Apparatus

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sensors Mode-S transponder

40137B

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-RODJ · IKARUS C-42 Bison

Hex
40137B
Octal
20011573
Decimal
4,199,291
Country
GB
Tail
G-RODJ
Type
C42
No current signal · last broadcast 1d ago
Flights observed
63
Distinct callsigns
1
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 40137B.

Country allocation

The ICAO 24-bit address 40137B 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
GRODJ - 63 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 GRODJ - Jul 21, 08:20 UTCJul 21, 08:50 UTC30m
2026-07-20 GRODJ - Jul 20, 15:55 UTCJul 20, 16:35 UTC40m
2026-07-20 GRODJ - Jul 20, 13:55 UTCJul 20, 14:40 UTC45m
2026-07-19 GRODJ - Jul 19, 11:40 UTCJul 19, 12:35 UTC55m
2026-07-19 GRODJ - Jul 19, 09:10 UTCJul 19, 10:10 UTC1h 0m
2026-07-16 GRODJ - Jul 16, 11:05 UTCJul 16, 11:54 UTC50m
2026-07-15 GRODJ - Jul 15, 13:05 UTCJul 15, 13:35 UTC30m
2026-07-15 GRODJ - Jul 15, 09:00 UTCJul 15, 09:15 UTC15m
2026-07-12 GRODJ - Jul 12, 18:15 UTCJul 12, 19:01 UTC45m
2026-07-11 GRODJ - Jul 11, 14:10 UTCJul 11, 14:40 UTC30m
2026-07-11 GRODJ - Jul 11, 11:10 UTCJul 11, 12:30 UTC1h 20m
2026-07-11 GRODJ - Jul 11, 09:30 UTCJul 11, 10:05 UTC35m
2026-07-10 GRODJ - Jul 10, 12:25 UTCJul 10, 13:10 UTC45m
2026-07-10 GRODJ - Jul 10, 09:45 UTCJul 10, 10:25 UTC40m
2026-07-08 GRODJ - Jul 8, 16:35 UTCJul 8, 17:50 UTC1h 15m
2026-07-08 GRODJ - Jul 8, 15:50 UTCJul 8, 16:00 UTC10m
2026-07-08 GRODJ - Jul 8, 10:35 UTCJul 8, 12:40 UTC2h 5m
2026-06-27 GRODJ - Jun 27, 16:14 UTCJun 27, 16:39 UTC25m
2026-06-27 GRODJ - Jun 27, 15:10 UTCJun 27, 15:30 UTC20m
2026-06-27 GRODJ - Jun 27, 14:20 UTCJun 27, 14:39 UTC20m
2026-06-27 GRODJ - Jun 27, 12:45 UTCJun 27, 13:04 UTC20m
2026-06-27 GRODJ - Jun 27, 11:44 UTCJun 27, 12:15 UTC30m
2026-06-27 GRODJ - Jun 27, 10:40 UTCJun 27, 11:00 UTC20m
2026-06-26 GRODJ - Jun 26, 10:15 UTCJun 26, 11:20 UTC1h 5m
2026-06-21 GRODJ - Jun 21, 13:39 UTCJun 21, 14:15 UTC35m
2026-06-21 GRODJ - Jun 21, 09:00 UTCJun 21, 09:29 UTC30m
2026-06-20 GRODJ - Jun 20, 15:29 UTCJun 20, 15:39 UTC10m
2026-06-20 GRODJ - Jun 20, 13:49 UTCJun 20, 14:14 UTC25m
2026-06-20 GRODJ - Jun 20, 12:34 UTCJun 20, 13:14 UTC40m
2026-06-20 GRODJ - Jun 20, 11:14 UTCJun 20, 11:44 UTC30m
2026-06-20 GRODJ - Jun 20, 09:59 UTCJun 20, 10:34 UTC35m
2026-06-19 GRODJ - Jun 19, 16:04 UTCJun 19, 17:04 UTC1h 0m
2026-06-19 GRODJ - Jun 19, 14:59 UTCJun 19, 15:24 UTC25m
2026-06-19 GRODJ - Jun 19, 09:14 UTCJun 19, 10:35 UTC1h 20m
2026-06-18 GRODJ - Jun 18, 19:30 UTCJun 18, 20:30 UTC1h 0m
2026-06-18 GRODJ - Jun 18, 15:10 UTCJun 18, 16:15 UTC1h 5m
2026-06-18 GRODJ - Jun 18, 13:20 UTCJun 18, 13:55 UTC35m
2026-06-16 GRODJ - Jun 16, 11:49 UTCJun 16, 13:55 UTC2h 5m
2026-06-15 GRODJ - Jun 15, 16:15 UTCJun 15, 17:25 UTC1h 10m
2026-06-15 GRODJ - Jun 15, 14:00 UTCJun 15, 14:45 UTC45m
2026-06-15 GRODJ - Jun 15, 09:35 UTCJun 15, 10:09 UTC35m
2026-06-14 GRODJ - Jun 14, 11:25 UTCJun 14, 11:35 UTC10m
2026-05-21 GRODJ - May 21, 17:15 UTCMay 21, 17:25 UTC10m
2026-05-16 GRODJ - May 16, 13:25 UTCMay 16, 13:41 UTC15m
2026-05-16 GRODJ - May 16, 08:20 UTCMay 16, 08:51 UTC30m
2026-05-10 GRODJ - May 10, 13:49 UTCMay 10, 14:30 UTC40m
2026-05-10 GRODJ - May 10, 11:25 UTCMay 10, 12:30 UTC1h 5m
2026-05-10 GRODJ - May 10, 09:20 UTCMay 10, 10:45 UTC1h 25m
2026-05-09 GRODJ - May 9, 18:15 UTCMay 9, 19:05 UTC50m
2026-05-09 GRODJ - May 9, 15:45 UTCMay 9, 17:10 UTC1h 25m

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

Mode-S 40137B frequently asked

What is Mode-S code 40137B?
40137B is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-RODJ.
Where is Mode-S 40137B registered?
Mode-S code 40137B 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 40137B broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40137B, octal 20011573, decimal 4,199,291.
What flights does 40137B operate?
Mode-S 40137B has broadcast 1 distinct callsign, including GRODJ.