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sensors Mode-S transponder

3DD741

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-HBTP

Hex
3DD741
Octal
17353501
Decimal
4,052,801
Country
DE
Tail
D-HBTP
Type
EC45
No current signal · last broadcast 12d ago
Flights observed
92
Distinct callsigns
10
Country
DE
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S 3DD741.

Country allocation

The ICAO 24-bit address 3DD741 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 10 distinct

Callsign Airline Flights Last seen
RDF28 - 31 2026-07-17
RDF23 - 16 2026-07-24
RDF39 - 12 2026-06-03
RDF9 - 11 2026-06-16
RDF20 - 11 2026-06-26
RDF6 - 4 2026-05-20
RDF19 - 4 2026-06-10
RDF30 - 1 2026-06-03
RDF29 - 1 2026-05-04
RDF17 - 1 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 RDF23 - Jul 24, 07:30 UTCJul 24, 08:40 UTC1h 10m
2026-07-23 RDF23 - Jul 23, 11:30 UTCJul 23, 11:40 UTC10m
2026-07-23 RDF23 - Jul 23, 10:20 UTCJul 23, 11:25 UTC1h 5m
2026-07-23 RDF23 - Jul 23, 07:05 UTCJul 23, 08:20 UTC1h 15m
2026-07-22 RDF23 - Jul 22, 11:10 UTCJul 22, 12:05 UTC55m
2026-07-21 RDF23 - Jul 21, 11:00 UTCJul 21, 12:05 UTC1h 5m
2026-07-21 RDF23 IGS → IGS Jul 21, 07:30 UTCJul 21, 08:35 UTC1h 5m
2026-07-20 RDF23 IGS → IGS Jul 20, 12:50 UTCJul 20, 14:15 UTC1h 25m
2026-07-20 RDF23 - Jul 20, 10:55 UTCJul 20, 12:10 UTC1h 15m
2026-07-17 RDF28 IGS → IGS Jul 17, 08:35 UTCJul 17, 09:45 UTC1h 10m
2026-07-17 RDF28 - Jul 17, 07:14 UTCJul 17, 08:04 UTC50m
2026-07-16 RDF28 - Jul 16, 11:25 UTCJul 16, 12:34 UTC1h 10m
2026-07-16 RDF28 - Jul 16, 07:15 UTCJul 16, 08:30 UTC1h 15m
2026-07-15 RDF28 IGS → IGS Jul 15, 11:20 UTCJul 15, 12:30 UTC1h 10m
2026-07-15 RDF28 - Jul 15, 07:40 UTCJul 15, 08:50 UTC1h 10m
2026-07-14 RDF28 - Jul 14, 11:20 UTCJul 14, 12:05 UTC45m
2026-07-14 RDF28 IGS → IGS Jul 14, 07:55 UTCJul 14, 09:00 UTC1h 5m
2026-07-02 RDF28 IGS → IGS Jul 2, 10:05 UTCJul 2, 10:55 UTC50m
2026-07-02 RDF28 - Jul 2, 07:30 UTCJul 2, 08:25 UTC55m
2026-07-01 RDF17 - Jul 1, 12:05 UTCJul 1, 12:20 UTC15m
2026-07-01 RDF28 - Jul 1, 10:05 UTCJul 1, 11:15 UTC1h 10m
2026-07-01 RDF28 IGS → IGS Jul 1, 06:55 UTCJul 1, 08:00 UTC1h 5m
2026-06-30 RDF28 IGS → IGS Jun 30, 10:00 UTCJun 30, 11:25 UTC1h 25m
2026-06-30 RDF28 - Jun 30, 07:00 UTCJun 30, 08:20 UTC1h 20m
2026-06-29 RDF28 - Jun 29, 10:10 UTCJun 29, 11:35 UTC1h 25m
2026-06-29 RDF28 - Jun 29, 07:05 UTCJun 29, 08:39 UTC1h 35m
2026-06-26 RDF28 IGS → IGS Jun 26, 08:50 UTCJun 26, 09:39 UTC50m
2026-06-26 RDF20 - Jun 26, 07:10 UTCJun 26, 07:55 UTC45m
2026-06-25 RDF20 - Jun 25, 12:44 UTCJun 25, 13:29 UTC45m
2026-06-25 RDF28 IGS → IGS Jun 25, 11:10 UTCJun 25, 11:54 UTC45m
2026-06-25 RDF20 - Jun 25, 08:55 UTCJun 25, 09:55 UTC1h 0m
2026-06-25 RDF28 - Jun 25, 07:15 UTCJun 25, 07:59 UTC45m
2026-06-24 RDF20 - Jun 24, 13:00 UTCJun 24, 14:00 UTC1h 0m
2026-06-24 RDF20 - Jun 24, 11:14 UTCJun 24, 12:20 UTC1h 5m
2026-06-24 RDF28 - Jun 24, 09:05 UTCJun 24, 10:04 UTC1h 0m
2026-06-24 RDF28 - Jun 24, 07:15 UTCJun 24, 08:30 UTC1h 15m
2026-06-23 RDF28 - Jun 23, 13:05 UTCJun 23, 14:15 UTC1h 10m
2026-06-23 RDF20 - Jun 23, 11:10 UTCJun 23, 12:20 UTC1h 10m
2026-06-19 RDF28 - Jun 19, 14:39 UTCJun 19, 14:59 UTC20m
2026-06-19 RDF28 - Jun 19, 12:54 UTCJun 19, 14:29 UTC1h 35m
2026-06-19 RDF28 - Jun 19, 11:45 UTCJun 19, 12:25 UTC40m
2026-06-19 RDF20 - Jun 19, 10:14 UTCJun 19, 10:50 UTC35m
2026-06-19 RDF20 IGS → RBM Jun 19, 09:24 UTCJun 19, 10:04 UTC40m
2026-06-19 RDF20 - Jun 19, 08:20 UTCJun 19, 08:54 UTC35m
2026-06-19 RDF20 - Jun 19, 07:25 UTCJun 19, 08:04 UTC40m
2026-06-17 RDF20 IGS → IGS Jun 17, 13:10 UTCJun 17, 14:05 UTC55m
2026-06-17 RDF28 - Jun 17, 11:20 UTCJun 17, 12:00 UTC40m
2026-06-16 RDF9 IGS → IGS Jun 16, 19:35 UTCJun 16, 21:55 UTC2h 21m
2026-06-16 RDF28 - Jun 16, 09:10 UTCJun 16, 09:55 UTC45m
2026-06-16 RDF28 IGS → IGS Jun 16, 08:25 UTCJun 16, 08:30 UTC5m

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

Mode-S 3DD741 frequently asked

What is Mode-S code 3DD741?
3DD741 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-HBTP.
Where is Mode-S 3DD741 registered?
Mode-S code 3DD741 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3DD741 broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3DD741, octal 17353501, decimal 4,052,801.
What flights does 3DD741 operate?
Mode-S 3DD741 has broadcast 10 distinct callsigns, including RDF28, RDF23, RDF39, RDF9, RDF20.