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sensors Mode-S transponder

405761

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-DERH · Schleicher ASK-21

Hex
405761
Octal
20053541
Decimal
4,216,673
Country
GB
Tail
G-DERH
Type
GLID
No current signal · last broadcast 9h ago
Flights observed
103
Distinct callsigns
1
Country
GB
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 405761.

Country allocation

The ICAO 24-bit address 405761 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
GDERH - 102 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 GDERH - Jul 17, 16:49 UTCJul 17, 17:30 UTC40m
2026-07-17 GDERH - Jul 17, 15:00 UTCJul 17, 16:15 UTC1h 15m
2026-07-17 GDERH - Jul 17, 12:30 UTCJul 17, 13:10 UTC40m
2026-07-16 GDERH - Jul 16, 16:55 UTCJul 16, 17:10 UTC15m
2026-07-16 GDERH - Jul 16, 15:25 UTCJul 16, 16:25 UTC1h 0m
2026-07-16 GDERH - Jul 16, 13:30 UTCJul 16, 13:45 UTC15m
2026-07-16 GDERH - Jul 16, 12:09 UTCJul 16, 12:25 UTC15m
2026-07-16 GDERH - Jul 16, 11:05 UTCJul 16, 11:25 UTC20m
2026-07-16 GDERH - Jul 16, 09:40 UTCJul 16, 10:00 UTC20m
2026-07-15 GDERH - Jul 15, 15:40 UTCJul 15, 16:10 UTC30m
2026-07-15 GDERH - Jul 15, 13:55 UTCJul 15, 14:55 UTC1h 0m
2026-07-15 GDERH - Jul 15, 11:15 UTCJul 15, 12:50 UTC1h 35m
2026-07-14 GDERH - Jul 14, 15:00 UTCJul 14, 17:00 UTC2h 0m
2026-07-14 GDERH - Jul 14, 10:15 UTCJul 14, 12:30 UTC2h 15m
2026-07-13 GDERH - Jul 13, 11:55 UTCJul 13, 15:30 UTC3h 35m
2026-07-12 GDERH - Jul 12, 13:40 UTCJul 12, 14:40 UTC1h 0m
2026-07-12 GDERH - Jul 12, 12:25 UTCJul 12, 13:05 UTC40m
2026-07-12 GDERH - Jul 12, 10:01 UTCJul 12, 10:20 UTC20m
2026-07-11 GDERH - Jul 11, 14:05 UTCJul 11, 15:20 UTC1h 15m
2026-07-11 GDERH - Jul 11, 13:10 UTCJul 11, 13:25 UTC15m
2026-07-11 GDERH - Jul 11, 11:35 UTCJul 11, 11:45 UTC10m
2026-07-11 GDERH - Jul 11, 10:35 UTCJul 11, 10:45 UTC10m
2026-07-09 GDERH - Jul 9, 16:00 UTCJul 9, 16:40 UTC40m
2026-07-09 GDERH - Jul 9, 14:50 UTCJul 9, 15:25 UTC35m
2026-07-09 GDERH - Jul 9, 11:50 UTCJul 9, 12:35 UTC45m
2026-07-09 GDERH - Jul 9, 10:45 UTCJul 9, 11:10 UTC25m
2026-07-04 GDERH - Jul 4, 10:20 UTCJul 4, 12:05 UTC1h 45m
2026-06-29 GDERH - Jun 29, 13:59 UTCJun 29, 16:19 UTC2h 20m
2026-06-29 GDERH - Jun 29, 12:00 UTCJun 29, 12:49 UTC50m
2026-06-28 GDERH - Jun 28, 15:40 UTCJun 28, 17:10 UTC1h 30m
2026-06-28 GDERH - Jun 28, 14:09 UTCJun 28, 14:30 UTC20m
2026-06-28 GDERH - Jun 28, 13:19 UTCJun 28, 13:34 UTC15m
2026-06-28 GDERH - Jun 28, 12:15 UTCJun 28, 12:35 UTC20m
2026-06-25 GDERH - Jun 25, 16:14 UTCJun 25, 17:09 UTC55m
2026-06-21 GDERH - Jun 21, 14:54 UTCJun 21, 15:05 UTC10m
2026-06-21 GDERH - Jun 21, 13:54 UTCJun 21, 14:19 UTC25m
2026-06-21 GDERH - Jun 21, 11:49 UTCJun 21, 12:14 UTC25m
2026-06-21 - - Jun 21, 10:19 UTCJun 21, 10:29 UTC10m
2026-06-20 GDERH - Jun 20, 14:35 UTCJun 20, 15:09 UTC35m
2026-06-20 GDERH - Jun 20, 12:59 UTCJun 20, 13:49 UTC50m
2026-06-20 GDERH - Jun 20, 10:20 UTCJun 20, 11:05 UTC45m
2026-06-16 GDERH - Jun 16, 15:40 UTCJun 16, 16:20 UTC40m
2026-06-16 GDERH - Jun 16, 10:15 UTCJun 16, 15:00 UTC4h 45m
2026-06-14 GDERH - Jun 14, 10:40 UTCJun 14, 12:20 UTC1h 40m
2026-06-14 GDERH - Jun 14, 09:45 UTCJun 14, 10:00 UTC15m
2026-06-13 GDERH - Jun 13, 15:15 UTCJun 13, 15:45 UTC30m
2026-06-13 GDERH - Jun 13, 14:05 UTCJun 13, 14:15 UTC10m
2026-06-13 GDERH - Jun 13, 12:20 UTCJun 13, 13:20 UTC1h 0m
2026-06-13 GDERH - Jun 13, 11:25 UTCJun 13, 11:45 UTC20m
2026-06-07 GDERH - Jun 7, 13:15 UTCJun 7, 13:25 UTC10m

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

Mode-S 405761 frequently asked

What is Mode-S code 405761?
405761 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-DERH.
Where is Mode-S 405761 registered?
Mode-S code 405761 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 405761 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 405761, octal 20053541, decimal 4,216,673.
What flights does 405761 operate?
Mode-S 405761 has broadcast 1 distinct callsign, including GDERH.