Apparatus

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sensors Mode-S transponder

3C7439

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AMAY · BOEING 737 MAX 8

Hex
3C7439
Octal
17072071
Decimal
3,961,913
Country
DE
Tail
D-AMAY
Type
B38M
No current signal · last broadcast 5h ago
Flights observed
172
Distinct callsigns
20
Country
DE
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 3C7439.

Country allocation

The ICAO 24-bit address 3C7439 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
TUI23X TUIfly 29 2026-05-29
TUI2DJ TUIfly 28 2026-05-29
TUI2XA - 14 2026-05-28
TUI32H TUIfly 12 2026-05-25
TUI4D TUIfly 11 2026-05-24
TUI8L TUIfly 10 2026-05-29
TUI4YJ TUIfly 8 2026-05-25
TUI68K TUIfly 7 2026-05-27
TUI10D TUIfly 7 2026-05-27
TUI8FH TUIfly 5 2026-05-02
TUI60A TUIfly 5 2026-05-12
TUI9EV - 4 2026-05-02
TUI7GM TUIfly 4 2026-05-26
TUI7DG TUIfly 4 2026-05-26
TUI68M - 4 2026-05-27
TUI4CY - 4 2026-05-27
TUI22H TUIfly 4 2026-05-19
TUI8XA TUIfly 2 2026-05-26
TUI8951 TUIfly 2 2026-04-22
TUI8928 TUIfly 2 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 TUI8L LPA → STR May 29, 11:45 UTCMay 29, 21:20 UTC9h 35m
2026-05-29 TUI23X PMI → STR May 29, 07:25 UTCMay 29, 09:15 UTC1h 50m
2026-05-29 TUI2DJ STR → PMI May 29, 04:05 UTCMay 29, 05:35 UTC1h 30m
2026-05-28 TUI2XA STR → STR May 28, 05:00 UTCMay 28, 19:20 UTC14h 20m
2026-05-27 TUI10D KGS → STR May 27, 16:15 UTCMay 27, 19:00 UTC2h 45m
2026-05-27 TUI68K STR → KGS May 27, 12:30 UTCMay 27, 15:00 UTC2h 30m
2026-05-27 TUI68M RHO → STR May 27, 08:30 UTCMay 27, 11:20 UTC2h 50m
2026-05-27 TUI4CY STR → RHO May 27, 04:19 UTCMay 27, 07:15 UTC2h 56m
2026-05-26 TUI4JT - May 26, 18:19 UTCMay 26, 21:00 UTC2h 40m
2026-05-26 TUI4JT - May 26, 17:25 UTCMay 26, 17:39 UTC15m
2026-05-26 TUI8XA STR → FNC May 26, 16:10 UTCMay 26, 16:20 UTC10m
2026-05-26 TUI8XA STR → FNC May 26, 12:35 UTCMay 26, 15:24 UTC2h 50m
2026-05-26 TUI7GM HER → STR May 26, 08:19 UTCMay 26, 10:44 UTC2h 25m
2026-05-26 TUI7DG STR → HER May 26, 04:20 UTCMay 26, 06:54 UTC2h 35m
2026-05-25 TUI4YJ FUE → STR May 25, 17:20 UTCMay 25, 21:09 UTC3h 49m
2026-05-25 TUI32H STR → FUE May 25, 12:00 UTCMay 25, 15:55 UTC3h 55m
2026-05-25 TUI10D KGS → STR May 25, 08:05 UTCMay 25, 10:40 UTC2h 35m
2026-05-25 TUI68K STR → KGS May 25, 04:05 UTCMay 25, 06:45 UTC2h 40m
2026-05-24 TUI8L LPA → STR May 24, 16:00 UTCMay 24, 19:55 UTC3h 55m
2026-05-24 TUI4D STR → LPA May 24, 10:30 UTCMay 24, 14:30 UTC4h 0m
2026-05-24 TUI23X PMI → STR May 24, 07:30 UTCMay 24, 09:20 UTC1h 50m
