Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

40838E

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-THDA · AGUSTA AW-109 Grand

Hex
40838E
Octal
20101616
Decimal
4,227,982
Country
GB
Tail
G-THDA
Type
A109
No current signal · last broadcast 1d ago
Flights observed
177
Distinct callsigns
4
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 40838E.

Country allocation

The ICAO 24-bit address 40838E 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 4 distinct

Callsign Airline Flights Last seen
SXN21 - 138 2026-07-12
GTHDA - 15 2026-07-03
BLACK05 - 14 2026-06-20
JKY205 - 10 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 SXN21 - Jul 12, 12:45 UTCJul 12, 13:20 UTC35m
2026-07-12 SXN21 - Jul 12, 08:55 UTCJul 12, 09:40 UTC45m
2026-07-11 SXN21 - Jul 11, 16:15 UTCJul 11, 17:00 UTC45m
2026-07-11 SXN21 - Jul 11, 07:40 UTCJul 11, 08:01 UTC20m
2026-07-11 SXN21 - Jul 11, 07:10 UTCJul 11, 07:20 UTC10m
2026-07-10 SXN21 - Jul 10, 13:40 UTCJul 10, 14:20 UTC40m
2026-07-10 SXN21 - Jul 10, 10:20 UTCJul 10, 10:30 UTC10m
2026-07-10 SXN21 - Jul 10, 08:15 UTCJul 10, 09:15 UTC1h 0m
2026-07-08 SXN21 - Jul 8, 16:45 UTCJul 8, 16:55 UTC10m
2026-07-08 SXN21 - Jul 8, 16:00 UTCJul 8, 16:40 UTC40m
2026-07-08 SXN21 - Jul 8, 15:05 UTCJul 8, 15:15 UTC10m
2026-07-08 SXN21 - Jul 8, 10:50 UTCJul 8, 11:45 UTC55m
2026-07-08 SXN21 - Jul 8, 10:30 UTCJul 8, 10:45 UTC15m
2026-07-07 SXN21 - Jul 7, 08:15 UTCJul 7, 09:45 UTC1h 30m
2026-07-06 SXN21 - Jul 6, 16:45 UTCJul 6, 16:55 UTC10m
2026-07-06 SXN21 - Jul 6, 15:35 UTCJul 6, 16:35 UTC1h 0m
2026-07-06 SXN21 - Jul 6, 11:40 UTCJul 6, 13:25 UTC1h 45m
2026-07-06 SXN21 - Jul 6, 09:50 UTCJul 6, 10:30 UTC40m
2026-07-06 SXN21 - Jul 6, 08:10 UTCJul 6, 08:25 UTC15m
2026-07-05 JKY205 - Jul 5, 16:25 UTCJul 5, 18:45 UTC2h 20m
2026-07-05 JKY205 - Jul 5, 10:05 UTCJul 5, 10:40 UTC35m
2026-07-05 JKY205 - Jul 5, 09:45 UTCJul 5, 09:55 UTC10m
2026-07-05 JKY205 - Jul 5, 08:05 UTCJul 5, 08:50 UTC45m
2026-07-05 JKY205 - Jul 5, 07:45 UTCJul 5, 08:00 UTC15m
2026-07-04 JKY205 - Jul 4, 16:45 UTCJul 4, 17:50 UTC1h 5m
2026-07-04 JKY205 - Jul 4, 15:50 UTCJul 4, 16:10 UTC20m
2026-07-04 JKY205 - Jul 4, 10:35 UTCJul 4, 11:15 UTC40m
2026-07-04 JKY205 - Jul 4, 09:20 UTCJul 4, 09:50 UTC30m
2026-07-04 JKY205 - Jul 4, 07:50 UTCJul 4, 09:00 UTC1h 10m
2026-07-03 GTHDA - Jul 3, 18:40 UTCJul 3, 20:10 UTC1h 30m
2026-06-23 SXN21 - Jun 23, 06:19 UTCJun 23, 06:29 UTC10m
2026-06-23 SXN21 - Jun 23, 05:20 UTCJun 23, 06:09 UTC50m
2026-06-22 SXN21 - Jun 22, 15:40 UTCJun 22, 15:59 UTC20m
2026-06-22 SXN21 - Jun 22, 09:45 UTCJun 22, 11:19 UTC1h 35m
2026-06-22 SXN21 - Jun 22, 07:25 UTCJun 22, 08:04 UTC40m
2026-06-20 BLACK05 - Jun 20, 17:04 UTCJun 20, 17:39 UTC35m
2026-06-20 BLACK05 - Jun 20, 13:24 UTCJun 20, 14:14 UTC50m
2026-06-20 BLACK05 - Jun 20, 09:24 UTCJun 20, 09:44 UTC20m
2026-06-20 BLACK05 - Jun 20, 09:09 UTCJun 20, 09:19 UTC10m
2026-06-19 BLACK05 - Jun 19, 17:24 UTCJun 19, 17:55 UTC30m
2026-06-19 BLACK05 - Jun 19, 09:34 UTCJun 19, 10:09 UTC35m
2026-06-18 BLACK05 - Jun 18, 18:00 UTCJun 18, 18:45 UTC45m
2026-06-18 BLACK05 - Jun 18, 16:00 UTCJun 18, 17:15 UTC1h 15m
2026-06-18 BLACK05 - Jun 18, 10:05 UTCJun 18, 11:00 UTC55m
2026-06-17 BLACK05 - Jun 17, 17:55 UTCJun 17, 18:35 UTC40m
2026-06-17 BLACK05 - Jun 17, 09:40 UTCJun 17, 09:55 UTC15m
2026-06-17 BLACK05 - Jun 17, 09:15 UTCJun 17, 09:35 UTC20m
2026-06-16 BLACK05 - Jun 16, 17:35 UTCJun 16, 19:40 UTC2h 5m
2026-06-16 BLACK05 - Jun 16, 08:35 UTCJun 16, 10:45 UTC2h 10m
2026-06-14 SXN21 - Jun 14, 17:50 UTCJun 14, 18:25 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-THDA page for operator, model, and routing details .

Mode-S 40838E frequently asked

What is Mode-S code 40838E?
40838E is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-THDA.
Where is Mode-S 40838E registered?
Mode-S code 40838E 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 40838E 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 40838E, octal 20101616, decimal 4,227,982.
What flights does 40838E operate?
Mode-S 40838E has broadcast 4 distinct callsigns, including SXN21, GTHDA, BLACK05, JKY205.