Apparatus

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sensors Mode-S transponder

3DDC77

ICAO 24-bit transponder address · allocated to Germany

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

Hex
3DDC77
Octal
17356167
Decimal
4,054,135
Country
DE
Tail
D-HDSX
Type
EC45
No current signal · last broadcast 25d ago
Flights observed
434
Distinct callsigns
2
Country
DE
Last broadcast
25d ago

Last known position

Most recent position reported by Mode-S 3DDC77.

Country allocation

The ICAO 24-bit address 3DDC77 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 2 distinct

Callsign Airline Flights Last seen
CHX62 - 431 2026-06-11
DHDSX - 3 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-22 DHDSX - Jun 22, 10:40 UTCJun 22, 10:49 UTC10m
2026-06-22 DHDSX - Jun 22, 09:00 UTCJun 22, 09:10 UTC10m
2026-06-20 DHDSX - Jun 20, 12:59 UTCJun 20, 16:09 UTC3h 10m
2026-06-11 CHX62 - Jun 11, 12:05 UTCJun 11, 12:20 UTC15m
2026-06-11 CHX62 - Jun 11, 11:10 UTCJun 11, 11:55 UTC45m
2026-06-11 CHX62 - Jun 11, 09:55 UTCJun 11, 10:40 UTC45m
2026-06-11 CHX62 - Jun 11, 05:30 UTCJun 11, 05:35 UTC5m
2026-06-10 CHX62 - Jun 10, 19:05 UTCJun 10, 20:05 UTC1h 0m
2026-06-10 CHX62 - Jun 10, 16:00 UTCJun 10, 16:50 UTC50m
2026-06-10 CHX62 - Jun 10, 14:05 UTCJun 10, 14:50 UTC45m
2026-06-10 CHX62 - Jun 10, 11:20 UTCJun 10, 12:55 UTC1h 35m
2026-06-10 CHX62 - Jun 10, 10:35 UTCJun 10, 10:45 UTC10m
2026-06-10 CHX62 - Jun 10, 09:20 UTCJun 10, 09:30 UTC10m
2026-06-09 CHX62 - Jun 9, 17:30 UTCJun 9, 17:40 UTC10m
2026-06-09 CHX62 - Jun 9, 16:45 UTCJun 9, 17:10 UTC25m
2026-06-09 CHX62 - Jun 9, 12:50 UTCJun 9, 14:20 UTC1h 30m
2026-06-09 CHX62 - Jun 9, 12:05 UTCJun 9, 12:15 UTC10m
2026-06-09 CHX62 - Jun 9, 11:40 UTCJun 9, 12:00 UTC20m
2026-06-09 CHX62 - Jun 9, 09:55 UTCJun 9, 10:55 UTC1h 0m
2026-06-09 CHX62 - Jun 9, 03:45 UTCJun 9, 05:15 UTC1h 30m
2026-06-08 CHX62 - Jun 8, 21:55 UTCJun 8, 22:15 UTC20m
2026-06-08 CHX62 - Jun 8, 16:40 UTCJun 8, 16:55 UTC15m
2026-06-08 CHX62 - Jun 8, 15:50 UTCJun 8, 16:10 UTC20m
2026-06-08 CHX62 - Jun 8, 12:25 UTCJun 8, 12:50 UTC25m
2026-06-08 CHX62 - Jun 8, 09:40 UTCJun 8, 10:00 UTC20m
2026-06-08 CHX62 - Jun 8, 08:45 UTCJun 8, 09:05 UTC20m
2026-06-08 CHX62 - Jun 8, 06:05 UTCJun 8, 06:40 UTC35m
2026-06-08 CHX62 - Jun 8, 04:35 UTCJun 8, 05:35 UTC1h 0m
2026-06-07 CHX62 - Jun 7, 16:15 UTCJun 7, 16:30 UTC15m
2026-06-07 CHX62 - Jun 7, 14:55 UTCJun 7, 15:05 UTC10m
2026-06-07 CHX62 - Jun 7, 13:45 UTCJun 7, 13:55 UTC10m
2026-06-07 CHX62 - Jun 7, 12:10 UTCJun 7, 13:15 UTC1h 5m
2026-06-07 CHX62 - Jun 7, 01:45 UTCJun 7, 02:30 UTC45m
2026-06-07 CHX62 - Jun 7, 00:34 UTCJun 7, 01:09 UTC35m
2026-06-06 CHX62 - Jun 6, 23:35 UTCJun 7, 00:00 UTC25m
2026-06-06 CHX62 - Jun 6, 16:50 UTCJun 6, 17:40 UTC50m
2026-06-06 CHX62 - Jun 6, 15:59 UTCJun 6, 16:14 UTC15m
2026-06-06 CHX62 - Jun 6, 15:05 UTCJun 6, 15:39 UTC35m
2026-06-06 CHX62 - Jun 6, 14:04 UTCJun 6, 14:20 UTC15m
2026-06-06 CHX62 - Jun 6, 13:15 UTCJun 6, 13:39 UTC25m
2026-06-06 CHX62 - Jun 6, 11:39 UTCJun 6, 11:45 UTC5m
2026-06-06 CHX62 - Jun 6, 10:45 UTCJun 6, 10:55 UTC10m
2026-06-06 CHX62 - Jun 6, 10:14 UTCJun 6, 10:20 UTC5m
2026-06-06 CHX62 - Jun 6, 09:09 UTCJun 6, 09:19 UTC10m
2026-06-06 CHX62 - Jun 6, 08:50 UTCJun 6, 08:55 UTC5m
2026-06-06 CHX62 - Jun 6, 01:20 UTCJun 6, 02:20 UTC1h 0m
2026-06-06 CHX62 - Jun 6, 00:25 UTCJun 6, 00:35 UTC10m
2026-06-05 CHX62 - Jun 5, 17:25 UTCJun 5, 17:30 UTC5m
2026-06-05 CHX62 - Jun 5, 15:20 UTCJun 5, 16:10 UTC50m
2026-06-05 CHX62 - Jun 5, 13:10 UTCJun 5, 14:25 UTC1h 15m

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

Mode-S 3DDC77 frequently asked

What is Mode-S code 3DDC77?
3DDC77 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-HDSX.
Where is Mode-S 3DDC77 registered?
Mode-S code 3DDC77 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3DDC77 broadcasting right now?
No active broadcast right now. Last signal was 25d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3DDC77, octal 17356167, decimal 4,054,135.
What flights does 3DDC77 operate?
Mode-S 3DDC77 has broadcast 2 distinct callsigns, including CHX62, DHDSX.