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sensors Mode-S transponder

3DD737

ICAO 24-bit transponder address · allocated to Germany

Hex
3DD737
Octal
17353467
Decimal
4,052,791
Country
DE
No current signal · last broadcast Jul 23, 10:30 UTC
Flights observed
117
Distinct callsigns
11
Country
DE
Last broadcast
Jul 23, 10:30 UTC

Last known position

Most recent position reported by Mode-S 3DD737.

Country allocation

The ICAO 24-bit address 3DD737 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 11 distinct

Callsign Airline Flights Last seen
RDF30 - 41 2026-05-19
RDF12 - 31 2026-07-23
RDF23 - 9 2026-06-30
RDF19 - 8 2026-06-18
RDF22 - 7 2026-07-21
RDF21 - 6 2026-07-14
RDF17 - 4 2026-07-22
RDF9 - 3 2026-07-17
RDF28 - 3 2026-05-22
RDF26 - 3 2026-07-16
RDF39 - 2 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 RDF12 - Jul 23, 09:25 UTCJul 23, 10:30 UTC1h 5m
2026-07-23 RDF12 - Jul 23, 07:40 UTCJul 23, 08:45 UTC1h 5m
2026-07-22 RDF17 - Jul 22, 11:50 UTCJul 22, 13:30 UTC1h 40m
2026-07-21 RDF17 - Jul 21, 12:15 UTCJul 21, 14:50 UTC2h 35m
2026-07-21 RDF12 - Jul 21, 09:45 UTCJul 21, 10:55 UTC1h 10m
2026-07-21 RDF22 - Jul 21, 07:10 UTCJul 21, 09:00 UTC1h 50m
2026-07-20 RDF17 - Jul 20, 12:30 UTCJul 20, 14:50 UTC2h 20m
2026-07-20 RDF12 - Jul 20, 09:55 UTCJul 20, 10:45 UTC50m
2026-07-20 RDF22 - Jul 20, 08:50 UTCJul 20, 09:10 UTC20m
2026-07-20 RDF22 - Jul 20, 07:25 UTCJul 20, 08:05 UTC40m
2026-07-17 RDF9 AGB → AGB Jul 17, 07:40 UTCJul 17, 10:15 UTC2h 35m
2026-07-16 RDF22 - Jul 16, 13:20 UTCJul 16, 15:05 UTC1h 45m
2026-07-16 RDF26 - Jul 16, 12:05 UTCJul 16, 12:34 UTC30m
2026-07-16 RDF26 - Jul 16, 11:20 UTCJul 16, 11:34 UTC15m
2026-07-16 RDF9 - Jul 16, 07:30 UTCJul 16, 10:04 UTC2h 35m
2026-07-15 RDF22 - Jul 15, 13:20 UTCJul 15, 13:55 UTC35m
2026-07-15 RDF22 - Jul 15, 12:30 UTCJul 15, 12:40 UTC10m
2026-07-15 RDF22 - Jul 15, 12:05 UTCJul 15, 12:25 UTC20m
2026-07-15 RDF26 - Jul 15, 10:10 UTCJul 15, 10:45 UTC35m
2026-07-15 RDF9 AGB → AGB Jul 15, 07:20 UTCJul 15, 09:10 UTC1h 50m
2026-07-14 RDF21 - Jul 14, 14:50 UTCJul 14, 16:15 UTC1h 25m
2026-06-30 RDF23 - Jun 30, 08:10 UTCJun 30, 08:25 UTC15m
2026-06-26 RDF12 - Jun 26, 09:05 UTCJun 26, 09:45 UTC40m
2026-06-26 RDF12 - Jun 26, 07:10 UTCJun 26, 08:00 UTC50m
2026-06-25 RDF23 - Jun 25, 08:55 UTCJun 25, 09:34 UTC40m
2026-06-25 RDF23 - Jun 25, 07:09 UTCJun 25, 07:54 UTC45m
2026-06-24 RDF23 - Jun 24, 08:49 UTCJun 24, 09:29 UTC40m
2026-06-24 RDF23 - Jun 24, 07:10 UTCJun 24, 07:54 UTC45m
2026-06-23 RDF23 - Jun 23, 08:59 UTCJun 23, 09:54 UTC55m
2026-06-23 RDF23 - Jun 23, 07:05 UTCJun 23, 08:04 UTC1h 0m
2026-06-22 RDF23 - Jun 22, 11:19 UTCJun 22, 12:19 UTC1h 0m
2026-06-22 RDF23 - Jun 22, 08:19 UTCJun 22, 09:24 UTC1h 5m
2026-06-18 RDF19 AGB → AGB Jun 18, 11:25 UTCJun 18, 12:45 UTC1h 20m
2026-06-18 RDF19 - Jun 18, 07:40 UTCJun 18, 08:50 UTC1h 10m
2026-06-17 RDF19 - Jun 17, 11:15 UTCJun 17, 12:40 UTC1h 25m
2026-06-17 RDF19 - Jun 17, 07:30 UTCJun 17, 09:00 UTC1h 30m
2026-06-16 RDF19 - Jun 16, 11:35 UTCJun 16, 13:15 UTC1h 40m
2026-06-16 RDF19 - Jun 16, 07:55 UTCJun 16, 09:40 UTC1h 45m
2026-06-15 RDF19 - Jun 15, 11:49 UTCJun 15, 13:34 UTC1h 45m
2026-06-15 RDF19 - Jun 15, 07:50 UTCJun 15, 09:35 UTC1h 45m
2026-06-11 RDF12 - Jun 11, 12:20 UTCJun 11, 13:05 UTC45m
2026-06-11 RDF12 - Jun 11, 11:30 UTCJun 11, 12:15 UTC45m
2026-06-11 RDF12 - Jun 11, 08:35 UTCJun 11, 09:55 UTC1h 20m
2026-06-10 RDF12 - Jun 10, 12:00 UTCJun 10, 12:45 UTC45m
2026-06-10 RDF12 - Jun 10, 11:30 UTCJun 10, 11:55 UTC25m
2026-06-10 RDF12 - Jun 10, 08:55 UTCJun 10, 09:40 UTC45m
2026-06-10 RDF12 - Jun 10, 08:25 UTCJun 10, 08:40 UTC15m
2026-06-10 RDF12 AGB → AGB Jun 10, 07:15 UTCJun 10, 07:25 UTC10m
2026-06-09 RDF12 AGB → AGB Jun 9, 13:10 UTCJun 9, 13:50 UTC40m
2026-06-09 RDF12 - Jun 9, 11:55 UTCJun 9, 12:30 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.

Mode-S 3DD737 frequently asked

What is Mode-S code 3DD737?
3DD737 is an ICAO 24-bit transponder address. Allocated to Germany.
Where is Mode-S 3DD737 registered?
Mode-S code 3DD737 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3DD737 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 10:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3DD737, octal 17353467, decimal 4,052,791.
What flights does 3DD737 operate?
Mode-S 3DD737 has broadcast 11 distinct callsigns, including RDF30, RDF12, RDF23, RDF19, RDF22.