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
Transponder active on ground
Flights observed
352
Distinct callsigns
20
Country
DE
Last broadcast
Jul 26, 21:10 UTC

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 TUIfly 25 2026-07-26
TUI2DJ TUIfly 23 2026-07-26
TUI68K TUIfly 18 2026-07-25
TUI10D TUIfly 18 2026-07-25
TUI4D TUIfly 17 2026-07-26
TUI32H TUIfly 15 2026-07-25
TUI8L - 12 2026-07-17
TUI2XA - 11 2026-07-23
TUI68M - 7 2026-07-22
TUI4YJ - 7 2026-07-04
TUI4CY - 7 2026-07-22
TUI60A - 6 2026-07-21
TUI50K TUIfly 6 2026-05-11
TUI3GA TUIfly 6 2026-05-15
TUI3C TUIfly 6 2026-05-10
TUI7GM TUIfly 5 2026-07-22
TUI7DG TUIfly 5 2026-07-22
TUI5ME TUIfly 5 2026-05-09
TUI5HJ TUIfly 5 2026-05-30
TUI8FG - 4 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TUI7TN LPA → FRA Jul 26, 17:15 UTCJul 26, 21:05 UTC3h 50m
2026-07-26 TUI4D STR → LPA Jul 26, 10:30 UTCJul 26, 14:00 UTC3h 30m
2026-07-26 TUI23X PMI → STR Jul 26, 07:15 UTCJul 26, 08:50 UTC1h 35m
2026-07-26 TUI2DJ STR → PMI Jul 26, 04:15 UTCJul 26, 05:55 UTC1h 40m
2026-07-25 TUI32H STR → FUE Jul 25, 12:15 UTCJul 25, 21:35 UTC9h 20m
2026-07-25 TUI10D KGS → STR Jul 25, 07:55 UTCJul 25, 10:40 UTC2h 45m
2026-07-25 TUI68K STR → KGS Jul 25, 04:05 UTCJul 25, 06:25 UTC2h 20m
2026-07-24 TUI4D STR → LPA Jul 24, 11:35 UTCJul 24, 21:00 UTC9h 25m
2026-07-24 TUI23X PMI → STR Jul 24, 07:15 UTCJul 24, 09:00 UTC1h 45m
2026-07-24 TUI2DJ STR → PMI Jul 24, 04:10 UTCJul 24, 05:45 UTC1h 35m
2026-07-23 TUI2XA STR → STR Jul 23, 05:00 UTCJul 23, 19:15 UTC14h 15m
2026-07-22 TUI7GM HER → STR Jul 22, 16:55 UTCJul 22, 19:35 UTC2h 40m
2026-07-22 TUI7DG STR → HER Jul 22, 13:10 UTCJul 22, 15:30 UTC2h 20m
2026-07-22 TUI68M - Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-22 TUI4CY - Jul 22, 04:35 UTCJul 22, 10:25 UTC5h 50m
2026-07-21 TUI60A STR → STR Jul 21, 10:05 UTCJul 21, 20:00 UTC9h 55m
2026-07-21 TUI23X PMI → STR Jul 21, 07:00 UTCJul 21, 08:40 UTC1h 40m
2026-07-21 TUI2DJ STR → PMI Jul 21, 04:05 UTCJul 21, 05:45 UTC1h 40m
2026-07-20 TUI32H STR → STR Jul 20, 12:15 UTCJul 20, 21:10 UTC8h 55m
2026-07-20 TUI10D KGS → STR Jul 20, 08:30 UTCJul 20, 11:10 UTC2h 40m
2026-07-20 TUI68K STR → KGS Jul 20, 04:15 UTCJul 20, 06:45 UTC2h 30m
2026-07-19 TUI4D STR → LPA Jul 19, 10:20 UTCJul 19, 19:40 UTC9h 20m
2026-07-19 TUI23X - Jul 19, 07:30 UTCJul 19, 09:00 UTC1h 30m
2026-07-19 TUI2DJ STR → PMI Jul 19, 04:15 UTCJul 19, 06:10 UTC1h 55m
2026-07-18 TUI32H STR → STR Jul 18, 12:15 UTCJul 18, 21:10 UTC8h 55m
2026-07-18 TUI10D KGS → STR Jul 18, 08:10 UTCJul 18, 10:50 UTC2h 40m
2026-07-18 TUI68K STR → KGS Jul 18, 04:05 UTCJul 18, 06:30 UTC2h 25m
2026-07-17 TUI8L - Jul 17, 17:55 UTCJul 17, 21:30 UTC3h 35m
2026-07-17 TUI4D - Jul 17, 11:39 UTCJul 17, 15:44 UTC4h 5m
2026-07-17 TUI23X - Jul 17, 07:20 UTCJul 17, 08:54 UTC1h 35m
2026-07-17 TUI2DJ STR → PMI Jul 17, 04:14 UTCJul 17, 06:15 UTC2h 0m
2026-07-16 TUI2XA STR → STR Jul 16, 05:05 UTCJul 16, 19:05 UTC14h 0m
2026-07-15 TUI7GM - Jul 15, 17:10 UTCJul 15, 20:00 UTC2h 50m
2026-07-15 TUI7DG - Jul 15, 13:10 UTCJul 15, 15:30 UTC2h 20m
2026-07-15 TUI68M RHO → STR Jul 15, 08:30 UTCJul 15, 11:35 UTC3h 5m
2026-07-15 TUI4CY STR → RHO Jul 15, 04:20 UTCJul 15, 06:55 UTC2h 35m
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

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?
Mode-S 3C7421 is currently broadcasting from the ground.
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.