Apparatus

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sensors Mode-S transponder

402E21

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-EGTB · PIPER PA-28-140/150/160/180

Hex
402E21
Octal
20027041
Decimal
4,206,113
Country
GB
Tail
G-EGTB
Type
P28A
No current signal · last broadcast Jul 23, 15:15 UTC
Flights observed
59
Distinct callsigns
2
Country
GB
Last broadcast
Jul 23, 15:15 UTC

Last known position

Most recent position reported by Mode-S 402E21.

Country allocation

The ICAO 24-bit address 402E21 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 2 distinct

Callsign Airline Flights Last seen
GEGTB - 57 2026-07-23
GFIAT - 2 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 GEGTB - Jul 23, 14:10 UTCJul 23, 15:15 UTC1h 5m
2026-07-23 GEGTB MME → MME Jul 23, 12:30 UTCJul 23, 13:05 UTC35m
2026-07-22 GEGTB - Jul 22, 15:15 UTCJul 22, 15:50 UTC35m
2026-07-22 GEGTB MME → MME Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-21 GEGTB - Jul 21, 16:50 UTCJul 21, 17:30 UTC40m
2026-07-21 GEGTB - Jul 21, 12:55 UTCJul 21, 14:50 UTC1h 55m
2026-07-21 GEGTB - Jul 21, 10:10 UTCJul 21, 11:05 UTC55m
2026-07-20 GEGTB - Jul 20, 16:00 UTCJul 20, 16:45 UTC45m
2026-07-20 GEGTB MME → MME Jul 20, 14:00 UTCJul 20, 14:35 UTC35m
2026-07-20 GEGTB - Jul 20, 08:45 UTCJul 20, 10:15 UTC1h 30m
2026-07-19 GEGTB - Jul 19, 10:30 UTCJul 19, 12:05 UTC1h 35m
2026-07-17 GEGTB - Jul 17, 12:30 UTCJul 17, 13:00 UTC30m
2026-07-16 GEGTB MME → MME Jul 16, 16:30 UTCJul 16, 17:05 UTC35m
2026-07-16 GEGTB - Jul 16, 14:45 UTCJul 16, 15:19 UTC35m
2026-07-16 GEGTB - Jul 16, 13:30 UTCJul 16, 14:00 UTC30m
2026-07-16 GEGTB - Jul 16, 11:54 UTCJul 16, 12:44 UTC50m
2026-07-15 GEGTB - Jul 15, 10:20 UTCJul 15, 11:05 UTC45m
2026-07-13 GEGTB - Jul 13, 14:25 UTCJul 13, 15:15 UTC50m
2026-07-13 GEGTB MME → MME Jul 13, 10:55 UTCJul 13, 11:30 UTC35m
2026-07-12 GEGTB MME → MME Jul 12, 13:25 UTCJul 12, 13:50 UTC25m
2026-07-11 GEGTB MME → MME Jul 11, 14:30 UTCJul 11, 15:15 UTC45m
2026-07-11 GEGTB - Jul 11, 09:45 UTCJul 11, 10:30 UTC45m
2026-07-10 GEGTB - Jul 10, 18:40 UTCJul 10, 19:50 UTC1h 10m
2026-07-10 GEGTB MME → CEG Jul 10, 13:45 UTCJul 10, 15:00 UTC1h 15m
2026-07-08 GEGTB - Jul 8, 14:00 UTCJul 8, 14:50 UTC50m
2026-07-07 GEGTB - Jul 7, 18:45 UTCJul 7, 19:25 UTC40m
2026-07-04 GEGTB - Jul 4, 12:20 UTCJul 4, 13:35 UTC1h 15m
2026-06-29 GEGTB MME → MME Jun 29, 14:04 UTCJun 29, 15:04 UTC1h 0m
2026-06-29 GEGTB - Jun 29, 09:50 UTCJun 29, 10:55 UTC1h 5m
2026-06-28 GEGTB MME → MME Jun 28, 16:05 UTCJun 28, 16:49 UTC45m
2026-06-28 GEGTB - Jun 28, 14:09 UTCJun 28, 14:59 UTC50m
2026-06-28 GEGTB - Jun 28, 12:09 UTCJun 28, 13:00 UTC50m
2026-06-28 GEGTB MME → MME Jun 28, 10:15 UTCJun 28, 10:55 UTC40m
2026-06-27 GEGTB - Jun 27, 14:00 UTCJun 27, 14:45 UTC45m
2026-06-27 GEGTB - Jun 27, 11:59 UTCJun 27, 12:19 UTC20m
2026-06-27 GEGTB MME → MME Jun 27, 09:55 UTCJun 27, 10:45 UTC50m
2026-06-27 GEGTB MME → MME Jun 27, 08:05 UTCJun 27, 08:55 UTC50m
2026-06-26 GEGTB MME → MME Jun 26, 13:59 UTCJun 26, 14:39 UTC40m
2026-06-23 GEGTB MME → MME Jun 23, 11:59 UTCJun 23, 12:29 UTC30m
2026-06-23 GEGTB - Jun 23, 09:54 UTCJun 23, 10:55 UTC1h 0m
2026-06-22 GEGTB HUY → MME Jun 22, 13:14 UTCJun 22, 13:54 UTC40m
2026-06-22 GEGTB - Jun 22, 11:19 UTCJun 22, 11:44 UTC25m
2026-06-13 GEGTB - Jun 13, 14:30 UTCJun 13, 14:45 UTC15m
2026-06-12 GEGTB - Jun 12, 17:00 UTCJun 12, 17:10 UTC10m
2026-06-12 GEGTB - Jun 12, 16:00 UTCJun 12, 16:10 UTC10m
2026-05-12 GFIAT OXF → OXF May 12, 10:25 UTCMay 12, 11:50 UTC1h 25m
2026-05-06 GFIAT - May 6, 15:30 UTCMay 6, 16:10 UTC40m
2026-04-25 GEGTB - Apr 25, 10:55 UTCApr 25, 11:55 UTC1h 0m
2026-04-23 GEGTB - Apr 23, 09:30 UTCApr 23, 10:30 UTC1h 0m
2026-04-19 GEGTB - Apr 19, 12:00 UTCApr 19, 12:35 UTC35m

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

Mode-S 402E21 frequently asked

What is Mode-S code 402E21?
402E21 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-EGTB.
Where is Mode-S 402E21 registered?
Mode-S code 402E21 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 402E21 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 15:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 402E21, octal 20027041, decimal 4,206,113.
What flights does 402E21 operate?
Mode-S 402E21 has broadcast 2 distinct callsigns, including GEGTB, GFIAT.