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sensors Mode-S transponder

3DDC6B

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-HDSL · AIRBUS HELICOPTERS EC-145

Hex
3DDC6B
Octal
17356153
Decimal
4,054,123
Country
DE
Tail
D-HDSL
Type
EC45
No current signal · last broadcast 3h ago
Flights observed
149
Distinct callsigns
3
Country
DE
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 3DDC6B.

Country allocation

The ICAO 24-bit address 3DDC6B falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany 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 3 distinct

Callsign Airline Flights Last seen
CHX81 - 135 2026-06-11
CHX82 - 9 2026-05-11
DHDSL - 5 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-11 CHX81 - Jun 11, 22:55 UTCJun 11, 23:05 UTC10m
2026-06-11 CHX81 - Jun 11, 22:10 UTCJun 11, 22:20 UTC10m
2026-06-11 CHX81 - Jun 11, 21:30 UTCJun 11, 21:40 UTC10m
2026-06-11 CHX81 - Jun 11, 18:50 UTCJun 11, 21:00 UTC2h 10m
2026-06-11 CHX81 - Jun 11, 15:45 UTCJun 11, 16:50 UTC1h 5m
2026-06-11 CHX81 - Jun 11, 14:20 UTCJun 11, 14:55 UTC35m
2026-06-11 CHX81 - Jun 11, 13:00 UTCJun 11, 13:15 UTC15m
2026-06-10 CHX81 - Jun 10, 11:45 UTCJun 10, 12:05 UTC20m
2026-06-10 CHX81 - Jun 10, 10:00 UTCJun 10, 10:45 UTC45m
2026-06-10 CHX81 - Jun 10, 09:15 UTCJun 10, 09:25 UTC10m
2026-06-10 CHX81 - Jun 10, 08:15 UTCJun 10, 08:30 UTC15m
2026-06-10 CHX81 - Jun 10, 05:05 UTCJun 10, 05:15 UTC10m
2026-06-10 CHX81 - Jun 10, 04:25 UTCJun 10, 04:35 UTC10m
2026-06-09 CHX81 - Jun 9, 14:25 UTCJun 9, 15:50 UTC1h 25m
2026-06-09 CHX81 - Jun 9, 10:45 UTCJun 9, 12:10 UTC1h 25m
2026-06-08 CHX81 - Jun 8, 18:25 UTCJun 8, 18:40 UTC15m
2026-06-08 CHX81 - Jun 8, 12:40 UTCJun 8, 14:00 UTC1h 20m
2026-06-08 CHX81 - Jun 8, 09:45 UTCJun 8, 10:30 UTC45m
2026-06-08 CHX81 - Jun 8, 08:50 UTCJun 8, 09:05 UTC15m
2026-06-08 CHX81 - Jun 8, 07:10 UTCJun 8, 07:55 UTC45m
2026-06-08 CHX81 - Jun 8, 06:15 UTCJun 8, 06:25 UTC10m
2026-06-07 CHX81 - Jun 7, 16:45 UTCJun 7, 17:30 UTC45m
2026-06-07 CHX81 - Jun 7, 10:30 UTCJun 7, 11:45 UTC1h 15m
2026-06-07 CHX81 - Jun 7, 03:50 UTCJun 7, 04:15 UTC25m
2026-06-07 CHX81 - Jun 7, 02:35 UTCJun 7, 02:50 UTC15m
2026-06-06 CHX81 - Jun 6, 14:20 UTCJun 6, 14:30 UTC10m
2026-06-06 CHX81 - Jun 6, 13:39 UTCJun 6, 13:49 UTC10m
2026-06-06 CHX81 - Jun 6, 12:40 UTCJun 6, 13:00 UTC20m
2026-06-06 CHX81 - Jun 6, 04:25 UTCJun 6, 05:10 UTC45m
2026-06-06 CHX81 - Jun 6, 00:30 UTCJun 6, 01:35 UTC1h 5m
2026-06-05 CHX81 - Jun 5, 23:40 UTCJun 5, 23:55 UTC15m
2026-06-05 CHX81 - Jun 5, 21:45 UTCJun 5, 22:00 UTC15m
2026-06-05 CHX81 - Jun 5, 20:45 UTCJun 5, 21:05 UTC20m
2026-06-05 CHX81 - Jun 5, 18:10 UTCJun 5, 19:00 UTC50m
2026-06-05 CHX81 - Jun 5, 17:10 UTCJun 5, 17:20 UTC10m
2026-06-05 CHX81 - Jun 5, 16:20 UTCJun 5, 16:35 UTC15m
2026-06-05 CHX81 - Jun 5, 14:40 UTCJun 5, 15:00 UTC20m
2026-06-05 CHX81 - Jun 5, 13:45 UTCJun 5, 14:05 UTC20m
2026-06-05 CHX81 - Jun 5, 09:55 UTCJun 5, 10:30 UTC35m
2026-06-05 CHX81 - Jun 5, 05:50 UTCJun 5, 07:30 UTC1h 40m
2026-06-04 CHX81 - Jun 4, 15:05 UTCJun 4, 15:20 UTC15m
2026-06-04 CHX81 - Jun 4, 13:40 UTCJun 4, 14:00 UTC20m
2026-06-04 CHX81 - Jun 4, 09:25 UTCJun 4, 09:35 UTC10m
2026-06-04 CHX81 - Jun 4, 07:35 UTCJun 4, 08:30 UTC55m
2026-06-03 CHX81 - Jun 3, 18:45 UTCJun 3, 18:55 UTC10m
2026-06-03 CHX81 - Jun 3, 17:05 UTCJun 3, 17:25 UTC20m
2026-06-02 CHX81 - Jun 2, 14:25 UTCJun 2, 15:35 UTC1h 10m
2026-06-02 CHX81 - Jun 2, 13:15 UTCJun 2, 13:30 UTC15m
2026-06-02 CHX81 - Jun 2, 10:15 UTCJun 2, 12:15 UTC2h 0m
2026-06-02 CHX81 - Jun 2, 08:10 UTCJun 2, 08:25 UTC15m

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 D-HDSL page for operator, model, and routing details .

Mode-S 3DDC6B frequently asked

What is Mode-S code 3DDC6B?
3DDC6B is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-HDSL.
Where is Mode-S 3DDC6B registered?
Mode-S code 3DDC6B is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3DDC6B broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3DDC6B, octal 17356153, decimal 4,054,123.
What flights does 3DDC6B operate?
Mode-S 3DDC6B has broadcast 3 distinct callsigns, including CHX81, CHX82, DHDSL.