2026-05-24 TUI2DJ STR → PMI May 24, 04:10 UTCMay 24, 05:50 UTC1h 40m
2026-05-23 TUI4YJ FUE → STR May 23, 17:35 UTCMay 23, 21:25 UTC3h 50m
2026-05-23 TUI32H STR → FUE May 23, 12:10 UTCMay 23, 16:05 UTC3h 55m
2026-05-23 TUI10D KGS → STR May 23, 08:15 UTCMay 23, 10:55 UTC2h 40m
2026-05-23 TUI68K STR → KGS May 23, 04:10 UTCMay 23, 06:40 UTC2h 30m
2026-05-22 TUI8L LPA → STR May 22, 17:45 UTCMay 22, 21:25 UTC3h 40m
2026-05-22 TUI4D STR → LPA May 22, 11:55 UTCMay 22, 16:00 UTC4h 5m
2026-05-22 TUI23X PMI → STR May 22, 07:05 UTCMay 22, 08:50 UTC1h 45m
2026-05-22 TUI2DJ STR → PMI May 22, 04:05 UTCMay 22, 05:45 UTC1h 40m
2026-05-21 TUI2XA - May 21, 15:35 UTCMay 21, 19:25 UTC3h 50m
2026-05-21 TUI2XA - May 21, 05:00 UTCMay 21, 09:00 UTC4h 0m
2026-05-20 TUI10D KGS → STR May 20, 16:15 UTCMay 20, 18:55 UTC2h 40m
2026-05-20 TUI68K STR → KGS May 20, 12:30 UTCMay 20, 15:00 UTC2h 30m
2026-05-20 TUI68M RHO → STR May 20, 08:10 UTCMay 20, 11:00 UTC2h 50m
2026-05-20 TUI4CY STR → RHO May 20, 04:25 UTCMay 20, 07:00 UTC2h 36m
2026-05-19 TUI22H STR → HRG May 19, 10:10 UTCMay 19, 19:55 UTC9h 45m
2026-05-19 TUI23X PMI → STR May 19, 07:00 UTCMay 19, 08:45 UTC1h 45m
2026-05-19 TUI2DJ STR → PMI May 19, 04:05 UTCMay 19, 05:40 UTC1h 35m
2026-05-18 TUI4YJ FUE → STR May 18, 17:30 UTCMay 18, 21:15 UTC3h 44m
2026-05-18 TUI32H STR → FUE May 18, 12:10 UTCMay 18, 15:35 UTC3h 25m
2026-05-18 TUI23X PMI → STR May 18, 08:25 UTCMay 18, 10:10 UTC1h 45m
2026-05-18 TUI2DJ STR → PMI May 18, 05:00 UTCMay 18, 06:40 UTC1h 40m
2026-05-17 TUI8L LPA → STR May 17, 17:10 UTCMay 17, 19:45 UTC2h 35m
2026-05-17 TUI4D STR → LPA May 17, 10:20 UTCMay 17, 14:15 UTC3h 55m
2026-05-17 TUI23X PMI → STR May 17, 07:15 UTCMay 17, 08:55 UTC1h 40m
2026-05-17 TUI2DJ STR → PMI May 17, 04:10 UTCMay 17, 05:50 UTC1h 40m
2026-05-16 TUI68M RHO → STR May 16, 18:15 UTCMay 16, 21:15 UTC3h 0m
2026-05-16 TUI4CY STR → RHO May 16, 14:11 UTCMay 16, 16:45 UTC2h 35m
2026-05-16 TUI7GM HER → STR May 16, 10:20 UTCMay 16, 12:55 UTC2h 35m

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

Mode-S 3C7439 frequently asked

What is Mode-S code 3C7439?
3C7439 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AMAY.
Where is Mode-S 3C7439 registered?
Mode-S code 3C7439 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C7439 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C7439, octal 17072071, decimal 3,961,913.
What flights does 3C7439 operate?
Mode-S 3C7439 has broadcast 20 distinct callsigns, including TUI23X, TUI2DJ, TUI2XA, TUI32H, TUI4D.