Apparatus

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sensors Mode-S transponder

3C7421

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AMAA · BOEING 737 MAX 8

Hex
3C7421
Octal
17072041
Decimal
3,961,889
Country
DE
Tail
D-AMAA
Type
B38M
No current signal · last broadcast 3h ago
Flights observed
316
Distinct callsigns
20
Country
DE
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 3C7421.

Country allocation

The ICAO 24-bit address 3C7421 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 - 20 2026-07-14
TUI2DJ - 18 2026-07-14
TUI68K - 15 2026-07-13
TUI10D - 15 2026-07-13
TUI4D - 13 2026-07-13
TUI32H - 12 2026-07-11
TUI8L - 11 2026-07-12
TUI2XA - 9 2026-07-09
TUI4YJ - 7 2026-07-04
TUI50K TUIfly 6 2026-05-11
TUI3GA TUIfly 6 2026-05-15
TUI3C TUIfly 6 2026-05-10
TUI68M - 5 2026-07-06
TUI60A - 5 2026-07-14
TUI5ME TUIfly 5 2026-05-09
TUI5HJ TUIfly 5 2026-05-30
TUI4CY - 5 2026-07-06
TUI8FG - 4 2026-05-17
TUI7JW TUIfly 4 2026-05-08
TUI56C TUIfly 4 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TUI60A - Jul 14, 13:00 UTCJul 14, 19:45 UTC6h 45m
2026-07-14 TUI22H - Jul 14, 10:10 UTCJul 14, 12:45 UTC2h 35m
2026-07-14 TUI23X - Jul 14, 07:10 UTCJul 14, 08:50 UTC1h 40m
2026-07-14 TUI2DJ - Jul 14, 04:05 UTCJul 14, 05:50 UTC1h 45m
2026-07-13 TUI4D STR → STR Jul 13, 11:55 UTCJul 13, 21:35 UTC9h 40m
2026-07-13 TUI10D - Jul 13, 08:01 UTCJul 13, 10:45 UTC2h 45m
2026-07-13 TUI68K STR → KGS Jul 13, 04:10 UTCJul 13, 06:35 UTC2h 25m
2026-07-12 TUI8L - Jul 12, 16:15 UTCJul 12, 19:35 UTC3h 20m
2026-07-12 TUI4D - Jul 12, 10:20 UTCJul 12, 14:20 UTC4h 0m
2026-07-12 TUI23X - Jul 12, 07:15 UTCJul 12, 08:55 UTC1h 40m
2026-07-12 TUI2DJ - Jul 12, 04:15 UTCJul 12, 05:55 UTC1h 40m
2026-07-11 TUI32H STR → STR Jul 11, 12:05 UTCJul 11, 21:00 UTC8h 55m
2026-07-11 TUI10D KGS → STR Jul 11, 08:05 UTCJul 11, 10:45 UTC2h 40m
2026-07-11 TUI68K STR → KGS Jul 11, 04:10 UTCJul 11, 06:45 UTC2h 35m
2026-07-10 TUI8L - Jul 10, 18:10 UTCJul 10, 21:35 UTC3h 25m
2026-07-10 TUI4D - Jul 10, 12:05 UTCJul 10, 15:45 UTC3h 40m
2026-07-10 TUI23X - Jul 10, 07:05 UTCJul 10, 08:45 UTC1h 40m
2026-07-10 TUI2DJ - Jul 10, 04:10 UTCJul 10, 05:45 UTC1h 35m
2026-07-09 TUI2XA STR → STR Jul 9, 05:05 UTCJul 9, 19:00 UTC13h 55m
2026-07-08 TUI10D - Jul 8, 16:50 UTCJul 8, 19:35 UTC2h 45m
2026-07-08 TUI68K STR → KGS Jul 8, 12:30 UTCJul 8, 14:55 UTC2h 25m
