Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

3DB661

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-GPHX · DIAMOND DA-42 Guardian

Hex
3DB661
Octal
17333141
Decimal
4,044,385
Country
DE
Tail
D-GPHX
Type
DA42
No current signal · last broadcast 26d ago
Flights observed
79
Distinct callsigns
20
Country
DE
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S 3DB661.

Country allocation

The ICAO 24-bit address 3DB661 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 20 distinct

Callsign Airline Flights Last seen
GAF526 - 23 2026-07-16
PTO3342 - 3 2026-07-07
PTO3382 - 2 2026-07-10
PTO3381 - 2 2026-07-10
PTO3362 - 2 2026-07-02
PTO3358 - 2 2026-07-23
PTO3357 - 2 2026-07-23
PTO3346 - 2 2026-07-15
PTO3341 - 2 2026-07-07
PTO3318 - 2 2026-07-06
PTO3315 - 2 2026-07-13
PTO3314 - 2 2026-06-09
PTO3312 - 2 2026-07-22
PTO3305 - 2 2026-07-09
PTO3304 - 2 2026-07-09
PTO9926 - 1 2026-06-05
PTO9925 - 1 2026-06-05
PTO3398 - 1 2026-06-16
PTO3394 - 1 2026-06-16
PTO3391 - 1 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 PTO3358 - Jul 23, 10:10 UTCJul 23, 12:20 UTC2h 10m
2026-07-23 PTO3357 - Jul 23, 06:30 UTCJul 23, 08:45 UTC2h 15m
2026-07-22 PTO3312 - Jul 22, 11:10 UTCJul 22, 12:55 UTC1h 45m
2026-07-21 PTO3368 POZ → RLG Jul 21, 11:40 UTCJul 21, 13:30 UTC1h 50m
2026-07-21 PTO3367 RLG → POZ Jul 21, 07:40 UTCJul 21, 10:15 UTC2h 35m
2026-07-20 PTO3385 BRE → RLG Jul 20, 11:30 UTCJul 20, 13:35 UTC2h 5m
2026-07-20 PTO3384 - Jul 20, 07:40 UTCJul 20, 09:55 UTC2h 15m
2026-07-16 GAF526 - Jul 16, 11:05 UTCJul 16, 13:30 UTC2h 25m
2026-07-16 GAF526 - Jul 16, 07:40 UTCJul 16, 09:35 UTC1h 55m
2026-07-15 PTO3347 - Jul 15, 12:30 UTCJul 15, 14:40 UTC2h 10m
2026-07-15 PTO3346 - Jul 15, 08:00 UTCJul 15, 09:45 UTC1h 45m
2026-07-14 GAF526 FMO → RLG Jul 14, 12:30 UTCJul 14, 14:00 UTC1h 30m
2026-07-14 GAF526 - Jul 14, 08:40 UTCJul 14, 11:30 UTC2h 50m
2026-07-13 PTO3316 - Jul 13, 12:05 UTCJul 13, 14:20 UTC2h 15m
2026-07-13 PTO3315 RLG → BRE Jul 13, 08:25 UTCJul 13, 10:30 UTC2h 5m
2026-07-10 PTO3382 ERF → RLG Jul 10, 09:45 UTCJul 10, 11:55 UTC2h 10m
2026-07-10 PTO3381 - Jul 10, 06:35 UTCJul 10, 08:45 UTC2h 10m
2026-07-09 PTO3305 - Jul 9, 17:45 UTCJul 9, 18:40 UTC55m
2026-07-09 PTO3304 - Jul 9, 13:10 UTCJul 9, 14:10 UTC1h 0m
2026-07-09 PTO3302 KID → RLG Jul 9, 09:40 UTCJul 9, 12:15 UTC2h 35m
2026-07-09 PTO3301 - Jul 9, 06:20 UTCJul 9, 08:30 UTC2h 10m
2026-07-08 PTO3374 RLG → RLG Jul 8, 10:35 UTCJul 8, 13:00 UTC2h 25m
2026-07-08 PTO3372 - Jul 8, 06:45 UTCJul 8, 08:50 UTC2h 5m
2026-07-07 PTO3342 - Jul 7, 13:15 UTCJul 7, 14:30 UTC1h 15m
2026-07-07 PTO3342 - Jul 7, 12:10 UTCJul 7, 12:40 UTC30m
2026-07-07 PTO3341 - Jul 7, 09:45 UTCJul 7, 10:10 UTC25m
2026-07-07 PTO3341 - Jul 7, 08:05 UTCJul 7, 09:05 UTC1h 0m
2026-07-06 PTO3319 - Jul 6, 10:35 UTCJul 6, 12:50 UTC2h 15m
2026-07-06 PTO3318 - Jul 6, 08:35 UTCJul 6, 09:25 UTC50m
2026-07-06 PTO3318 - Jul 6, 07:20 UTCJul 6, 07:55 UTC35m
2026-07-03 PTO3391 - Jul 3, 09:55 UTCJul 3, 12:20 UTC2h 25m
2026-07-03 PTO3390 - Jul 3, 06:35 UTCJul 3, 08:45 UTC2h 10m
2026-07-02 GAF526 - Jul 2, 12:15 UTCJul 2, 13:20 UTC1h 5m
2026-07-02 PTO3362 - Jul 2, 09:50 UTCJul 2, 10:25 UTC35m
2026-06-19 PTO3362 RKE → RLG Jun 19, 10:59 UTCJun 19, 13:34 UTC2h 35m
2026-06-19 PTO3361 - Jun 19, 07:39 UTCJun 19, 09:34 UTC1h 55m
2026-06-18 GAF526 - Jun 18, 14:10 UTCJun 18, 16:50 UTC2h 40m
2026-06-18 GAF526 - Jun 18, 09:55 UTCJun 18, 12:35 UTC2h 40m
2026-06-17 PTO3321 - Jun 17, 11:45 UTCJun 17, 13:35 UTC1h 50m
2026-06-17 PTO3320 - Jun 17, 07:45 UTCJun 17, 09:40 UTC1h 55m
2026-06-16 PTO3394 RLG → RLG Jun 16, 11:55 UTCJun 16, 13:50 UTC1h 55m
2026-06-16 PTO3398 - Jun 16, 07:20 UTCJun 16, 09:40 UTC2h 20m
2026-06-15 PTO3306 - Jun 15, 13:10 UTCJun 15, 13:50 UTC40m
2026-06-15 PTO3305 RLG → RLG Jun 15, 11:19 UTCJun 15, 11:54 UTC35m
2026-06-15 PTO3304 RLG → RLG Jun 15, 09:40 UTCJun 15, 10:24 UTC45m
2026-06-12 PTO3382 - Jun 12, 13:00 UTCJun 12, 15:15 UTC2h 15m
2026-06-12 PTO3381 - Jun 12, 09:30 UTCJun 12, 11:30 UTC2h 0m
2026-06-12 GAF526 - Jun 12, 06:45 UTCJun 12, 08:05 UTC1h 20m
2026-06-11 GAF526 - Jun 11, 12:20 UTCJun 11, 15:00 UTC2h 40m
2026-06-11 GAF526 - Jun 11, 07:55 UTCJun 11, 10:50 UTC2h 55m

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

Mode-S 3DB661 frequently asked

What is Mode-S code 3DB661?
3DB661 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-GPHX.
Where is Mode-S 3DB661 registered?
Mode-S code 3DB661 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3DB661 broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3DB661, octal 17333141, decimal 4,044,385.
What flights does 3DB661 operate?
Mode-S 3DB661 has broadcast 20 distinct callsigns, including GAF526, PTO3342, PTO3382, PTO3381, PTO3362.