Apparatus

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sensors Mode-S transponder

402D2D

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-LEOS · ROBIN DR-400

Hex
402D2D
Octal
20026455
Decimal
4,205,869
Country
GB
Tail
G-LEOS
Type
DR40
No current signal · last broadcast 7h ago
Flights observed
83
Distinct callsigns
1
Country
GB
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 402D2D.

Country allocation

The ICAO 24-bit address 402D2D 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
GLEOS - 82 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 GLEOS - Jul 18, 11:15 UTCJul 18, 12:20 UTC1h 5m
2026-07-18 GLEOS - Jul 18, 08:55 UTCJul 18, 09:30 UTC35m
2026-07-16 GLEOS - Jul 16, 11:20 UTCJul 16, 12:00 UTC40m
2026-07-15 GLEOS EXT → EXT Jul 15, 17:35 UTCJul 15, 18:25 UTC50m
2026-07-15 GLEOS - Jul 15, 15:15 UTCJul 15, 16:10 UTC55m
2026-07-15 GLEOS - Jul 15, 09:00 UTCJul 15, 09:35 UTC35m
2026-07-13 GLEOS - Jul 13, 11:40 UTCJul 13, 12:30 UTC50m
2026-07-10 GLEOS - Jul 10, 09:25 UTCJul 10, 10:30 UTC1h 5m
2026-07-08 GLEOS EXT → EXT Jul 8, 11:05 UTCJul 8, 11:30 UTC25m
2026-07-08 GLEOS - Jul 8, 08:45 UTCJul 8, 09:25 UTC40m
2026-07-06 GLEOS EXT → EXT Jul 6, 15:25 UTCJul 6, 16:10 UTC45m
2026-07-06 GLEOS - Jul 6, 13:20 UTCJul 6, 14:05 UTC45m
2026-07-06 GLEOS - Jul 6, 11:10 UTCJul 6, 11:50 UTC40m
2026-07-06 GLEOS EXT → EXT Jul 6, 08:35 UTCJul 6, 09:35 UTC1h 0m
2026-07-05 GLEOS - Jul 5, 17:00 UTCJul 5, 17:35 UTC35m
2026-07-05 GLEOS - Jul 5, 13:15 UTCJul 5, 14:10 UTC55m
2026-07-05 GLEOS - Jul 5, 11:15 UTCJul 5, 11:45 UTC30m
2026-07-03 GLEOS EXT → EXT Jul 3, 17:45 UTCJul 3, 18:35 UTC50m
2026-07-03 GLEOS - Jul 3, 14:55 UTCJul 3, 15:40 UTC45m
2026-07-03 GLEOS - Jul 3, 12:30 UTCJul 3, 13:05 UTC35m
2026-07-03 GLEOS EXT → EXT Jul 3, 07:45 UTCJul 3, 08:20 UTC35m
2026-07-02 GLEOS - Jul 2, 11:15 UTCJul 2, 12:05 UTC50m
2026-07-01 GLEOS EXT → EXT Jul 1, 17:25 UTCJul 1, 18:20 UTC55m
2026-06-30 GLEOS - Jun 30, 07:55 UTCJun 30, 08:30 UTC35m
2026-06-28 GLEOS - Jun 28, 17:19 UTCJun 28, 17:55 UTC35m
2026-06-28 GLEOS - Jun 28, 14:34 UTCJun 28, 15:29 UTC55m
2026-06-28 GLEOS - Jun 28, 11:25 UTCJun 28, 12:09 UTC45m
2026-06-28 GLEOS - Jun 28, 08:59 UTCJun 28, 09:34 UTC35m
2026-06-27 GLEOS - Jun 27, 16:55 UTCJun 27, 17:39 UTC45m
2026-06-27 GLEOS EXT → EXT Jun 27, 14:54 UTCJun 27, 15:55 UTC1h 0m
2026-06-27 GLEOS EXT → EXT Jun 27, 11:04 UTCJun 27, 11:50 UTC45m
2026-06-26 GLEOS - Jun 26, 17:35 UTCJun 26, 18:15 UTC40m
2026-06-24 GLEOS - Jun 24, 11:54 UTCJun 24, 12:50 UTC55m
2026-06-22 GLEOS - Jun 22, 09:19 UTCJun 22, 10:19 UTC1h 0m
2026-06-21 GLEOS - Jun 21, 17:05 UTCJun 21, 17:39 UTC35m
2026-06-21 GLEOS - Jun 21, 13:59 UTCJun 21, 14:44 UTC45m
2026-06-21 GLEOS - Jun 21, 11:34 UTCJun 21, 12:10 UTC35m
2026-06-21 GLEOS EXT → EXT Jun 21, 08:10 UTCJun 21, 08:54 UTC45m
2026-06-19 GLEOS - Jun 19, 14:04 UTCJun 19, 14:39 UTC35m
2026-06-15 GLEOS - Jun 15, 17:20 UTCJun 15, 17:54 UTC35m
2026-06-15 GLEOS - Jun 15, 14:30 UTCJun 15, 15:04 UTC35m
2026-06-15 GLEOS - Jun 15, 11:24 UTCJun 15, 12:15 UTC50m
2026-06-15 GLEOS - Jun 15, 09:00 UTCJun 15, 09:45 UTC45m
2026-06-14 GLEOS - Jun 14, 13:50 UTCJun 14, 14:35 UTC45m
2026-06-14 GLEOS - Jun 14, 10:30 UTCJun 14, 11:10 UTC40m
2026-06-14 GLEOS - Jun 14, 08:05 UTCJun 14, 08:50 UTC45m
2026-06-13 GLEOS - Jun 13, 13:35 UTCJun 13, 14:15 UTC40m
2026-06-13 GLEOS - Jun 13, 10:55 UTCJun 13, 12:15 UTC1h 20m
2026-06-13 GLEOS - Jun 13, 08:50 UTCJun 13, 09:55 UTC1h 5m
2026-06-08 GLEOS - Jun 8, 17:40 UTCJun 8, 18:20 UTC40m

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

Mode-S 402D2D frequently asked

What is Mode-S code 402D2D?
402D2D is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-LEOS.
Where is Mode-S 402D2D registered?
Mode-S code 402D2D 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 402D2D broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 402D2D, octal 20026455, decimal 4,205,869.
What flights does 402D2D operate?
Mode-S 402D2D has broadcast 1 distinct callsign, including GLEOS.