2026-07-08 TUI92B - Jul 8, 07:55 UTCJul 8, 10:30 UTC2h 35m
2026-07-08 TUI61X STR → XRY Jul 8, 04:05 UTCJul 8, 06:30 UTC2h 25m
2026-07-07 TUI60A STR → STR Jul 7, 10:40 UTCJul 7, 20:30 UTC9h 50m
2026-07-07 TUI23X - Jul 7, 07:45 UTCJul 7, 09:35 UTC1h 50m
2026-07-07 TUI2DJ - Jul 7, 04:10 UTCJul 7, 05:45 UTC1h 35m
2026-07-06 TUI7GM - Jul 6, 17:20 UTCJul 6, 19:55 UTC2h 35m
2026-07-06 TUI7DG - Jul 6, 13:35 UTCJul 6, 15:55 UTC2h 20m
2026-07-06 TUI68M RHO → STR Jul 6, 09:20 UTCJul 6, 12:15 UTC2h 55m
2026-07-06 TUI4CY STR → RHO Jul 6, 05:10 UTCJul 6, 07:45 UTC2h 35m
2026-07-05 TUI8L - Jul 5, 16:00 UTCJul 5, 19:55 UTC3h 55m
2026-07-05 TUI4D - Jul 5, 10:20 UTCJul 5, 14:20 UTC4h 0m
2026-07-05 TUI23X - Jul 5, 07:15 UTCJul 5, 08:55 UTC1h 40m
2026-07-05 TUI2DJ - Jul 5, 04:15 UTCJul 5, 05:55 UTC1h 40m
2026-07-04 TUI4YJ - Jul 4, 17:20 UTCJul 4, 21:05 UTC3h 45m
2026-07-04 TUI32H - Jul 4, 12:00 UTCJul 4, 15:50 UTC3h 50m
2026-07-04 TUI10D - Jul 4, 07:50 UTCJul 4, 10:35 UTC2h 45m
2026-07-04 TUI68K STR → KGS Jul 4, 04:05 UTCJul 4, 06:45 UTC2h 40m
2026-07-03 TUI8L - Jul 3, 17:40 UTCJul 3, 21:35 UTC3h 55m
2026-07-03 TUI4D - Jul 3, 11:50 UTCJul 3, 15:50 UTC4h 0m
2026-07-03 TUI23X - Jul 3, 07:10 UTCJul 3, 08:55 UTC1h 45m
2026-07-03 TUI2DJ - Jul 3, 04:15 UTCJul 3, 05:55 UTC1h 40m
2026-07-02 TUI2XA STR → STR Jul 2, 05:10 UTCJul 2, 19:35 UTC14h 25m
2026-07-01 TUI22H STR → STR Jul 1, 10:15 UTCJul 1, 20:05 UTC9h 50m
2026-06-30 TUI22H STR → STR Jun 30, 10:20 UTCJun 30, 11:55 UTC1h 35m
2026-06-30 TUI23X - Jun 30, 07:35 UTCJun 30, 09:10 UTC1h 35m
2026-06-30 TUI2DJ - Jun 30, 04:05 UTCJun 30, 05:50 UTC1h 45m
2026-06-29 TUI32H STR → STR Jun 29, 12:24 UTCJun 29, 21:50 UTC9h 25m
2026-06-29 TUI10D KGS → STR Jun 29, 08:24 UTCJun 29, 10:55 UTC2h 30m
2026-06-29 TUI68K STR → KGS Jun 29, 04:25 UTCJun 29, 07:05 UTC2h 40m

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

Mode-S 3C7421 frequently asked

What is Mode-S code 3C7421?
3C7421 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AMAA.
Where is Mode-S 3C7421 registered?
Mode-S code 3C7421 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C7421 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C7421, octal 17072041, decimal 3,961,889.
What flights does 3C7421 operate?
Mode-S 3C7421 has broadcast 20 distinct callsigns, including TUI23X, TUI2DJ, TUI68K, TUI10D, TUI4D.