d ago
Flights observed
137
Distinct callsigns
1
Country
GB
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S 402127.

Country allocation

The ICAO 24-bit address 402127 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 1 distinct

Callsign Airline Flights Last seen
GBMSB - 137 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 GBMSB - Jul 10, 10:30 UTCJul 10, 11:00 UTC30m
2026-07-10 GBMSB - Jul 10, 09:35 UTCJul 10, 09:50 UTC15m
2026-07-08 GBMSB - Jul 8, 14:25 UTCJul 8, 14:40 UTC15m
2026-07-08 GBMSB - Jul 8, 13:05 UTCJul 8, 13:35 UTC30m
2026-07-06 GBMSB - Jul 6, 12:15 UTCJul 6, 13:10 UTC55m
2026-07-05 GBMSB - Jul 5, 16:25 UTCJul 5, 17:35 UTC1h 10m
2026-07-05 GBMSB - Jul 5, 15:20 UTCJul 5, 15:40 UTC20m
2026-07-05 GBMSB - Jul 5, 14:25 UTCJul 5, 14:45 UTC20m
2026-07-04 GBMSB BLK → BLK Jul 4, 16:15 UTCJul 4, 16:55 UTC40m
2026-07-04 GBMSB - Jul 4, 14:30 UTCJul 4, 14:45 UTC15m
2026-07-04 GBMSB - Jul 4, 13:15 UTCJul 4, 13:35 UTC20m
2026-07-04 GBMSB - Jul 4, 12:00 UTCJul 4, 12:20 UTC20m
2026-07-04 GBMSB - Jul 4, 10:50 UTCJul 4, 11:05 UTC15m
2026-07-03 GBMSB - Jul 3, 16:55 UTCJul 3, 17:40 UTC45m
2026-07-03 GBMSB - Jul 3, 14:40 UTCJul 3, 15:55 UTC1h 15m
2026-07-03 GBMSB - Jul 3, 13:40 UTCJul 3, 14:05 UTC25m
2026-07-03 GBMSB - Jul 3, 12:20 UTCJul 3, 12:40 UTC20m
2026-07-03 GBMSB - Jul 3, 11:05 UTCJul 3, 11:25 UTC20m
2026-07-03 GBMSB - Jul 3, 09:50 UTCJul 3, 10:20 UTC30m
2026-07-02 GBMSB - Jul 2, 19:10 UTCJul 2, 19:40 UTC30m
2026-07-02 GBMSB - Jul 2, 15:20 UTCJul 2, 15:30 UTC10m
2026-07-02 GBMSB - Jul 2, 10:50 UTCJul 2, 11:25 UTC35m
2026-07-01 GBMSB - Jul 1, 12:35 UTCJul 1, 13:10 UTC35m
2026-06-29 GBMSB - Jun 29, 13:39 UTCJun 29, 13:49 UTC10m
2026-06-28 GBMSB - Jun 28, 14:30 UTCJun 28, 14:50 UTC20m
2026-06-28 GBMSB - Jun 28, 13:40 UTCJun 28, 13:49 UTC10m
2026-06-28 GBMSB - Jun 28, 12:44 UTCJun 28, 13:00 UTC15m
2026-06-28 GBMSB - Jun 28, 11:25 UTCJun 28, 11:59 UTC35m
2026-06-28 GBMSB - Jun 28, 10:10 UTCJun 28, 10:39 UTC30m
2026-06-28 GBMSB - Jun 28, 09:05 UTCJun 28, 09:15 UTC10m
2026-06-06 GBMSB BLK → BLK Jun 6, 17:29 UTCJun 6, 17:54 UTC25m
2026-06-06 GBMSB BLK → BLK Jun 6, 15:15 UTCJun 6, 15:39 UTC25m
2026-06-06 GBMSB - Jun 6, 14:20 UTCJun 6, 14:40 UTC20m
2026-06-06 GBMSB BLK → BLK Jun 6, 13:20 UTCJun 6, 13:39 UTC20m
2026-06-06 GBMSB - Jun 6, 12:24 UTCJun 6, 12:45 UTC20m
2026-06-06 GBMSB BLK → BLK Jun 6, 10:50 UTCJun 6, 11:30 UTC40m
2026-06-06 GBMSB BLK → BLK Jun 6, 09:19 UTCJun 6, 09:39 UTC20m
2026-06-06 GBMSB BLK → BLK Jun 6, 08:20 UTCJun 6, 08:45 UTC25m
2026-06-05 GBMSB - Jun 5, 15:50 UTCJun 5, 16:50 UTC1h 0m
2026-06-05 GBMSB - Jun 5, 14:35 UTCJun 5, 14:55 UTC20m
2026-06-05 GBMSB - Jun 5, 12:45 UTCJun 5, 12:55 UTC10m
2026-06-04 GBMSB - Jun 4, 10:50 UTCJun 4, 11:25 UTC35m
2026-06-04 GBMSB - Jun 4, 09:10 UTCJun 4, 09:35 UTC25m
2026-05-31 GBMSB - May 31, 13:40 UTCMay 31, 13:50 UTC10m
2026-05-30 GBMSB - May 30, 17:25 UTCMay 30, 18:00 UTC35m
2026-05-30 GBMSB - May 30, 14:40 UTCMay 30, 14:55 UTC15m
2026-05-30 GBMSB - May 30, 11:50 UTCMay 30, 12:05 UTC15m
2026-05-30 GBMSB - May 30, 08:40 UTCMay 30, 09:25 UTC45m
2026-05-29 GBMSB - May 29, 16:00 UTCMay 29, 16:10 UTC10m
2026-05-26 GBMSB - May 26, 14:30 UTCMay 26, 14:45 UTC15m

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

Mode-S 402127 frequently asked

What is Mode-S code 402127?
402127 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-BMSB.
Where is Mode-S 402127 registered?
Mode-S code 402127 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 402127 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 402127, octal 20020447, decimal 4,202,791.
What flights does 402127 operate?
Mode-S 402127 has broadcast 1 distinct callsign, including GBMSB.